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.
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.
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
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
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
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
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 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
The length of the day at Gillette-Campbell County Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 51 minutes of daylight; the longest day is June 21, with 15 hours, 32 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:17 AM on June 15, and the latest sunrise is 2 hours, 25 minutes later at 7:42 AM on November 3. 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 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
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
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
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.
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.
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.
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.
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
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
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
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%).
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.
Time zones for aiports and weather stations are provided by AskGeo.com .