December weather forecastBrockton, MT
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Brockton, Montana, with an average temperature fluctuating between 12.4°F (-10.9°C) and 24.6°F (-4.1°C).Temperature
The onset of December is marked by a decrease in temperature, transitioning from a wintry 38.7°F (3.7°C) in November to a freezing cold 24.6°F (-4.1°C). During December nights, Brockton witnesses a consistent average temperature of 12.4°F (-10.9°C).Humidity
The average relative humidity in December is 84%.Rainfall
In Brockton, in December, during 4.5 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Brockton, during the entire year, the rain falls for 95.7 days and collects up to 11.69" (297mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Brockton, Montana, in December, snow falls for 13.6 days, with typically accumulated 3.58" (91mm) of snow. In Brockton, Montana, during the entire year, snow falls for 63.4 days and aggregates up to 17.99" (457mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 24min of daylight.On the first day of the month, sunrise is at 7:29 am and sunset at 4:08 pm. On the last day of December, sunrise is at 7:49 am and sunset at 4:16 pm MST.
Sunshine
In December, the average sunshine in Brockton is 4.8h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high daily UV index of 1 during December translates into the following directions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Brockton, MT
- Average high temperature in December: 24.6°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is February (23°F).
- Average low temperature in December: 12.4°F
The month with the highest average low temperature is July (63.7°F).
The coldest months (with the lowest average low temperature) are January and February (10.2°F).
Average pressure in December
Brockton, MT
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is February (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).
Average wind speed in December
Brockton, MT
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is April (11.2mph).
The calmest month (with the lowest average wind speed) is February (8.8mph).
Average humidity in December
Brockton, MT
- Average humidity in December: 84%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (42%).
Average rainfall in December
Brockton, MT
- Average rainfall in December: 0.55"
The wettest month (with the highest rainfall) is May (1.89").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Brockton, MT
- Average rainfall days in December: 4.5 days
The month with the highest number of rainy days is May (13.1 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in December
Brockton, MT
- Average snowfall in December: 3.58"
The month with the highest snowfall is February (3.82").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Brockton, MT
- Average snowfall days in December: 13.6 days
The month with the highest number of snowfall days is December (13.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Brockton, MT
- Average daylight in December: 8h and 24min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in December: 4h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Brockton, MT
- Average sunshine days in December: 17.1 days
The month with the most sunshine days is September (21.4 days).
The month with the least sunshine days is April (13.8 days).
Average UV index in December
Brockton, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Brockton, MT
- Average cloud cover in December: 49
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in December
Brockton, 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).
