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
December is the coldest month of the year, registering average temperatures as high as 26.6°F (-3°C) and as low as 12.6°F (-10.8°C).Humidity
In December, the average relative humidity in Helmville is 88%.Rainfall
In December, the rain falls for 8.8 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. Throughout the year, in Helmville, there are 114.8 rainfall days, and 12.13" (308mm) of precipitation is accumulated.Snowfall
Months with snowfall in Helmville, Montana, are January through June, September through December. In Helmville, in December, during 15.5 snowfall days, 6.14" (156mm) of snow is typically accumulated. In Helmville, during the entire year, snow falls for 86.9 days and aggregates up to 39.96" (1015mm) of snow.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year in Helmville, Montana.On the first day of December in Helmville, Montana, sunrise is at 7:57 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 8:16 am and sunset at 4:53 pm MST.
Sunshine
January and December, with an average of 5.6h of sunshine, are months with the least sunshine in Helmville.UV index
In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 2 in December translates into these instructions:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Helmville?
How cold is it in Helmville in December?
What is the average humidity in December in Helmville?
How much does it rain in Helmville in December?
How many days does it snow in December in Helmville?
What is the month with the shortest days in Helmville?
What is the average length of the day in December in Helmville?
When are sunrise and sunset in December in Helmville?
What are the months with the least sunshine in Helmville?
How many hours of sunshine does Helmville have in December?
What is the UV index intensity in December in Helmville?
Average temperature in December
Helmville, MT
- Average high temperature in December: 26.6°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is December (26.6°F).
- Average low temperature in December: 12.6°F
The month with the highest average low temperature is August (46.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in December
Helmville, MT
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Helmville, MT
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Helmville, MT
- Average humidity in December: 88%
The months with the highest relative humidity are January and February (89%).
The months with the lowest relative humidity are July and August (49%).
Average rainfall in December
Helmville, MT
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is June (1.81").
The driest months (with the least rainfall) are August, September and October (0.59").
Average rainfall days in December
Helmville, MT
- Average rainfall days in December: 8.8 days
The month with the highest number of rainy days is June (13.3 days).
The month with the least rainy days is November (6.5 days).
Average snowfall in December
Helmville, MT
- Average snowfall in December: 6.14"
The month with the highest snowfall is February (9.76").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Helmville, MT
- Average snowfall days in December: 15.5 days
The month with the highest number of snowfall days is February (18.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Helmville, 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 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in December
Helmville, MT
- Average sunshine days in December: 14.6 days
The month with the most sunshine days is September (21.9 days).
The month with the least sunshine days is February (8.5 days).
Average UV index in December
Helmville, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in December
Helmville, MT
- Average cloud cover in December: 46
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Helmville, MT
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Helmville, Montana, USA
Weather forecast for your location
2. Allow the app to use your location