May weather forecast
Hamilton, MT

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A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore
A strong suspension bridge over a fast river in Hamilton, Montana, overlooking scenic trees and hilly landscapes over the other side of the shore

Weather in May

May signals the onset of warmer temperatures, an increase in daylight and sunshine hours, and a further decline in snowfall. Hinting at the arrival of summer, snowfall dwindles from 5.67" (144mm) in April to a bare minimum 0.67" (17mm). May emerges as warm, with consistent rainfall, providing an ideal climate for plant growth. With the creeping up of temperatures, Hamilton begins to welcome summertime during this month. Hamilton's residents and visitors can look forward to clearer skies and longer days, turning the city into a bustling hub of activities.

Temperature

May brings a temperature change, with average high-temperatures moving from April's frosty 43.5°F (6.4°C) to a moderate 56.7°F (13.7°C). Hamilton documents a substantial shift from daytime warmth, recording an average nighttime temperature of 33.4°F (0.8°C) in May.

Humidity

In Hamilton, the average relative humidity in May is 71%.

Rainfall

In Hamilton, in May, during 19.5 rainfall days, 1.97" (50mm) of precipitation is typically accumulated. Throughout the year, there are 163.6 rainfall days, and 20.83" (529mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. May is the last month it regularly snows. During 2.3 snowfall days, in May, Hamilton aggregates 0.67" (17mm) of snow. Throughout the year, there are 101.1 snowfall days, and 59.17" (1503mm) of snow is accumulated.

Daylight

In Hamilton, the average length of the day in May is 15h and 1min.
On the first day of the month, sunrise is at 6:21 am and sunset at 8:45 pm. On the last day of May, sunrise is at 5:48 am and sunset at 9:20 pm MDT.

Sunshine

In May, the average sunshine in Hamilton, Montana, is 10.4h.

UV index

The average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 4 in May interprets into the following advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.

Frequently asked questions

What is the temperature in May?

During May, Hamilton experiences an average high-temperature of 56.7°F (13.7°C) and a low-temperature of 33.4°F (0.8°C).

What is the average humidity in May in Hamilton?

The average relative humidity in May in Hamilton is 71%.

How much does it rain in May?

In Hamilton, in May, during 19.5 rainfall days, 1.97" (50mm) of precipitation is typically accumulated.

What is the last month it snows?

May is the last month it regularly snows. During 2.3 snowfall days, in May, Hamilton aggregates 0.67" (17mm) of snow.

What is the average length of the day in May?

In May, the average day length is 15h and 1min.

When is the sunrise / sunset in May?

On the first day of May, sunrise is at 6:21 am and sunset at 8:45 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 9:20 pm MDT.

How long on average sun shines in May?

In Hamilton, the average sunshine duration in May is 10.4h.

How high is the UV index in May?

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Hamilton, MT

Average temperature in May - Hamilton, MT
  • Average high temperature in May: 56.7°F

The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.8°F).

  • Average low temperature in May: 33.4°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (14°F).

Average pressure in May
Hamilton, MT

Average pressure in May - Hamilton, MT
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in May
Hamilton, MT

Average wind speed in May - Hamilton, MT
  • Average wind speed in May: 4.5mph

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

Average humidity in May
Hamilton, MT

Average humidity in May - Hamilton, MT
  • Average humidity in May: 71%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (50%).

Average rainfall in May
Hamilton, MT

Average rainfall in May - Hamilton, MT
  • Average rainfall in May: 1.97"

The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").

Average rainfall days in May
Hamilton, MT

Average rainfall days in May - Hamilton, MT
  • Average rainfall days in May: 19.5 days

The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is July (8 days).

Average snowfall in May
Hamilton, MT

Average snowfall in May - Hamilton, MT
  • Average snowfall in May: 0.67"

The month with the highest snowfall is February (13.03").
The months with the least snowfall are June, July and August (0").

Average snowfall days in May
Hamilton, MT

Average snowfall days in May - Hamilton, MT
  • Average snowfall days in May: 2.3 days

The month with the highest number of snowfall days is February (19.3 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in May /
Average sunshine in May
Hamilton, MT

Average daylight in May / Average sunshine in May - Hamilton, MT
  • Average daylight in May: 15h and 0min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in May: 10h and 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

Average sunshine days in May
Hamilton, MT

Average sunshine days in May - Hamilton, MT
  • Average sunshine days in May: 8.5 days

The month with the most sunshine days is July (18.9 days).
The month with the least sunshine days is February (5.6 days).

Average UV index in May
Hamilton, MT

Average UV index in May - Hamilton, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in May
Hamilton, MT

Average cloud cover in May - Hamilton, MT
  • Average cloud cover in May: 33

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 13).

Average visibility in May
Hamilton, MT

Average visibility in May - Hamilton, MT
  • Average visibility in May: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).

Hamilton, Montana, USA

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