May weather forecast and climate
Hamilton, MT

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
The last month of the spring, May, is a moderate month in Hamilton, Montana, with temperature in the range of an average high of 56.7°F (13.7°C) and an average low of 33.4°F (0.8°C).

Temperature

In May, the average high-temperature rises, from a frosty 43.5°F (6.4°C) in April, to a mild 56.7°F (13.7°C). The average low-temperature, in Hamilton, is 33.4°F (0.8°C).

Humidity

The average relative humidity in Hamilton, Montana, is 71%.

Rainfall

In May, the rain falls for 19.5 days. Throughout May, 1.97" (50mm) of precipitation is accumulated. In Hamilton, during the entire year, the rain falls for 163.6 days and collects up to 20.83" (529mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in Hamilton is 15h.

Sunshine

The average sunshine in May is 10.4h.

UV index

In Hamilton, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 4 in May interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Hamilton?

In May, the average high-temperature is 56.7°F (13.7°C), and the average low-temperature is 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 Hamilton in May?

In May, the rain falls for 19.5 days. Throughout May, 1.97" (50mm) of precipitation is accumulated.

What is the last month it snows in Hamilton?

May is the last month it regularly snows in Hamilton. 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 Hamilton?

The average length of the day in May is 15h.

How many hours of sunshine does Hamilton have in May?

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

What is the UV index reading in May in Hamilton?

In Hamilton, Montana, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in May - Hamilton, MT
  • Average high temperature in May: 13.7°C

The warmest month (with the highest average high temperature) is July (25°C).
The month with the lowest average high temperature is December (-2.9°C).

  • Average low temperature in May: 0.8°C

The month with the highest average low temperature is August (8.3°C).
The coldest month (with the lowest average low temperature) is December (-10°C).

Average pressure in May - Hamilton, MT
  • Average pressure in May: 1014.6mbar

The month with the highest atmospheric pressure is January (1023mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in May - Hamilton, MT
  • Average wind speed in May: 7.2km/h

The windiest month (with the highest average wind speed) is January (8.6km/h).
The calmest month (with the lowest average wind speed) is August (6.6km/h).

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: 50mm

The wettest months (with the highest rainfall) are February and April (60mm).
The driest month (with the least rainfall) is August (19mm).

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: 17mm

The month with the highest snowfall is February (331mm).
Months with the least snowfall are June, July and August (0mm).

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).
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: 15h

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in May: 10.4h

Months with the most sunshine are July and August (Average sunshine: 11.7h).
Months with the least sunshine are January and December (Average sunshine: 5.4).

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: 4

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

Average visibility in May - Hamilton, MT
  • Average visibility in May: 9km

Months with the highest visibility are July and August (10km).
Months with the lowest visibility are January, February, March and December (7km).