Average Weather in Oroville California, United States
In Oroville, 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 40°F to 95°F and is rarely below 32°F or above 103°F.
The hot season lasts for 3.4 months, from June 8 to September 20, with an average daily high temperature above 86°F. The hottest day of the year is July 19, with an average high of 95°F and low of 66°F.
The cool season lasts for 3.1 months, from November 19 to February 22, 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 53°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 Oroville, 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 Oroville begins around May 23 and lasts for 5.0 months, ending around October 23. On July 29, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 91% of the time, and overcast or mostly cloudy 9% 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 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 Oroville varies significantly throughout the year.
The wetter season lasts 6.0 months, from October 26 to April 25, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 36% on February 28.
The drier season lasts 6.0 months, from April 25 to October 26. 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 36% on February 28.
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. Oroville experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.9 months, from September 16 to June 13, 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 6.3 inches.
The rainless period of the year lasts for 3.1 months, from June 13 to September 16. 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 Oroville varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 23 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 5:38 AM on June 14, and the latest sunrise is 1 hour, 60 minutes later at 7:38 AM on November 4. The earliest sunset is at 4:42 PM on December 7, and the latest sunset is 3 hours, 55 minutes later at 8:37 PM on June 27.
Daylight saving time (DST) is observed in Oroville 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 Oroville, 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 Oroville varies throughout the year.
The wind is most often from the south for 7.2 months, from February 17 to September 23, with a peak percentage of 57% on August 5. The wind is most often from the east for 4.8 months, from September 23 to February 17, with a peak percentage of 47% 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 3.5 months, from May 11 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 8.4 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 1.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Oroville are 39.514 deg latitude, -121.558 deg longitude, and 269 ft elevation.
The topography within 2 miles of Oroville contains only modest variations in elevation, with a maximum elevation change of 427 feet and an average elevation above sea level of 251 feet. Within 10 miles contains only modest variations in elevation (2,280 feet). Within 50 miles contains large variations in elevation (8,428 feet).
The area within 2 miles of Oroville is covered by artificial surfaces (53%), grassland (30%), and cropland (13%), within 10 miles by grassland (43%) and cropland (22%), and within 50 miles by trees (33%) and cropland (30%).
This report illustrates the typical weather in Oroville, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Oroville.
For each station, the records are corrected for the elevation difference between that station and Oroville 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 Oroville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Oroville and a given station.
Time zones for aiports and weather stations are provided by AskGeo.com .