May weather forecast and climate
Lewistown, MT

Weather in May

May, the last month of the spring, in Lewistown, is a mild month, with average temperature ranging between max 58.5°F (14.7°C) and min 40.1°F (4.5°C).

Temperature

In Lewistown, the average high-temperature in May increases, from a chilly 47.8°F (8.8°C) in April, to a moderate 58.5°F (14.7°C). The average low-temperature, in May, is 40.1°F (4.5°C).

Humidity

In May, the average relative humidity in Lewistown is 65%.

Rainfall

The month with the most rainfall is May when the rain falls for 19.3 days and typically aggregates up to 3.39" (86mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall. In May, it is snowing for 2.4 days. Throughout May, 2.48" (63mm) of snow is accumulated. Throughout the year, in Lewistown, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.

Daylight

The average length of the day in May is 15.1h.

Sunshine

In Lewistown, the average sunshine is 10h.

UV index

In Lewistown, Montana, the average daily maximum UV index in May is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 4 in May transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in May in Lewistown?

In May, the average relative humidity is 65%.

What is the wettest month in Lewistown?

The month with the most rainfall in Lewistown is May when the rain falls for 19.3 days and typically aggregates up to 3.39" (86mm) of precipitation.

How many days does it rain in May in Lewistown?

In Lewistown, in May, it is raining for 19.3 days, with typically 3.39" (86mm) of accumulated precipitation.

How many days does it snow in May in Lewistown?

In May, in Lewistown, it is snowing for 2.4 days. Throughout May, 2.48" (63mm) of snow is accumulated.

What is the average length of the day in May in Lewistown?

In May, the average length of the day is 15.1h.

How long on average sun shines in May in Lewistown?

The average sunshine in May in Lewistown is 10h.

What is the UV index intensity in May in Lewistown?

In Lewistown, the average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in May
Lewistown, MT

Average temperature in May - Lewistown, MT
  • Average high temperature in May: 58.5°F

The warmest month (with the highest average high temperature) is July (78.8°F).
Months with the lowest average high temperature are February and December (29.1°F).

  • Average low temperature in May: 40.1°F

The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

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Average pressure in May
Lewistown, MT

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

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in May
Lewistown, MT

Average wind speed in May - Lewistown, MT
  • Average wind speed in May: 8.8mph

The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average humidity in May
Lewistown, MT

Average humidity in May - Lewistown, MT
  • Average humidity in May: 65%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in May
Lewistown, MT

Average rainfall in May - Lewistown, MT
  • Average rainfall in May: 3.39"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days in May
Lewistown, MT

Average rainfall days in May - Lewistown, MT
  • Average rainfall days in May: 19.3 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

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Average snowfall in May
Lewistown, MT

Average snowfall in May - Lewistown, MT
  • Average snowfall in May: 2.48"

The month with the highest snowfall is April (9.13").
Months with the least snowfall are July and August (0").

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Average snowfall days in May
Lewistown, MT

Average snowfall days in May - Lewistown, MT
  • Average snowfall days in May: 2.4 days

The month with the highest number of snowfall days is February (15.2 days).
Months with the least snowfall days are July and August (0 days).

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

Average daylight in May / Average sunshine in May - Lewistown, MT
  • Average daylight in May: 15.1h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in May: 10h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.5h).

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Average sunshine days in May
Lewistown, MT

Average sunshine days in May - Lewistown, MT
  • Average sunshine days in May: 8.9 days

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

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Average UV index in May
Lewistown, MT

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

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

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Average cloud cover in May
Lewistown, MT

Average cloud cover in May - Lewistown, MT
  • Average cloud cover in May: 36

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).

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Average visibility in May
Lewistown, MT

Average visibility in May - Lewistown, 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).

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