May weather forecast and climate
Simpson, MT

The last month of the spring, May, is an enjoyable month in Simpson, Montana, with temperature in the range of an average high of 64.6°F (18.1°C) and an average low of 46.2°F (7.9°C).

Temperature

In May, the average high-temperature increases, from a cool 53.2°F (11.8°C) in April, to a comfortable 64.6°F (18.1°C). The average low-temperature, in May, is 46.2°F (7.9°C).

Humidity

In May, the average relative humidity in Simpson is 53%.

Rainfall

In May, in Simpson, Montana, the rain falls for 13.8 days. Throughout May, 1.26" (32mm) of precipitation is accumulated. In Simpson, during the entire year, the rain falls for 98.7 days and collects up to 8.23" (209mm) of precipitation.

Snowfall

Months with snowfall in Simpson, Montana, are January through May, September through December. May is the last month it regularly snows in Simpson, Montana. During 0.7 snowfall days, Simpson aggregates 0.51" (13mm) of snow. In Simpson, during the entire year, snow falls for 53.5 days, and aggregates up to 14.25" (362mm) of snow.

Daylight

The average length of the day in Simpson is 15.3h.

Sunshine

The average sunshine in Simpson is 10.3h.

UV index

In Simpson, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 5 in May interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in May in Simpson?

In May, the average high-temperature is 64.6°F (18.1°C), and the average low-temperature is 46.2°F (7.9°C).

What is the average humidity in May in Simpson?

In May, the average relative humidity in Simpson, Montana, is 53%.

How many days does it rain in May in Simpson?

In Simpson, Montana, in May, it is raining for 13.8 days, with typically 1.26" (32mm) of accumulated precipitation.

What is the last month it snows in Simpson?

May is the last month it regularly snows in Simpson, Montana. During 0.7 snowfall days, in May, Simpson aggregates 0.51" (13mm) of snow.

How many hours of daylight does Simpson have in May?

In Simpson, the average length of the day in May is 15.3h.

How many hours of sunshine does Simpson have in May?

The average sunshine in May in Simpson is 10.3h.

What is the UV index intensity in May in Simpson?

In May, the average daily maximum UV index in Simpson is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from the exposure to the Sun's UV rays.
Average temperature in May - Simpson, MT
  • Average high temperature in May: 64.6°F

The warmest month (with the highest average high temperature) is July (82.8°F).
Months with the lowest average high temperature are January and December (27.1°F).

  • Average low temperature in May: 46.2°F

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is February (13.5°F).

Average pressure in May - Simpson, MT
  • Average pressure in May: 29.92"

Months with the highest atmospheric pressure are January and February (30.12").
The month with the lowest atmospheric pressure is June (29.84").

Average wind speed in May - Simpson, MT
  • Average wind speed in May: 9.7mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).

Average humidity in May - Simpson, MT
  • Average humidity in May: 53%

The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is August (40%).

Average rainfall in May - Simpson, MT
  • Average rainfall in May: 1.26"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is December (0.31").

Average rainfall days in May - Simpson, MT
  • Average rainfall days in May: 13.8 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is February (4 days).

Average snowfall in May - Simpson, MT
  • Average snowfall in May: 0.51"

The month with the highest snowfall is February (2.72").
Months with the least snowfall are June, July and August (0").

Average snowfall days in May - Simpson, MT
  • Average snowfall days in May: 0.7 days

The month with the highest number of snowfall days is February (11 days).
Months with the least snowfall days are June, July and August (0 days).

Average daylight in May / Average sunshine in May - Simpson, MT
  • Average daylight in May: 15.3h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in May: 10.3h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is February (Average sunshine: 5.3h).

Average sunshine days in May - Simpson, MT
  • Average sunshine days in May: 14.9 days

The month with the most sunshine days is September (20.3 days).
The month with the least sunshine days is April (12.8 days).

Average UV index in May - Simpson, MT
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in May - Simpson, MT
  • Average cloud cover in May: 32

The month with the most cloud cover is February (Cloud cover 46).
Months with the least cloud cover are July and August (Cloud cover 16).

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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).