Average Weather in Penn Valley California, United States
In Penn Valley, the summers are hot, arid, and mostly clear and the winters are cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 38°F to 91°F and is rarely below 31°F or above 99°F.
The hot season lasts for 3.3 months, from June 12 to September 21, with an average daily high temperature above 83°F. The hottest day of the year is July 28, with an average high of 91°F and low of 66°F.
The cool season lasts for 3.6 months, from November 17 to March 6, with an average daily high temperature below 60°F. The coldest day of the year is December 30, with an average low of 38°F and high of 52°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 Penn Valley, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Penn Valley begins around May 23 and lasts for 5.0 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 7.0 months, ending around May 23. On February 26, the cloudiest day of the year, the sky is overcast or mostly cloudy 60% of the time, and clear, mostly clear, or partly cloudy 40% 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 Penn Valley varies significantly throughout the year.
The wetter season lasts 5.7 months, from October 28 to April 20, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 35% on February 27.
The drier season lasts 6.3 months, from April 20 to October 28. 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 27.
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. Penn Valley experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.6 months, from September 21 to June 8, 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 5.6 inches.
The rainless period of the year lasts for 3.4 months, from June 8 to September 21. 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 Penn Valley varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 25 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 5:37 AM on June 14, and the latest sunrise is 1 hour, 58 minutes later at 7:36 AM on November 4. The earliest sunset is at 4:41 PM on December 6, and the latest sunset is 3 hours, 53 minutes later at 8:35 PM on June 27.
Daylight saving time (DST) is observed in Penn Valley 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 Penn Valley, 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 Penn Valley varies throughout the year.
The wind is most often from the south for 7.4 months, from February 15 to September 28, with a peak percentage of 61% on August 12. The wind is most often from the east for 4.5 months, from September 28 to February 15, with a peak percentage of 50% 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 3.4 months, from May 12 to August 25, with an average daily incident shortwave energy per square meter above 7.1 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 3.7 months, from November 1 to February 21, with an average daily incident shortwave energy per square meter below 3.3 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 Penn Valley are 39.196 deg latitude, -121.191 deg longitude, and 1,529 ft elevation.
The topography within 2 miles of Penn Valley contains very significant variations in elevation, with a maximum elevation change of 945 feet and an average elevation above sea level of 1,537 feet. Within 10 miles contains very significant variations in elevation (2,904 feet). Within 50 miles contains large variations in elevation (9,114 feet).
The area within 2 miles of Penn Valley is covered by shrubs (54%) and grassland (37%), within 10 miles by grassland (43%) and shrubs (42%), and within 50 miles by trees (39%) and cropland (25%).
This report illustrates the typical weather in Penn Valley, 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 Penn Valley.
For each station, the records are corrected for the elevation difference between that station and Penn Valley 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 Penn Valley is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Penn Valley and a given station.
The stations contributing to this reconstruction are: Beale Air Force Base (29%, 22 kilometers, west); Auburn Municipal Airport (64%, 28 kilometers, south); and Blue Canyon-Nyack Airport (7%, 42 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .