December weather forecastHamilton, MT
December
Weather in December
Finally rounding off the year, December in Hamilton is marked by a heavy drop in temperatures, the advent of more snowfall, and a noticeable decrease in daylight hours. The snowfall increases significantly from November's 6.18" (157mm) to December's 10.55" (268mm). As the heart of winter, it creates a magical holiday season with its snowy landscapes and frosted trees. Despite the decrease in sunshine hours and daylight, December’s weather brings with it an entirely different charm - a white winter heralding the end of the year and the beginning of new hopes for the next.Temperature
Hamilton's temperature records reveal December as the coldest month, marked by average highs of 26.8°F (-2.9°C) and lows of 14°F (-10°C).Humidity
In Hamilton, the average relative humidity in December is 87%.Rainfall
In Hamilton, Montana, during December, the rain falls for 12.9 days and regularly aggregates up to 1.97" (50mm) of precipitation. Throughout the year, there are 163.6 rainfall days, and 20.83" (529mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. In December, it is snowing for 18.6 days. Throughout December, 10.55" (268mm) of snow is accumulated. Throughout the year, there are 101.1 snowfall days, and 59.17" (1503mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:59 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 8:19 am and sunset at 5:00 pm MST.
Sunshine
The months with the least sunshine are January and December, with an average of 5.4h of sunshine.UV index
The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The average daily UV index of 1 in December transforms into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Hamilton, MT
- Average high temperature in December: 26.8°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.8°F).
- Average low temperature in December: 14°F
The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (14°F).
Average pressure in December
Hamilton, MT
- Average pressure in December: 30.19"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Hamilton, MT
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in December
Hamilton, MT
- Average humidity in December: 87%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (50%).
Average rainfall in December
Hamilton, MT
- Average rainfall in December: 1.97"
The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").
Average rainfall days in December
Hamilton, MT
- Average rainfall days in December: 12.9 days
The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is July (8 days).
Average snowfall in December
Hamilton, MT
- Average snowfall in December: 10.55"
The month with the highest snowfall is February (13.03").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Hamilton, MT
- Average snowfall days in December: 18.6 days
The month with the highest number of snowfall days is February (19.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Hamilton, MT
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 24min
The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in December
Hamilton, MT
- Average sunshine days in December: 10 days
The month with the most sunshine days is July (18.9 days).
The month with the least sunshine days is February (5.6 days).
Average UV index in December
Hamilton, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Hamilton, MT
- Average cloud cover in December: 48
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Hamilton, 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, March and December (4mi).
