Average Weather in Downieville California, United States
In Downieville, the summers are warm, arid, and mostly clear and the winters are long, chilly, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 35°F to 81°F and is rarely below 26°F or above 88°F.
The warm season lasts for 3.1 months, from June 17 to September 20, with an average daily high temperature above 74°F. The hottest day of the year is August 3, with an average high of 81°F and low of 64°F.
The cool season lasts for 4.2 months, from November 15 to March 20, with an average daily high temperature below 52°F. The coldest day of the year is December 29, with an average low of 35°F and high of 45°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 Downieville, 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 Downieville begins around May 28 and lasts for 4.7 months, ending around October 20. On July 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 89% of the time, and overcast or mostly cloudy 11% of the time.
The cloudier part of the year begins around October 20 and lasts for 7.3 months, ending around May 28. On February 26, the cloudiest day of the year, the sky is overcast or mostly cloudy 62% of the time, and clear, mostly clear, or partly cloudy 38% 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 Downieville varies significantly throughout the year.
The wetter season lasts 6.0 months, from October 27 to April 27, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 37% on March 1.
The drier season lasts 6.0 months, from April 27 to October 27. The smallest chance of a wet day is 1% 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 31% on March 1.
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. Downieville experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 9.1 months, from September 14 to June 16, 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 6.2 inches.
The rainless period of the year lasts for 2.9 months, from June 16 to September 14. The least rain falls around July 30, with an average total accumulation of 0.1 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. Downieville experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.7 months, from November 24 to April 14, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 17, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 7.3 months, from April 14 to November 24. The least snow falls around August 9, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Downieville varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 22 minutes of daylight; the longest day is June 21, with 14 hours, 58 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:35 AM on June 13, and the latest sunrise is 2 hours, 0 minutes later at 7:35 AM on November 4. The earliest sunset is at 4:39 PM on December 7, and the latest sunset is 3 hours, 56 minutes later at 8:34 PM on June 27.
Daylight saving time (DST) is observed in Downieville 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 Downieville, 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 Downieville varies throughout the year.
The wind is most often from the south for 7.4 months, from February 1 to September 14 and for 1.1 months, from November 3 to December 6, with a peak percentage of 50% on February 27. The wind is most often from the east for 1.6 months, from September 14 to November 3 and for 1.8 months, from December 6 to February 1, with a peak percentage of 42% on October 20.
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 24, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is July 1, with an average of 8.6 kWh.
The darker period of the year lasts for 3.6 months, from November 1 to February 18, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 19, with an average of 2.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Downieville are 39.559 deg latitude, -120.827 deg longitude, and 4,114 ft elevation.
The topography within 2 miles of Downieville contains large variations in elevation, with a maximum elevation change of 2,654 feet and an average elevation above sea level of 3,916 feet. Within 10 miles contains large variations in elevation (6,198 feet). Within 50 miles also contains extreme variations in elevation (10,187 feet).
The area within 2 miles of Downieville is covered by trees (95%), within 10 miles by trees (91%), and within 50 miles by trees (59%) and shrubs (25%).
This report illustrates the typical weather in Downieville, 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 Downieville.
For each station, the records are corrected for the elevation difference between that station and Downieville 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 Downieville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Downieville and a given station.
The stations contributing to this reconstruction are: Blue Canyon-Nyack Airport (71%, 33 kilometers, south); Oroville Municipal Airport (15%, 68 kilometers, west); and Beale Air Force Base (14%, 71 kilometers, southwest).
Time zones for aiports and weather stations are provided by AskGeo.com .