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Winter Weather in Sidney Montana, United States

Daily high temperatures increase by 3°F, from 33°F to 37°F, rarely falling below 3°F or exceeding 55°F. The lowest daily average high temperature is 25°F on January 3.

Daily low temperatures are around 12°F, rarely falling below -16°F or exceeding 33°F. The lowest daily average low temperature is 7°F on January 3.

For reference, on July 27, the hottest day of the year, temperatures in Sidney typically range from 59°F to 87°F, while on January 2, the coldest day of the year, they range from 7°F to 25°F.

Average High and Low Temperature in the Winter in Sidney

Average High and Low Temperature in the Winter in SidneyDecJanFeb-20°F-20°F-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°FFallSpringJan 325°FJan 325°F7°F7°FDec 133°FDec 133°F15°F15°FFeb 2837°FFeb 2837°F17°F17°FFeb 129°FFeb 129°F10°F10°F
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 winter temperatures. 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 the Winter in Sidney

Average Hourly Temperature in the Winter in SidneyDecJanFeb12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringfrigidfrigidfreezingvery coldvery 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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Bayzhansay, Kazakhstan (6,154 miles away); Talghar, Kazakhstan (6,154 miles); and Jiayuguan, China (6,241 miles) are the far-away foreign places with temperatures most similar to Sidney (view comparison).

Compare Sidney to another city:

Clouds

The winter in Sidney experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 55% to 59%. The highest chance of overcast or mostly cloudy conditions is 61% on January 18.

The clearest day of the winter is December 1, with clear, mostly clear, or partly cloudy conditions 46% of the time.

For reference, on January 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 61%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 76%.

Cloud Cover Categories in the Winter in Sidney

Cloud Cover Categories in the Winter in SidneyDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpringJul 2976%Jul 2976%Dec 146%Dec 146%Feb 2841%Feb 2841%Jan 140%Jan 140%Feb 141%Feb 141%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 Sidney, the chance of a wet day over the course of the winter is essentially constant, remaining around 5% throughout.

For reference, the year's highest daily chance of a wet day is 31% on June 13, and its lowest chance is 4% on February 3.

Over the course of the winter in Sidney, the chance of a day with only rain remains an essentially constant 1% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 3% throughout.

Probability of Precipitation in the Winter in Sidney

Probability of Precipitation in the Winter in SidneyDecJanFeb0%0%1%1%2%2%3%3%4%4%5%5%6%6%7%7%8%8%9%9%10%10%FallSpringFeb 44%Feb 44%Dec 14%Dec 14%Feb 284%Feb 284%Jan 15%Jan 15%snowmixedrain
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 season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the winter in Sidney is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.4 inches or falling below -0.0 inches.

The lowest average 31-day accumulation is 0.0 inches on January 2.

Average Monthly Rainfall in the Winter in Sidney

Average Monthly Rainfall in the Winter in SidneyDecJanFeb0.0 in0.0 in0.2 in0.2 in0.4 in0.4 in0.6 in0.6 in0.8 in0.8 in1.0 in1.0 in1.2 in1.2 inFallSpringJan 20.0 inJan 20.0 inDec 10.1 inDec 10.1 inFeb 280.1 inFeb 280.1 inFeb 10.0 inFeb 10.0 in
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 the winter in Sidney is essentially constant, remaining about 0.1 inches throughout, and rarely exceeding 0.5 inches or falling below -0.0 inches.

The highest average 31-day liquid-equivalent accumulation is 0.2 inches on January 2.

Average Monthly Liquid-Equivalent Snowfall in the Winter in Sidney

Average Monthly Liquid-Equivalent Snowfall in the Winter in SidneyDecJanFeb0.0 in0.0 in0.1 in0.1 in0.2 in0.2 in0.3 in0.3 in0.4 in0.4 in0.5 in0.5 inFallSpringJan 20.2 inJan 20.2 inDec 10.1 inDec 10.1 inFeb 280.1 inFeb 280.1 inFeb 10.1 inFeb 10.1 in
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 the winter in Sidney, the length of the day is very rapidly increasing. From the start to the end of the season, the length of the day increases by 2 hours, 19 minutes, implying an average daily increase of 1 minute, 34 seconds, and weekly increase of 10 minutes, 57 seconds.

The shortest day of the winter is December 21, with 8 hours, 25 minutes of daylight and the longest day is February 28, with 11 hours, 1 minute of daylight.

Hours of Daylight and Twilight in the Winter in Sidney

Hours of Daylight and Twilight in the Winter in SidneyDecJanFeb0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrFallSpringDec 218 hr, 25 minDec 218 hr, 25 minnightnightdaydayFeb 2811 hr, 1 minFeb 2811 hr, 1 minFeb 19 hr, 34 minFeb 19 hr, 34 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 latest sunrise of the winter in Sidney is 7:45 AM on January 1 and the earliest sunrise is 1 hour, 6 minutes earlier at 6:38 AM on February 28.

The earliest sunset is 4:04 PM on December 11 and the latest sunset is 1 hour, 36 minutes later at 5:40 PM on February 28.

Daylight saving time is observed in Sidney during 2021, but it neither starts nor ends during the winter, so the entire season is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 4:58 AM and sets 16 hours, 0 minutes later, at 8:58 PM, while on December 21, the shortest day of the year, it rises at 7:42 AM and sets 8 hours, 25 minutes later, at 4:07 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in Sidney

Sunrise & Sunset with Twilight and Daylight Saving Time in the Winter in SidneyDecJanFeb12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMFallSpring6:38 AM6:38 AMFeb 285:40 PMFeb 285:40 PM7:35 AM7:35 AMDec 114:04 PMDec 114:04 PM7:45 AM7:45 AMJan 14:15 PMJan 14:15 PM7:23 AM7:23 AMFeb 14:57 PMFeb 14:57 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the winter. 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.

Moon

The figure below presents a compact representation of key lunar data for the winter of 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Winter in Sidney

Moon Rise, Set & Phases in the Winter in SidneyDecJanFeb12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMFallSpringNov 43:15 PMNov 43:15 PMNov 191:58 AMNov 191:58 AMDec 412:44 AMDec 412:44 AMDec 189:36 PMDec 189:36 PMJan 211:34 AMJan 211:34 AMJan 174:49 PMJan 174:49 PMJan 3110:47 PMJan 3110:47 PMFeb 169:57 AMFeb 169:57 AMMar 210:35 AMMar 210:35 AMMar 181:18 AMMar 181:18 AMApr 112:25 AMApr 112:25 AM7:19 AM7:19 AM7:26 AM7:26 AM8:03 AM8:03 AM4:22 PM4:22 PM8:04 AM8:04 AM4:03 PM4:03 PM4:06 PM4:06 PM4:10 PM4:10 PM4:09 PM4:09 PM7:33 AM7:33 AM7:04 AM7:04 AM5:46 PM5:46 PM6:30 PM6:30 PM7:37 AM7:37 AM6:56 PM6:56 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

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 Sidney is essentially constant during the winter, remaining around 0% throughout.

For reference, on July 17, the muggiest day of the year, there are muggy conditions 5% 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 the Winter in Sidney

Humidity Comfort Levels in the Winter in SidneyDecJanFeb0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%FallSpringDec 10%Dec 10%Feb 280%Feb 280%Jan 10%Jan 10%Feb 10%Feb 10%drydry
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 Sidney is essentially constant during the winter, remaining within 0.2 miles per hour of 11.6 miles per hour throughout.

For reference, on March 26, the windiest day of the year, the daily average wind speed is 12.0 miles per hour, while on July 31, the calmest day of the year, the daily average wind speed is 9.6 miles per hour.

Average Wind Speed in the Winter in Sidney

Average Wind Speed in the Winter in SidneyDecJanFeb0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphFallSpringDec 111.4 mphDec 111.4 mphFeb 2811.5 mphFeb 2811.5 mphJan 111.7 mphJan 111.7 mphFeb 111.7 mphFeb 111.7 mph
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 Sidney throughout the winter is predominantly from the west, with a peak proportion of 51% on December 22.

Wind Direction in the Winter in Sidney

Wind Direction in the Winter in SidneyDecJanFeb0%100%20%80%40%60%60%40%80%20%100%0%FallSpringwestsoutheastnorth
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 Sidney typically lasts for 4.5 months (139 days), from around May 11 to around September 27, rarely starting before April 23 or after May 28, and rarely ending before September 8 or after October 16.

The winter in Sidney is reliably fully outside of the growing season.

Time Spent in Various Temperature Bands and the Growing Season in the Winter in Sidney

Time Spent in Various Temperature Bands and the Growing Season in the Winter in SidneyDecJanFeb0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%FallSpring0%Jan 150%Jan 15frigidfreezingvery coldcoldcool
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 Sidney are very rapidly decreasing during the winter, decreasing by 2,506°F, from 2,509°F to 3°F, over the course of the season.

Growing Degree Days in the Winter in Sidney

Growing Degree Days in the Winter in SidneyDecJanFeb0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FFallSpringDec 12,509°FDec 12,509°FFeb 273°FFeb 273°FJan 10°FJan 10°F
The average growing degree days accumulated over the course of the winter, 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 Sidney is rapidly increasing during the winter, rising by 1.6 kWh, from 1.4 kWh to 3.1 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the winter is 1.3 kWh on December 22.

Average Daily Incident Shortwave Solar Energy in the Winter in Sidney

Average Daily Incident Shortwave Solar Energy in the Winter in SidneyDecJanFeb0.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWh5.5 kWh5.5 kWh6.0 kWh6.0 kWhFallSpringDec 221.3 kWhDec 221.3 kWhDec 11.4 kWhDec 11.4 kWhFeb 283.1 kWhFeb 283.1 kWhFeb 12.0 kWhFeb 12.0 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 Sidney are 47.717 deg latitude, -104.156 deg longitude, and 1,946 ft elevation.

The topography within 2 miles of Sidney contains only modest variations in elevation, with a maximum elevation change of 230 feet and an average elevation above sea level of 1,940 feet. Within 10 miles contains only modest variations in elevation (778 feet). Within 50 miles contains significant variations in elevation (1,335 feet).

The area within 2 miles of Sidney is covered by cropland (77%), artificial surfaces (12%), and grassland (11%), within 10 miles by grassland (70%) and cropland (27%), and within 50 miles by grassland (73%) and cropland (25%).

Data Sources

This report illustrates the typical weather in Sidney, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Sidney.

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

The stations contributing to this reconstruction are: Sidney-Richland Municipal Airport (KSDY, 99%, 2.0 kilometers, west); Sloulin Field International Airport (KISN, 0.6%, 64 kilometers, northeast); and Watford City Municipal Airport (KS25, 0.6%, 68 kilometers, east).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.