Average Weather in Castle Dale Utah, United States
In Castle Dale, the summers are warm, dry, and mostly clear and the winters are freezing, snowy, and partly cloudy. Over the course of the year, the temperature typically varies from 16°F to 88°F and is rarely below 4°F or above 95°F.
Based on the tourism score, the best time of year to visit Castle Dale for warm-weather activities is from mid June to early September.
The hot season lasts for 3.4 months, from June 2 to September 14, with an average daily high temperature above 77°F. The hottest day of the year is July 13, with an average high of 88°F and low of 61°F.
The cold season lasts for 3.0 months, from November 21 to February 23, with an average daily high temperature below 45°F. The coldest day of the year is January 4, with an average low of 16°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
In Castle Dale, 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 in Castle Dale begins around May 31 and lasts for 4.9 months, ending around October 27. On September 17, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 79% of the time, and overcast or mostly cloudy 21% of the time.
The cloudier part of the year begins around October 27 and lasts for 7.1 months, ending around May 31. On March 1, the cloudiest day of the year, the sky is overcast or mostly cloudy 48% of the time, and clear, mostly clear, or partly cloudy 52% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Castle Dale varies throughout the year.
The wetter season lasts 10 months, from July 16 to May 18, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 19% on August 30.
The drier season lasts 2.0 months, from May 18 to July 16. The smallest chance of a wet day is 8% on June 20.
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 in Castle Dale changes throughout the year.
Rain alone is the most common for 9.9 months, from February 8 to December 5. The highest chance of a day with rain alone is 19% on August 30.
Snow alone is the most common for 1.7 months, from December 5 to January 25. The highest chance of a day with snow alone is 7% on January 1.
Mixed snow and rain is the most common for 2.0 weeks, from January 25 to February 8. The highest chance of a day with mixed snow and rain is 6% on February 22.
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. Castle Dale experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.9 months, from February 18 to November 16, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 28, with an average total accumulation of 1.1 inches.
The rainless period of the year lasts for 3.1 months, from November 16 to February 18. The least rain falls around January 16, with an average total accumulation of 0.2 inches.
Average Monthly Rainfall
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. Castle Dale experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.3 months, from November 7 to March 17, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 31, with an average total liquid-equivalent accumulation of 0.5 inches.
The snowless period of the year lasts for 7.7 months, from March 17 to November 7. The least snow falls around July 25, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Castle Dale varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 24 minutes of daylight; the longest day is June 21, with 14 hours, 56 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:57 AM on June 14, and the latest sunrise is 1 hour, 57 minutes later at 7:54 AM on November 3. The earliest sunset is at 5:00 PM on December 7, and the latest sunset is 3 hours, 54 minutes later at 8:54 PM on June 27.
Daylight saving time (DST) is observed in Castle Dale 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 in Castle Dale, 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Castle Dale experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 5.5 months, from January 8 to June 22, with average wind speeds of more than 7.4 miles per hour. The windiest day of the year is April 7, with an average hourly wind speed of 9.1 miles per hour.
The calmer time of year lasts for 6.5 months, from June 22 to January 8. The calmest day of the year is August 11, with an average hourly wind speed of 5.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Castle Dale is from the west throughout the year.
Best Time of Year to Visit
To characterize how pleasant the weather is in Castle Dale 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 Castle Dale for general outdoor tourist activities is from mid June to early September, 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 Castle Dale for hot-weather activities is from late June to early August, with a peak score in the third 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 in Castle Dale typically lasts for 5.4 months (164 days), from around April 30 to around October 11, rarely starting before April 10 or after May 18, and rarely ending before September 22 or after October 31.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Castle Dale should appear around April 18, only rarely appearing before April 1 or after May 4.
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 2.8 months, from May 8 to August 2, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest day of the year is June 18, with an average of 8.4 kWh.
The darker period of the year lasts for 3.4 months, from November 1 to February 12, 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
For the purposes of this report, the geographical coordinates of Castle Dale are 39.212 deg latitude, -111.020 deg longitude, and 5,705 ft elevation.
The topography within 2 miles of Castle Dale contains only modest variations in elevation, with a maximum elevation change of 390 feet and an average elevation above sea level of 5,706 feet. Within 10 miles contains only modest variations in elevation (4,449 feet). Within 50 miles also contains extreme variations in elevation (7,510 feet).
The area within 2 miles of Castle Dale is covered by cropland (48%), shrubs (39%), and grassland (13%), within 10 miles by shrubs (86%), and within 50 miles by shrubs (77%) and trees (14%).
This report illustrates the typical weather in Castle Dale, 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 Castle Dale.
For each station, the records are corrected for the elevation difference between that station and Castle Dale 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 Castle Dale is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Castle Dale and a given station.
The stations contributing to this reconstruction are: Carbon County Airport (57%, 50 kilometers, northeast); Green River Range (23%, 79 kilometers, east); and Hanksville Airport (20%, 93 kilometers, south).
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.
Time zones for aiports and weather stations are provided by AskGeo.com .