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Average Weather in Wasco California, United States

In Wasco, the summers are sweltering and clear and the winters are cold and partly cloudy. Over the course of the year, the temperature typically varies from 40°F to 99°F and is rarely below 32°F or above 106°F.

The hot season lasts for 3.4 months, from June 8 to September 21, with an average daily high temperature above 91°F. The hottest day of the year is July 23, with an average high of 99°F and low of 67°F.

The cool season lasts for 3.1 months, from November 20 to February 23, with an average daily high temperature below 66°F. The coldest day of the year is January 31, with an average low of 40°F and high of 62°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 in Wasco12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillycoldcoolcomfortablewarmhotsweltering
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 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.


In Wasco, 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 Wasco begins around May 7 and lasts for 5.8 months, ending around November 1. On August 9, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 92% of the time, and overcast or mostly cloudy 8% of the time.

The cloudier part of the year begins around November 1 and lasts for 6.2 months, ending around May 7. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 43% of the time, and clear, mostly clear, or partly cloudy 57% of the time.

Cloud Cover

Cloud Cover in Wascoclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 2143%Feb 2143%Aug 98%Aug 98%May 726%May 726%Nov 126%Nov 126%overcastmostly cloudymostly clearclear
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.


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

The wetter season lasts 5.1 months, from November 9 to April 12, with a greater than 12% chance of a given day being a wet day. The chance of a wet day peaks at 23% on February 21.

The drier season lasts 6.9 months, from April 12 to November 9. The smallest chance of a wet day is 0% on June 27.

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 throughout the year is rain alone, with a peak probability of 23% on February 21.

Daily Chance of Precipitation

Daily Chance of Precipitation in Wascowetwetdry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 2123%Feb 2123%Jun 270%Jun 270%Jan 13%Jan 13%Nov 912%Nov 912%Apr 1212%Apr 1212%rain
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).


The length of the day in Wasco varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 45 minutes of daylight; the longest day is June 21, with 14 hours, 34 minutes of daylight.

Hours of Daylight and Twilight

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 5:41 AM on June 12, and the latest sunrise is 1 hour, 41 minutes later at 7:22 AM on November 4. The earliest sunset is at 4:43 PM on December 5, and the latest sunset is 3 hours, 33 minutes later at 8:17 PM on June 28.

Daylight saving time (DST) is observed in Wasco 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 in Wasco12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 125:41 AMJun 125:41 AM8:17 PMJun 288:17 PMJun 28Dec 54:43 PMDec 54:43 PM7:22 AMNov 47:22 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
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.


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 in Wasco, 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 in Wasco0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 80%Feb 80%Aug 301%Aug 301%humidhumiddrydry
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.


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 Wasco experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.6 months, from March 27 to August 14, with average wind speeds of more than 3.2 miles per hour. The windiest day of the year is June 1, with an average hourly wind speed of 3.8 miles per hour.

The calmer time of year lasts for 7.4 months, from August 14 to March 27. The calmest day of the year is November 10, with an average hourly wind speed of 2.6 miles per hour.

Average Wind Speed

Average Wind Speed in Wascowindy0.0 mph0.5 mph1.0 mph1.5 mph2.0 mph2.5 mph3.0 mph3.5 mph4.0 mph4.5 mph5.0 mph5.5 mph6.0 mphJanFebMarAprMayJunJulAugSepOctNovDecJun 13.8 mphJun 13.8 mphNov 102.6 mphNov 102.6 mphMar 273.2 mphMar 273.2 mphAug 143.2 mphAug 143.2 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 in Wasco varies throughout the year.

The wind is most often from the west for 9.2 months, from February 18 to November 23, with a peak percentage of 69% on July 30. The wind is most often from the south for 2.8 months, from November 23 to February 18, with a peak percentage of 40% on January 1.

Wind Direction

Wind Direction in WascoSWS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsouthnortheast
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).

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 3.7 months, from May 1 to August 23, with an average daily incident shortwave energy per square meter above 7.4 kWh. The brightest day of the year is June 21, with an average of 8.6 kWh.

The darker period of the year lasts for 3.4 months, from November 4 to February 15, with an average daily incident shortwave energy per square meter below 3.9 kWh. The darkest day of the year is December 26, with an average of 2.7 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Wascobrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJanFebMarAprMayJunJulAugSepOctNovDecJun 218.6 kWhJun 218.6 kWhDec 262.7 kWhDec 262.7 kWhMay 17.4 kWhMay 17.4 kWhAug 237.4 kWhAug 237.4 kWhNov 43.9 kWhNov 43.9 kWhFeb 153.9 kWhFeb 153.9 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.


For the purposes of this report, the geographical coordinates of Wasco are 35.594 deg latitude, -119.341 deg longitude, and 325 ft elevation.

The topography within 2 miles of Wasco is essentially flat, with a maximum elevation change of 49 feet and an average elevation above sea level of 327 feet. Within 10 miles is essentially flat (305 feet). Within 50 miles contains only modest variations in elevation (8,041 feet).

The area within 2 miles of Wasco is covered by cropland (81%) and artificial surfaces (19%), within 10 miles by cropland (95%), and within 50 miles by grassland (41%) and cropland (40%).

Data Sources

This report illustrates the typical weather in Wasco, 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Wasco.

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

The stations contributing to this reconstruction are: Meadows Field (51%, 32 kilometers, southeast); Porterville Municipal Airport (23%, 55 kilometers, northeast); Paso Robles Municipal Airport (7%, 117 kilometers, west); San Luis Obispo County Airport (7%, 124 kilometers, west); Santa Maria Airport (6%, 127 kilometers, southwest); and Santa Ynez Airport (6%, 129 kilometers, southwest).

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.