Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
In Lewistown, Montana, the coldest period comes during February and December, when the average high-temperature touches 29.1°F (-1.6°C).Humidity
The average relative humidity in December is 77%.Rainfall
December is the month with the least rainfall in Lewistown, Montana. Rain falls for 6 days and accumulates 0.71" (18mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In Lewistown, in December, snow falls for 13.5 days, with typically accumulated 4.88" (124mm) of snow. Throughout the year, there are 83.4 snowfall days, and 45.51" (1156mm) of snow is accumulated.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year in Lewistown.On the first day of December, sunrise is at 7:43 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 8:03 am and sunset at 4:38 pm MST.
Sunshine
In Lewistown, the average sunshine in December is 5.6h.UV index
January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Lewistown, Montana. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A daily high UV index of 2 in December leads to these guidelines:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Frequently asked questions
What time of the year is the coldest in Lewistown?
How cold is December in Lewistown?
What is the average humidity in December in Lewistown?
What is the driest month in Lewistown?
How much does it rain in Lewistown in December?
How much does it snow in Lewistown in December?
What is the month with the shortest days in Lewistown?
How many hours of daylight does Lewistown have in December?
What time are sunrise and sunset in December in Lewistown?
How long on average sun shines in December in Lewistown?
What is the month with the lowest UV index in Lewistown?
What is the UV index intensity in December in Lewistown?
Average temperature in December
Lewistown, MT
- Average high temperature in December: 29.1°F
The warmest month (with the highest average high temperature) is July (78.8°F).
The months with the lowest average high temperature are February and December (29.1°F).
- Average low temperature in December: 16°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).
Average pressure in December
Lewistown, MT
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Lewistown, MT
- Average wind speed in December: 9.5mph
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).
Average humidity in December
Lewistown, MT
- Average humidity in December: 77%
The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).
Average rainfall in December
Lewistown, MT
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days in December
Lewistown, MT
- Average rainfall days in December: 6 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).
Average snowfall in December
Lewistown, MT
- Average snowfall in December: 4.88"
The month with the highest snowfall is April (9.13").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Lewistown, MT
- Average snowfall days in December: 13.5 days
The month with the highest number of snowfall days is February (15.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Lewistown, MT
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 5h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days in December
Lewistown, MT
- Average sunshine days in December: 16 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).
Average UV index in December
Lewistown, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in December
Lewistown, MT
- Average cloud cover in December: 41
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in December
Lewistown, MT
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Lewistown, Montana, USA
Weather forecast for your location
2. Allow the app to use your location