Average Weather in January in Hamilton Montana, United States
Daily high temperatures increase by 3°F, from 30°F to 33°F, rarely falling below 19°F or exceeding 41°F.
Daily low temperatures increase by 2°F, from 18°F to 20°F, rarely falling below 2°F or exceeding 32°F.
For reference, on July 29, the hottest day of the year, temperatures in Hamilton typically range from 51°F to 84°F, while on December 22, the coldest day of the year, they range from 18°F to 30°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in January
The month of January in Hamilton experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 66% throughout the month. The highest chance of overcast or mostly cloudy conditions is 67% on January 10.
The clearest day of the month is January 30, with clear, mostly clear, or partly cloudy conditions 35% of the time.
For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on July 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.
Cloud Cover Categories in January
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Hamilton, the chance of a wet day over the course of January is gradually decreasing, starting the month at 24% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 36% on June 6, and its lowest chance is 14% on August 2.
Over the course of January in Hamilton, the chance of a day with only rain remains an essentially constant 9% throughout, the chance of a day with mixed snow and rain remains an essentially constant 6% throughout, and the chance of a day with only snow decreases from 10% to 7%.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Hamilton is essentially constant, remaining about 0.7 inches throughout, and rarely exceeding 1.8 inches or falling below 0.1 inches.
The lowest average 31-day accumulation is 0.7 inches on January 23.
Average Monthly Rainfall in January
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during January in Hamilton is essentially constant, remaining about 0.5 inches throughout, and rarely exceeding 1.4 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Hamilton, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 57 minutes, implying an average daily increase of 1 minute, 54 seconds, and weekly increase of 13 minutes, 17 seconds.
The shortest day of the month is January 1, with 8 hours, 41 minutes of daylight and the longest day is January 31, with 9 hours, 38 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Hamilton is 8:19 AM on January 2 and the earliest sunrise is 18 minutes earlier at 8:01 AM on January 31.
The earliest sunset is 5:00 PM on January 1 and the latest sunset is 39 minutes later at 5:39 PM on January 31.
Daylight saving time is observed in Hamilton during 2020, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 20, the longest day of the year, the Sun rises at 5:44 AM and sets 15 hours, 47 minutes later, at 9:32 PM, while on December 21, the shortest day of the year, it rises at 8:16 AM and sets 8 hours, 37 minutes later, at 4:53 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Hamilton is essentially constant during January, remaining around 0% throughout.
For reference, on July 26, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Hamilton is essentially constant during January, remaining within 0.1 miles per hour of 4.9 miles per hour throughout.
For reference, on January 10, the windiest day of the year, the daily average wind speed is 5.0 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 3.7 miles per hour.
The highest daily average wind speed during January is 5.0 miles per hour on January 17.
Average Wind Speed in January
The hourly average wind direction in Hamilton throughout January is predominantly from the south, with a peak proportion of 56% on January 7.
Wind Direction in January
The growing season in Hamilton typically lasts for 4.4 months (137 days), from around May 12 to around September 25, rarely starting before April 24 or after May 30, and rarely ending before September 5 or after October 15.
The month of January in Hamilton is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Hamilton are essentially constant during January, remaining around 0°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in Hamilton is gradually increasing during January, rising by 0.7 kWh, from 1.4 kWh to 2.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Hamilton are 46.247 deg latitude, -114.160 deg longitude, and 3,642 ft elevation.
The topography within 2 miles of Hamilton contains only modest variations in elevation, with a maximum elevation change of 348 feet and an average elevation above sea level of 3,604 feet. Within 10 miles contains only modest variations in elevation (5,722 feet). Within 50 miles also contains extreme variations in elevation (8,891 feet).
The area within 2 miles of Hamilton is covered by sparse vegetation (44%), cropland (23%), grassland (18%), and artificial surfaces (11%), within 10 miles by sparse vegetation (34%) and shrubs (22%), and within 50 miles by trees (52%) and shrubs (21%).
This report illustrates the typical weather in Hamilton year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Hamilton.
For each station, the records are corrected for the elevation difference between that station and Hamilton according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Hamilton is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Hamilton and a given station.
The stations contributing to this reconstruction are: Missoula International Airport (43%, 75 kilometers, north); Lowell (20%, 111 kilometers, west); Lemhi County Airport (20%, 128 kilometers, south); and Bert Mooney Airport (17%, 132 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .