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Average Weather at Gillette-Campbell County Airport Wyoming, United States

At Gillette-Campbell County Airport, the summers are short, warm, and mostly clear; the winters are freezing, windy, and partly cloudy; and it is dry year round. Over the course of the year, the temperature typically varies from 14°F to 87°F and is rarely below -6°F or above 97°F.

Climate Summary

very coldcoldcoolwarmhotwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDec77%77%45%45%clearovercastprecipitation: 2.1 inprecipitation: 2.1 in0.1 in0.1 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 6.9tourism score: 6.90.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Gillette-Campbell County Airport for warm-weather activities is from late June to late August.

Temperature

The hot season lasts for 2.9 months, from June 15 to September 11, with an average daily high temperature above 77°F. The hottest day of the year is July 27, with an average high of 87°F and low of 58°F.

The cold season lasts for 3.6 months, from November 17 to March 5, with an average daily high temperature below 44°F. The coldest day of the year is December 29, with an average low of 14°F and high of 34°F.

Average High and Low Temperature

Average High and Low Temperature at Gillette-Campbell County AirporthotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-10°F0°F10°F20°F30°F40°F50°F60°F70°F80°F90°F100°FDec 2934°FDec 2934°FJul 2787°FJul 2787°F14°F14°F58°F58°FJun 1577°FJun 1577°FSep 1177°FSep 1177°FMar 544°FMar 544°F50°F50°F49°F49°F24°F24°F23°F23°FLowHigh
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 entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature at Gillette-Campbell County AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingfreezingvery coldvery coldcoldcoldcoolwarmcomfortable
The average hourly temperature, color coded into bands: 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 shaded overlays indicate night and civil twilight.

Hozat, Turkey (6,274 miles away) and Fareydūnshahr, Iran (6,889 miles) are the far-away foreign places with temperatures most similar to Gillette-Campbell County Airport (view comparison).

Clouds

At Gillette-Campbell County Airport, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year at Gillette-Campbell County Airport begins around June 7 and lasts for 4.1 months, ending around October 11. On July 4, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 77% of the time, and overcast or mostly cloudy 23% of the time.

The cloudier part of the year begins around October 11 and lasts for 7.9 months, ending around June 7. On March 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% of the time.

Cloud Cover Categories

Cloud Cover Categories at Gillette-Campbell County AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 477%Jul 477%Mar 2045%Mar 2045%Jun 760%Jun 760%Oct 1161%Oct 1161%clearmostly clearpartly cloudymostly cloudyovercast
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Gillette-Campbell County Airport varies throughout the year.

The wetter season lasts 3.8 months, from April 14 to August 8, with a greater than 17% chance of a given day being a wet day. The chance of a wet day peaks at 31% on June 2.

The drier season lasts 8.2 months, from August 8 to April 14. The smallest chance of a wet day is 3% on January 13.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation at Gillette-Campbell County Airport changes throughout the year.

Rain alone is the most common for 8.4 months, from February 1 to February 12 and from March 13 to November 13. The highest chance of a day with rain alone is 31% on June 2.

Snow alone is the most common for 3.6 months, from February 12 to March 13 and from November 13 to February 1. The highest chance of a day with snow alone is 4% on December 12.

Daily Chance of Precipitation

Daily Chance of Precipitation at Gillette-Campbell County AirportsnowsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jun 231%Jun 231%Jan 133%Jan 133%Feb 124%Feb 124%Nov 136%Nov 136%Jan 14%Jan 14%Apr 1417%Apr 1417%Aug 817%Aug 817%rainmixed
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 months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Gillette-Campbell County Airport experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.8 months, from April 2 to October 26, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around May 25, with an average total accumulation of 2.1 inches.

The rainless period of the year lasts for 5.2 months, from October 26 to April 2. The least rain falls around December 15, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

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

The sliding 31-day liquid-equivalent quantity of snowfall at Gillette-Campbell County Airport does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Gillette-Campbell County AirportsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.5 in1.0 in1.5 in2.0 inMar 310.2 inMar 310.2 inJul 130.0 inJul 130.0 inDec 170.1 inDec 170.1 inOct 300.1 inOct 300.1 inMay 120.1 inMay 120.1 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

The length of the day at Gillette-Campbell County Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 51 minutes of daylight; the longest day is June 20, with 15 hours, 32 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Gillette-Campbell County AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 32 minJun 2015 hr, 32 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 228 hr, 51 minDec 218 hr, 51 minDec 21nightnightday
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 is at 5:17 AM on June 15, and the latest sunrise is 2 hours, 26 minutes later at 7:43 AM on November 4. The earliest sunset is at 4:22 PM on December 9, and the latest sunset is 4 hours, 28 minutes later at 8:50 PM on June 26.

Daylight saving time (DST) is observed at Gillette-Campbell County Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Gillette-Campbell County AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:17 AMJun 155:17 AM8:50 PMJun 268:50 PMJun 26Dec 94:22 PMDec 94:22 PM7:43 AMNov 47:43 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. 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. The transitions to and from daylight saving time are indicated by the 'DST' labels.

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 perceived humidity level at Gillette-Campbell County Airport, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.

Humidity Comfort Levels

Humidity Comfort Levels at Gillette-Campbell County AirportJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Jan 130%Jan 130%Jul 280%Jul 280%drydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

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 at Gillette-Campbell County Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.4 months, from September 24 to June 4, with average wind speeds of more than 10.1 miles per hour. The windiest day of the year is January 17, with an average hourly wind speed of 11.3 miles per hour.

The calmer time of year lasts for 3.6 months, from June 4 to September 24. The calmest day of the year is July 26, with an average hourly wind speed of 8.8 miles per hour.

Average Wind Speed

Average Wind Speed at Gillette-Campbell County AirportwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mph18 mphJan 1711.3 mphJan 1711.3 mphJul 268.8 mphJul 268.8 mphSep 2410.1 mphSep 2410.1 mphJun 410.1 mphJun 410.1 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Gillette-Campbell County Airport varies throughout the year.

The wind is most often from the north for 4.3 months, from March 8 to July 17 and for 1.2 months, from September 11 to October 18, with a peak percentage of 37% on April 5. The wind is most often from the south for 1.8 months, from July 17 to September 11, with a peak percentage of 35% on August 20. The wind is most often from the west for 4.7 months, from October 18 to March 8, with a peak percentage of 49% on January 1.

Wind Direction

Wind Direction at Gillette-Campbell County AirportWNSNWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westsouthnortheast
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Gillette-Campbell County Airport throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Gillette-Campbell County Airport for general outdoor tourist activities is from late June to late August, with a peak score in the last week of July.

Tourism Score

Tourism Score at Gillette-Campbell County Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.96.90.00.0precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Gillette-Campbell County Airport for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score

Beach/Pool Score at Gillette-Campbell County Airportbest timeJanFebMarAprMayJunJulAugSepOctNovDec02468104.64.60.00.0 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

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 at Gillette-Campbell County Airport typically lasts for 4.4 months (137 days), from around May 15 to around September 29, rarely starting before April 29 or after June 1, and rarely ending before September 10 or after October 16.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Gillette-Campbell County Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 1550%May 1550%Sep 2950%Sep 2950%Jun 190%Jun 190%Sep 1090%Sep 1090%Apr 2910%Apr 2910%Oct 1610%Oct 1610%0%Dec 10%Dec 1Jul 25100%Jul 25100%frigidfreezingvery coldcoolcomfortablewarmhotcold
The percentage of time spent in various temperature bands: 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 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.

Based on growing degree days alone, the first spring blooms at Gillette-Campbell County Airport should appear around April 22, only rarely appearing before April 8 or after May 8.

Growing Degree Days

Growing Degree Days at Gillette-Campbell County AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°FApr 2290°FApr 2290°FJul 10900°FJul 10900°FAug 231,800°FAug 231,800°FDec 312,419°FDec 312,419°F
The average growing degree days accumulated over the course of the year, 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 experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.1 months, from May 13 to August 17, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest day of the year is July 3, with an average of 7.9 kWh.

The darker period of the year lasts for 3.5 months, from October 29 to February 14, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 21, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Gillette-Campbell County AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJul 37.9 kWhJul 37.9 kWhDec 211.7 kWhDec 211.7 kWhMay 136.7 kWhMay 136.7 kWhAug 176.7 kWhAug 176.7 kWhOct 293.0 kWhOct 293.0 kWhFeb 143.0 kWhFeb 143.0 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 Gillette-Campbell County Airport are 44.349 deg latitude, -105.540 deg longitude, and 4,409 ft elevation.

The topography within 2 miles of Gillette-Campbell County Airport contains only modest variations in elevation, with a maximum elevation change of 456 feet and an average elevation above sea level of 4,385 feet. Within 10 miles contains only modest variations in elevation (945 feet). Within 50 miles contains very significant variations in elevation (2,772 feet).

The area within 2 miles of Gillette-Campbell County Airport is covered by grassland (82%) and shrubs (15%), within 10 miles by grassland (89%), and within 50 miles by grassland (85%) and shrubs (14%).

Data Sources

This report illustrates the typical weather at Gillette-Campbell County Airport, 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

Gillette-Campbell County Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back are Johnson County Airport, Sheridan County Airport, Black Hills Airport, Custer County Airfield, Worland Municipal Airport, and Ellsworth Air Force Base.

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.