Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
The beginning of May marks a shift in the average high-temperature, moving from April's mild 57°F (13.9°C) to an agreeable 68°F (20°C). May nights observe an average temperature dip to a chilly 48.7°F (9.3°C).Humidity
The average relative humidity in May is 80%.Rainfall
The month with the most rainfall is May, when the rain falls for 19.8 days and typically aggregates up to 2.56" (65mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. May is the last month it regularly snows. During 0.4 snowfall days, in May, Johnstown aggregates 0.2" (5mm) of snow. Throughout the year, there are 47.7 snowfall days, and 18.23" (463mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 26min.On the first day of May, sunrise is at 6:13 am and sunset at 8:11 pm. On the last day of the month, sunrise is at 5:47 am and sunset at 8:39 pm EDT.
Sunshine
In May, the average sunshine is 8.4h.UV index
May through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index reading of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 5 in May interprets into the following recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Johnstown in May?
What is the average humidity in May?
What is the rainiest month?
How many days does it rain in May?
What is the last month it snows?
What is the average length of the day in May?
What time are sunrise and sunset in May?
How long on average sun shines in May?
When is the highest UV index?
How high is the UV index in May?
Average temperature in May
Johnstown, PA
- Average high temperature in May: 68°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (30.7°F).
- Average low temperature in May: 48.7°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure in May
Johnstown, PA
- Average pressure in May: 30"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in May
Johnstown, PA
- Average wind speed in May: 7.2mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in May
Johnstown, PA
- Average humidity in May: 80%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is July (78%).
Average rainfall in May
Johnstown, PA
- Average rainfall in May: 2.56"
The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is November (1.1").
Average rainfall days in May
Johnstown, PA
- Average rainfall days in May: 19.8 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in May
Johnstown, PA
- Average snowfall in May: 0.2"
The month with the highest snowfall is March (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Johnstown, PA
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is January (12 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Johnstown, PA
- Average daylight in May: 14h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in May: 8h and 2min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).
Average sunshine days in May
Johnstown, PA
- Average sunshine days in May: 9 days
The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is May (9 days).
Average UV index in May
Johnstown, PA
- Average UV index in May: 5
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Johnstown, PA
- Average cloud cover in May: 49
The month with the most cloud cover is January (Cloud cover 72).
The month with the least cloud cover is August (Cloud cover 39).
Average visibility in May
Johnstown, PA
- Average visibility in May: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
Johnstown, Pennsylvania, USA
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