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Average Weather at Green River Range Utah, United States

At Green River Range, the summers are hot and mostly clear; the winters are short, freezing, and partly cloudy; and it is dry year round. Over the course of the year, the temperature typically varies from 18°F to 95°F and is rarely below 6°F or above 102°F.

Climate Summary

very coldcoldcoolwarmhothotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDec80%80%54%54%clearovercastprecipitation: 0.9 inprecipitation: 0.9 in0.3 in0.3 inmuggy: 2%muggy: 2%0%0%drydrytourism score: 7.2tourism score: 7.20.00.0
Click on each chart for more information.

Based on the tourism score, the best time of year to visit Green River Range for warm-weather activities is from early June to mid September.

Temperature

The hot season lasts for 3.5 months, from May 29 to September 14, with an average daily high temperature above 84°F. The hottest day of the year is July 12, with an average high of 95°F and low of 65°F.

The cold season lasts for 2.8 months, from November 23 to February 16, with an average daily high temperature below 50°F. The coldest day of the year is January 3, with an average low of 18°F and high of 39°F.

Average High and Low Temperature

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 Green River RangeJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMfreezingfreezingcoolcomfortablehotvery coldfreezingcoldcoolwarmwarmcoldfreezingvery cold
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.

Yerevan, Armenia (6,745 miles away) and Arys, Kazakhstan (6,818 miles) are the far-away foreign places with temperatures most similar to Green River Range (view comparison).

Clouds

At Green River Range, 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 Green River Range begins around May 28 and lasts for 5.0 months, ending around October 30. On September 19, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 80% of the time, and overcast or mostly cloudy 20% of the time.

The cloudier part of the year begins around October 30 and lasts for 7.0 months, ending around May 28. On March 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 46% of the time, and clear, mostly clear, or partly cloudy 54% of the time.

Cloud Cover Categories

Cloud Cover Categories at Green River RangeclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1980%Sep 1980%Mar 154%Mar 154%May 2867%May 2867%Oct 3067%Oct 3067%clearovercastmostly clearmostly cloudypartly cloudy
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 Green River Range varies throughout the year.

The wetter season lasts 10 months, from July 10 to May 12, with a greater than 10% chance of a given day being a wet day. The chance of a wet day peaks at 16% on August 10.

The drier season lasts 2.0 months, from May 12 to July 10. The smallest chance of a wet day is 5% on June 19.

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 Green River Range changes throughout the year.

Rain alone is the most common for 10 months, from January 27 to December 6. The highest chance of a day with rain alone is 16% on August 10.

Mixed snow and rain is the most common for 1.7 months, from December 6 to January 27. The highest chance of a day with mixed snow and rain is 5% on January 3.

Daily Chance of Precipitation

Daily Chance of Precipitation at Green River RangerainJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Aug 1016%Aug 1016%Jun 195%Jun 195%Jan 278%Jan 278%Dec 67%Dec 67%May 1210%May 1210%rainmixedsnow
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. Green River Range experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 6.5 months, from April 20 to November 4, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 29, with an average total accumulation of 0.9 inches.

The rainless period of the year lasts for 5.5 months, from November 4 to April 20. The least rain falls around January 8, with an average total accumulation of 0.1 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

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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Green River Range experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 2.3 months, from November 27 to February 7, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 4, with an average total liquid-equivalent accumulation of 0.3 inches.

The snowless period of the year lasts for 9.7 months, from February 7 to November 27. The least snow falls around July 9, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall at Green River RangesnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.2 in0.4 in0.6 in0.8 in1.0 inJan 40.3 inJan 40.3 inJul 90.0 inJul 90.0 inNov 270.1 inNov 270.1 inFeb 70.1 inFeb 70.1 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 Green River Range varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 26 minutes of daylight; the longest day is June 20, with 14 hours, 55 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Green River RangeJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 55 minJun 2014 hr, 55 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 26 minDec 219 hr, 26 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 5:54 AM on June 13, and the latest sunrise is 1 hour, 57 minutes later at 7:51 AM on November 4. The earliest sunset is at 4:58 PM on December 5, and the latest sunset is 3 hours, 52 minutes later at 8:50 PM on June 27.

Daylight saving time (DST) is observed at Green River Range 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 Green River RangeJanFebMarAprMayJunJulAugSepOctNovDec2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:54 AMJun 135:54 AM8:50 PMJun 278:50 PMJun 27Dec 54:58 PMDec 54:58 PM7:51 AMNov 47:51 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 Green River Range, 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, staying within 1% of 1% throughout.

Humidity Comfort Levels

Humidity Comfort Levels at Green River RangeJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Nov 260%Nov 260%Aug 12%Aug 12%drydrycomfortablecomfortablehumidhumid
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 Green River Range experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.2 months, from February 27 to July 2, with average wind speeds of more than 7.4 miles per hour. The windiest day of the year is April 11, with an average hourly wind speed of 8.9 miles per hour.

The calmer time of year lasts for 7.9 months, from July 2 to February 27. The calmest day of the year is January 11, with an average hourly wind speed of 5.9 miles per hour.

Average Wind Speed

Average Wind Speed at Green River RangewindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mphApr 118.9 mphApr 118.9 mphJan 115.9 mphJan 115.9 mphFeb 277.4 mphFeb 277.4 mphJul 27.4 mphJul 27.4 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 Green River Range varies throughout the year.

The wind is most often from the west for 6.0 days, from May 2 to May 8, with a peak percentage of 31% on May 4. The wind is most often from the south for 7.0 months, from May 8 to December 7, with a peak percentage of 46% on August 21. The wind is most often from the north for 4.8 months, from December 7 to May 2, with a peak percentage of 38% on January 1.

Wind Direction

Wind Direction at Green River RangeNSNJanFebMarAprMayJunJulAugSepOctNovDec0%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 Green River Range 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 Green River Range for general outdoor tourist activities is from early June to mid September, with a peak score in the third week of August.

Tourism Score

Tourism Score at Green River Rangebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.27.20.00.07.17.1precipitationprecipitationcloudscloudstourism 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 Green River Range for hot-weather activities is from late June to mid August, with a peak score in the third week of July.

Beach/Pool Score

Beach/Pool Score at Green River Rangebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468106.46.40.00.0 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 Green River Range typically lasts for 6.0 months (182 days), from around April 16 to around October 15, rarely starting before March 29 or after May 6, and rarely ending before September 27 or after November 5.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Green River Rangegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 1650%Apr 1650%Oct 1550%Oct 1590%May 690%May 690%Sep 2790%Sep 2710%Mar 2910%Mar 2910%Nov 510%Nov 50%Feb 50%Feb 5Jul 18100%Jul 18100%freezingvery coldcomfortablewarmhotcoldcoolfrigid
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 Green River Range should appear around March 26, only rarely appearing before March 15 or after April 8.

Growing Degree Days

Growing Degree Days at Green River RangeJanFebMarAprMayJunJulAugSepOctNovDec0°F500°F1,000°F1,500°F2,000°F2,500°F3,000°F3,500°F4,000°FMar 2688°FMar 2688°FJun 4900°FJun 4900°FJul 101,800°FJul 101,800°FDec 314,039°FDec 314,039°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 3.0 months, from May 5 to August 4, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is June 14, with an average of 8.5 kWh.

The darker period of the year lasts for 3.4 months, from November 1 to February 13, with an average daily incident shortwave energy per square meter below 3.7 kWh. The darkest day of the year is December 22, with an average of 2.5 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy at Green River RangebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJun 148.5 kWhJun 148.5 kWhDec 222.5 kWhDec 222.5 kWhMay 57.3 kWhMay 57.3 kWhAug 47.3 kWhAug 47.3 kWhNov 13.7 kWhNov 13.7 kWhFeb 133.7 kWhFeb 133.7 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.

Data Sources

This report illustrates the typical weather at Green River Range, 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

Green River Range 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 Canyonlands Field and Carbon County Airport.

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.