Average Weather in Cool California, United States
In Cool, the summers are hot, arid, and mostly clear and the winters are long, cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 39°F to 93°F and is rarely below 33°F or above 101°F.
The hot season lasts for 3.2 months, from June 14 to September 20, with an average daily high temperature above 85°F. The hottest day of the year is July 28, with an average high of 93°F and low of 67°F.
The cool season lasts for 3.8 months, from November 16 to March 10, with an average daily high temperature below 62°F. The coldest day of the year is December 30, with an average low of 39°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 Cool, 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 Cool begins around May 21 and lasts for 5.1 months, ending around October 23. On July 21, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 90% of the time, and overcast or mostly cloudy 10% of the time.
The cloudier part of the year begins around October 23 and lasts for 6.9 months, ending around May 21. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% 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 Cool varies significantly throughout the year.
The wetter season lasts 5.6 months, from October 29 to April 16, with a greater than 17% chance of a given day being a wet day. The chance of a wet day peaks at 34% on February 20.
The drier season lasts 6.4 months, from April 16 to October 29. 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 34% 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. Cool experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.5 months, from September 22 to June 6, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 17, with an average total accumulation of 5.5 inches.
The rainless period of the year lasts for 3.5 months, from June 6 to September 22. The least rain falls around July 30, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Cool 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 21, with 14 hours, 54 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:38 AM on June 14, and the latest sunrise is 1 hour, 57 minutes later at 7:34 AM on November 4. The earliest sunset is at 4:41 PM on December 7, and the latest sunset is 3 hours, 52 minutes later at 8:33 PM on June 27.
Daylight saving time (DST) is observed in Cool 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 Cool, 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
Average Wind Speed
The predominant average hourly wind direction in Cool varies throughout the year.
The wind is most often from the south for 8.4 months, from February 3 to October 16 and for 1.0 months, from November 1 to December 1, with a peak percentage of 56% on August 12. The wind is most often from the east for 2.3 weeks, from October 16 to November 1 and for 2.1 months, from December 1 to February 3, with a peak percentage of 36% on October 29.
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 3.5 months, from May 10 to August 24, with an average daily incident shortwave energy per square meter above 7.2 kWh. The brightest day of the year is July 1, with an average of 8.5 kWh.
The darker period of the year lasts for 3.6 months, from November 2 to February 20, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 20, with an average of 2.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Cool are 38.887 deg latitude, -121.015 deg longitude, and 1,381 ft elevation.
The topography within 2 miles of Cool contains very significant variations in elevation, with a maximum elevation change of 1,257 feet and an average elevation above sea level of 1,431 feet. Within 10 miles contains very significant variations in elevation (2,464 feet). Within 50 miles contains large variations in elevation (9,915 feet).
The area within 2 miles of Cool is covered by grassland (53%), shrubs (26%), and trees (20%), within 10 miles by shrubs (39%) and grassland (30%), and within 50 miles by trees (35%) and cropland (21%).
This report illustrates the typical weather in Cool, 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 Cool.
For each station, the records are corrected for the elevation difference between that station and Cool 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 Cool is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Cool and a given station.
The stations contributing to this reconstruction are: Auburn Municipal Airport (85%, 10 kilometers, northwest); Placerville Airport (9%, 30 kilometers, southeast); and Sacramento Mather Airport (6%, 43 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .