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Average Weather in December in Warm Springs Montana, United States

Daily high temperatures decrease by 5°F, from 34°F to 29°F, rarely falling below 15°F or exceeding 46°F. The lowest daily average high temperature is 29°F on December 29.

Daily low temperatures decrease by 5°F, from 18°F to 13°F, rarely falling below -6°F or exceeding 33°F. The lowest daily average low temperature is 13°F on December 30.

For reference, on July 27, the hottest day of the year, temperatures in Warm Springs typically range from 50°F to 82°F, while on December 30, the coldest day of the year, they range from 13°F to 29°F.

Average High and Low Temperature in December

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on December. 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 December

Average Hourly Temperature in December in Warm Springs18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMNovJanfreezingvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Koprivshtitsa, Bulgaria (5,767 miles away) and Kale, Turkey (6,285 miles) are the far-away foreign places with temperatures most similar to Warm Springs (view comparison).

Clouds

The month of December in Warm Springs experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 60% throughout the month.

The clearest day of the month is December 4, with clear, mostly clear, or partly cloudy conditions 41% of the time.

For reference, on March 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 63%, while on July 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.

Cloud Cover Categories in December

Cloud Cover Categories in December in Warm Springs1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 141%Dec 141%Dec 3139%Dec 3139%Dec 1141%Dec 1141%Dec 2141%Dec 2141%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Warm Springs, the chance of a wet day over the course of December is gradually decreasing, starting the month at 12% and ending it at 10%.

For reference, the year's highest daily chance of a wet day is 37% on June 7, and its lowest chance is 7% on January 22.

Over the course of December in Warm Springs, the chance of a day with only rain decreases from 5% to 3%, the chance of a day with mixed snow and rain remains an essentially constant 2% throughout, and the chance of a day with only snow remains an essentially constant 5% throughout.

Probability of Precipitation in December

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in Warm Springs is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.7 inches.

Average Monthly Rainfall in December

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

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 December in Warm Springs is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.7 inches or falling to 0.0 inches.

The highest average 31-day liquid-equivalent accumulation is 0.2 inches on December 17.

Average Monthly Liquid-Equivalent Snowfall in December

The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

Over the course of December in Warm Springs, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 37 minutes of daylight and the longest day is December 1, with 8 hours, 54 minutes of daylight.

Hours of Daylight and Twilight in December

Hours of Daylight and Twilight in December in Warm Springs1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 218 hr, 37 minDec 218 hr, 37 minnightnightdaydayDec 18 hr, 54 minDec 18 hr, 54 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Warm Springs is 7:53 AM on December 1 and the latest sunrise is 20 minutes later at 8:13 AM on December 31.

The earliest sunset is 4:45 PM on December 10 and the latest sunset is 10 minutes later at 4:54 PM on December 31.

Daylight saving time is observed in Warm Springs during 2018, but it neither starts nor ends during December, so the entire month is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:39 AM and sets 15 hours, 47 minutes later, at 9:26 PM, while on December 21, the shortest day of the year, it rises at 8:10 AM and sets 8 hours, 37 minutes later, at 4:47 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in December

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Warm Springs1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031312 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan7:53 AM7:53 AMDec 14:46 PMDec 14:46 PM8:13 AM8:13 AMDec 314:54 PMDec 314:54 PM8:07 AM8:07 AMDec 164:45 PMDec 164:45 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Warm Springs is essentially constant during December, remaining around 0% throughout.

Humidity Comfort Levels in December

dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Warm Springs is essentially constant during December, remaining within 0.1 miles per hour of 6.6 miles per hour throughout.

For reference, on January 16, the windiest day of the year, the daily average wind speed is 6.8 miles per hour, while on August 3, the calmest day of the year, the daily average wind speed is 4.4 miles per hour.

Average Wind Speed in December

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Warm Springs throughout December is predominantly from the west, with a peak proportion of 68% on December 26.

Wind Direction in December

Wind Direction in December in Warm Springs1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestsoutheastnorth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Warm Springs typically lasts for 3.7 months (115 days), from around May 24 to around September 15, rarely starting before May 1 or after June 14, and rarely ending before August 29 or after October 3.

The month of December in Warm Springs is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in December

Time Spent in Various Temperature Bands and the Growing Season in December in Warm Springs1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan-0%Dec 16-0%Dec 160%Nov 290%Nov 29frigidfreezingvery coldcold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Warm Springs are essentially constant during December, remaining around 1,627°F throughout.

Growing Degree Days in December

The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Warm Springs is essentially constant during December, remaining within 0.1 kWh of 1.6 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 1.5 kWh on December 25.

Average Daily Incident Shortwave Solar Energy in December

Average Daily Incident Shortwave Solar Energy in December in Warm Springs1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWhNovJanDec 251.5 kWhDec 251.5 kWhDec 11.6 kWhDec 11.6 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Warm Springs are 46.181 deg latitude, -112.785 deg longitude, and 4,875 ft elevation.

The topography within 2 miles of Warm Springs contains significant variations in elevation, with a maximum elevation change of 535 feet and an average elevation above sea level of 4,857 feet. Within 10 miles contains significant variations in elevation (2,871 feet). Within 50 miles contains large variations in elevation (7,402 feet).

The area within 2 miles of Warm Springs is covered by sparse vegetation (48%), grassland (23%), and shrubs (16%), within 10 miles by sparse vegetation (36%) and shrubs (22%), and within 50 miles by trees (40%) and shrubs (21%).

Data Sources

This report illustrates the typical weather in Warm Springs 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 Warm Springs.

For each station, the records are corrected for the elevation difference between that station and Warm Springs 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 Warm Springs is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Warm Springs and a given station.

The stations contributing to this reconstruction are: Bert Mooney Airport (63%, 33 kilometers, southeast); Helena Regional Airport (19%, 79 kilometers, northeast); Missoula International Airport (9%, 130 kilometers, northwest); and Lemhi County Airport (8%, 146 kilometers, southwest).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.