Average Weather in Walnut Grove California, United States
In Walnut Grove, the summers are hot, arid, and clear and the winters are short, cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 40°F to 92°F and is rarely below 31°F or above 102°F.
The hot season lasts for 3.8 months, from June 5 to September 29, with an average daily high temperature above 84°F. The hottest day of the year is July 28, with an average high of 92°F and low of 60°F.
The cool season lasts for 2.8 months, from November 23 to February 17, with an average daily high temperature below 62°F. The coldest day of the year is December 31, with an average low of 40°F and high of 54°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 Walnut Grove, 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 Walnut Grove begins around May 14 and lasts for 5.4 months, ending around October 25. On July 29, 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 October 25 and lasts for 6.6 months, ending around May 14. On January 11, 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.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Walnut Grove varies throughout the year.
The wetter season lasts 5.2 months, from November 5 to April 10, with a greater than 15% chance of a given day being a wet day. The chance of a wet day peaks at 29% on February 20.
The drier season lasts 6.8 months, from April 10 to November 5. The smallest chance of a wet day is 0% on July 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 throughout the year is rain alone, with a peak probability of 29% on February 20.
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. Walnut Grove experiences significant seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.5 months, from October 3 to May 18, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 15, with an average total accumulation of 3.6 inches.
The rainless period of the year lasts for 4.5 months, from May 18 to October 3. The least rain falls around August 1, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Walnut Grove varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 30 minutes of daylight; the longest day is June 21, with 14 hours, 50 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:42 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 7:35 AM on November 4. The earliest sunset is at 4:45 PM on December 6, and the latest sunset is 3 hours, 48 minutes later at 8:33 PM on June 27.
Daylight saving time (DST) is observed in Walnut Grove 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
The perceived humidity level in Walnut Grove, 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 in Walnut Grove experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.8 months, from April 15 to September 9, with average wind speeds of more than 3.8 miles per hour. The windiest day of the year is July 15, with an average hourly wind speed of 4.6 miles per hour.
The calmer time of year lasts for 7.2 months, from September 9 to April 15. The calmest day of the year is October 29, with an average hourly wind speed of 3.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Walnut Grove varies throughout the year.
The wind is most often from the south for 2.9 weeks, from February 8 to February 28, with a peak percentage of 35% on February 21. The wind is most often from the west for 8.4 months, from February 28 to November 11, with a peak percentage of 77% on July 13. The wind is most often from the north for 2.9 months, from November 11 to February 8, with a peak percentage of 41% on January 1.
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 3.6 months, from May 7 to August 25, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest day of the year is June 26, with an average of 8.5 kWh.
The darker period of the year lasts for 3.6 months, from November 3 to February 19, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 26, with an average of 2.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Walnut Grove are 38.242 deg latitude, -121.512 deg longitude, and 3 ft elevation.
The topography within 2 miles of Walnut Grove is essentially flat, with a maximum elevation change of 10 feet and an average elevation above sea level of 4 feet. Within 10 miles is also essentially flat (46 feet). Within 50 miles is essentially flat (3,812 feet).
The area within 2 miles of Walnut Grove is covered by cropland (78%) and herbaceous vegetation (22%), within 10 miles by cropland (84%) and herbaceous vegetation (12%), and within 50 miles by cropland (37%) and grassland (33%).
This report illustrates the typical weather in Walnut Grove, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Walnut Grove.
For each station, the records are corrected for the elevation difference between that station and Walnut Grove 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 Walnut Grove is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Walnut Grove and a given station.
The stations contributing to this reconstruction are: Sacramento Executive Airport (40%, 30 kilometers, north); Travis Air Force Base (28%, 37 kilometers, west); Stockton Metropolitan Airport (20%, 47 kilometers, southeast); and Livermore Municipal Airport (11%, 67 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .