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Contents
- The climate of Gresham
- The best time to visit Gresham
- The worst time to visit Gresham
- Spring weather in Gresham
- Summer weather in Gresham
- Autumn weather in Gresham
- Winter weather in Gresham
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The fall colors in the trees and the fields around a beautiful house in Gresham, Oregon
The climate of Gresham
Gresham, nestled in Oregon, USA, is classified under the Köppen climate system as a Mediterranean climate with warm summers, noted as Csb. Throughout the year, the city witnesses significant variations in temperature, precipitation levels, humidity, and wind speed. An average maximum temperature range from 45.3°F (7.4°C) in January to a soaring 80.4°F (26.9°C) in the month of August has been noted. The minimum temperature shows a less drastic jump during the same period, starting at 34.5°F (1.4°C) in January, and gradually increasing to a still mild 53.4°F (11.9°C) in August.
Rainfall in Gresham is primarily noted during the winter months, with the highest average precipitation of 5.31" (135mm) falling in December. The city experiences reduced rainfall between May and September, where average rainfall dips as low as 0.31" (8mm) in July. Hand-in-hand with rainfall is humidity, which remains relatively high throughout the year. The least humid month is July, with a relative humidity of 65%, while in January and February an elevated humidity level of over 80% is noticed.
It is important to discuss the unique attribute of Gresham’s climatological profile - snowfall. The snow in Gresham is sporadic, but does make an appearance in the winter months, with the highest average snowfall of 1.73" (44mm) falling in March. Months from May to October, however, do not experience any snowfall. In terms of sunshine, the city gets the least sun in February and December with only 4.2 hours a day, whereas the longest sunny days are between May and August, culminating at 10.9 hours a day.
Rainfall in Gresham is primarily noted during the winter months, with the highest average precipitation of 5.31" (135mm) falling in December. The city experiences reduced rainfall between May and September, where average rainfall dips as low as 0.31" (8mm) in July. Hand-in-hand with rainfall is humidity, which remains relatively high throughout the year. The least humid month is July, with a relative humidity of 65%, while in January and February an elevated humidity level of over 80% is noticed.
It is important to discuss the unique attribute of Gresham’s climatological profile - snowfall. The snow in Gresham is sporadic, but does make an appearance in the winter months, with the highest average snowfall of 1.73" (44mm) falling in March. Months from May to October, however, do not experience any snowfall. In terms of sunshine, the city gets the least sun in February and December with only 4.2 hours a day, whereas the longest sunny days are between May and August, culminating at 10.9 hours a day.
The best time to visit Gresham
The ideal time to visit Gresham lies between late spring and early autumn, influenced significantly by maximizing pleasant climatic conditions. May offers an idyllic combination of warmth with average high temperatures of 66.2°F (19°C) and moderate rainfall; making it an opportune time to explore the city’s outdoor attractions. The inviting weather continues throughout the summer, with August boasting the warmest weather, reaching an average high of 80.4°F (26.9°C), coupled with meager rainfall.
The worst time to visit Gresham
Winter months tend to present more challenging weather conditions in Gresham. From December to February, Gresham residents brave colder temperatures, zigzagging from 34.5°F (1.4°C) to 46.6°F (8.1°C), and heavy rainfall peaking at 5.31" (135mm) in December. Furthermore, higher humidity of upwards to 84% adds an extra layer of fen to the already chilly ambiance.
Spring weather in Gresham
Spring in Gresham is an enticing time with temperatures progressively warming and rainfall gradually decreasing. March introduces spring with an average high of 51.6°F (10.9°C) and an average low of 37.4°F (3°C). However, this warming trend prompts an increase in rainfall to 3.82" (97mm). More sunshine graces the city as spring advances, with 7.6 hrs of sunny spells in April, further increasing to a charming 8.8 hrs by May.
Summer weather in Gresham
Summer is welcomed with open arms in Gresham, bringing long sunny days and warm yet bearable temperatures. June presents a comfortable warmth with a high of 71.2°F (21.8°C) and low of 46.9°F (8.3°C). Peak warmth arrives in August with the mercury rising to the average high of 80.4°F (26.9°C). Humidity decreases to 64% and rainfall is scant, making it the driest month of the year.
Autumn weather in Gresham
Autumn brings noticeable transition to Gresham's weather. Temperatures begin to retreat in September, with highs averaging at 73°F (22.8°C) and lows at 50.2°F (10.1°C). Rainfall steadily increases during this season, with November witnessing an average precipitation of 3.82" (97mm). Sunshine dwindles to 4.7 hours a day by November, indicating the start of the darker winter days.
Winter weather in Gresham
Winter is characterized by colder temperatures and increased precipitation in Gresham. Average high temperatures plummet to a chilling 45.3°F (7.4°C) in January, whereas lows fall further to 34.5°F (1.4°C). December is the wettest month, with rainfall reaching a hefty 5.31" (135mm) on average. On rare occasions, snow decorates the city, peaking at 0.67" (17mm) in December. Despite short days, with December sunlight clocking in at 4.3 hours a day, Gresham's winter is brightened significantly by December festivities.
Weather in January
January in Gresham, Oregon, introduces the year with chilly temperatures as winter is in full swing. The city experiences average high temperatures of 45.3°F (7.4°C) and lows plunging to 34.5°F (1.4°C), the coldest among all twelve months. Weather in January »
Weather in February
The weather in Gresham starts to shift in February as the first hints of spring approach. Gresham tends to experience a relative humidity of 84% in February, the highest value throughout the year, creating a damp environment. This month marks the end of winter, yet the city continues to experience bouts of rainfall, making days notably damp. Weather in February »
Weather in March
March proposes a considerable change in weather, with temperatures beginning to rise and sunlight hours stretching out. Interestingly, the city observes 1.73" (44mm) of snowfall in March, despite increasing temperatures. March experiences more daylight hours, a sign of spring's arrival. Weather in March »
Weather in April
April marks the true beginning of spring in Gresham, characterized by longer daylight hours and increased sunshine. It is noteworthy that April sees the first month with no snowfall, a sign that winter has officially ended. Days become longer, landscapes become greener, and flowers start to bloom, reinforcing the beauty of this city. Weather in April »
Weather in May
The month of May brings a refreshing change to Gresham’s weather with warmer temperatures and the onset of the dry season. This month sees the city's lowest precipitation, down to 1.85" (47mm) compared to April's 3.27" (83mm). With a decrease in rainfall, May ushers in dryer and sunnier weather, paving the way for the summer months. Weather in May »
Weather in June
Gresham embraces the full arrival of summer in June. This month reports an average UV index of 5, the highest value throughout the year, indicating long sunny days fitting for outdoor activities. Vibrant summer days characterize June, with an average temperature increase pronounced especially in the late afternoons. Weather in June »
Weather in July
July is the pinnacle of summer in Gresham, noted for its hot temperatures and bright, sunny days. An impressive rise in temperature to a high of 79.3°F (26.3°C) is observed, making it the hottest month of the year. This period in the city is utmost suitable for recreational activities as the days are long and full of sunshine. Weather in July »
Weather in August
August's weather in Gresham remains fairly similar to July, maintaining summer's heat and brightness. With the highest recorded temperature averaging 80.4°F (26.9°C), these warm days are a continuation of July's scorching summer. Weather in August »
Weather in September
In September, Gresham begins to experience a hint of autumn as temperatures start to gradually decrease. Following the heat of August, September observes a notable change with temperatures dropping back to an average high of 73°F (22.8°C). Weather in September »
Weather in October
October’s weather in Gresham witnesses the city fully transitioning into autumn. The temperature difference between October and September, dropping from an average of 73°F (22.8°C) to 61°F (16.1°C), is quite noticeable. Cooler weather starts to manifest in the city with the arrival of frequent rain showers. Weather in October »
Weather in November
As November rolls into Gresham, the chill of the upcoming winter becomes more apparent. With an average rainfall of 3.82" (97mm), it outdoes October's 3.7" (94mm), declaring the arrival of the city's rainiest season. This month sees short days and long, cold nights as winter starts asserting its presence. Weather in November »
Weather in December
December in Gresham brings the onset of winter with cold temperatures, substantial rainfall, and short daylight hours. It's worth noting that with 5.31" (135mm), December sees the highest monthly average rainfall of the year. The city bids farewell to the year under cold winter skies and occasional rain showers. Weather in December »
Updated: Jun 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How much does it rain?
Throughout the year, there are 165.6 rainfall days, and 34.65" (880mm) of precipitation is accumulated.
When does it snow?
January through March, November and December are months with snowfall.
How much does it snow in Gresham?
Throughout the year, in Gresham, there are 8.2 snowfall days, and 5.87" (149mm) of snow is accumulated.
What is the month with the least sunshine?
The months with the least sunshine are January and February, with an average of 4.2h of sunshine.
What are the months with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the most humid month?
The most humid month is February, with an average relative humidity of 84%.
When does it snow the most?
The month with the most snowfall is March, when snow falls for 1.7 days and typically aggregates up to 1.73" (44mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
When it does not snow?
April through October are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 36min of daylight.
What is the driest month?
July is the month with the least rainfall. Rain falls for 4.9 days and accumulates 0.31" (8mm) of precipitation.
What are the months with the most sunshine?
July and August, with an average of 10.9h of sunshine, are months with the most sunshine.
When is the highest UV index?
July is the month with the highest UV index, with an average maximum UV index of 6.
What part of the year is the hottest?
August, recognised by an average high temperature of 80.4°F (26.9°C) and a low of 53.4°F (11.9°C), is Gresham's warmest month.
What is the least humid month?
The least humid month is August, with an average relative humidity of 64%.
What time of the year is the coldest?
December, with average temperatures reaching a high of 43.7°F (6.5°C) and a low of 33.8°F (1°C), is the coldest month.
What is the rainiest month?
December is the month with the most rainfall. Rain falls for 17.6 days and accumulates 5.31" (135mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 8h and 48min of daylight.
Average temperature
Gresham, OR
The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (43.7°F).
The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is December (33.8°F).
Average pressure
Gresham, OR
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30.03"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed
Gresham, OR
- Average wind speed in January:
6.8mph - Average wind speed in February:
6.2mph - Average wind speed in March:
5.6mph - Average wind speed in April:
5mph - Average wind speed in May:
4.2mph - Average wind speed in June:
4mph
- Average wind speed in July:
3.7mph - Average wind speed in August:
3.5mph - Average wind speed in September:
4mph - Average wind speed in October:
4.9mph - Average wind speed in November:
6.2mph - Average wind speed in December:
6.3mph
The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity
Gresham, OR
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).
Average rainfall
Gresham, OR
- Average rainfall in January:
4.96" - Average rainfall in February:
3.74" - Average rainfall in March:
3.82" - Average rainfall in April:
3.27" - Average rainfall in May:
1.85" - Average rainfall in June:
1.61"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.39" - Average rainfall in September:
1.85" - Average rainfall in October:
3.7" - Average rainfall in November:
3.82" - Average rainfall in December:
5.31"
The wettest month (with the highest rainfall) is December (5.31").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days
Gresham, OR
- Average rainfall days in January:
18.1 days - Average rainfall days in February:
16.1 days - Average rainfall days in March:
19.3 days - Average rainfall days in April:
17.6 days - Average rainfall days in May:
13.5 days - Average rainfall days in June:
10.9 days
- Average rainfall days in July:
4.9 days - Average rainfall days in August:
4.4 days - Average rainfall days in September:
9.7 days - Average rainfall days in October:
15 days - Average rainfall days in November:
18.5 days - Average rainfall days in December:
17.6 days
The month with the highest number of rainy days is March (19.3 days).
The month with the least rainy days is August (4.4 days).
Average snowfall
Gresham, OR
The month with the highest snowfall is March (1.73").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Gresham, OR
- Average snowfall days in January:
1.5 days - Average snowfall days in February:
2.8 days - Average snowfall days in March:
1.7 days - Average snowfall days in April:
0.3 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.7 days - Average snowfall days in December:
1.2 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Gresham, OR
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 5min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 1min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 5min - Average sunshine in June:
9h and 2min
- Average sunshine in July:
10h and 5min - Average sunshine in August:
10h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 3min - Average sunshine in November:
4h and 4min - Average sunshine in December:
4h and 2min
The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The months with the least sunshine are January and February (Average sunshine: 4h and 12min).
Average sunshine days
Gresham, OR
- Average sunshine days in January:
11.6 days - Average sunshine days in February:
9.7 days - Average sunshine days in March:
10.1 days - Average sunshine days in April:
10.3 days - Average sunshine days in May:
15.8 days - Average sunshine days in June:
17.3 days
- Average sunshine days in July:
25 days - Average sunshine days in August:
24.6 days - Average sunshine days in September:
18.5 days - Average sunshine days in October:
15.2 days - Average sunshine days in November:
10.5 days - Average sunshine days in December:
11.5 days
The month with the most sunshine days is July (25 days).
The month with the least sunshine days is February (9.7 days).
Average UV index
Gresham, OR
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Gresham, OR
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 24).
Average visibility
Gresham, OR
The months with the highest visibility are August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, November and December (5mi).
Gresham, Oregon, USA
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