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Climate and Average Weather Year Round 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.

Based on the tourism score, the best time of year to visit Oroville for warm-weather activities is from early June to late September.

Climate in Oroville

coolcomfortablewarmhothotwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow91%91%41%41%clearovercastprecipitation: 6.3 inprecipitation: 6.3 in0.0 in0.0 inmuggy: 1%muggy: 1%0%0%drydrytourism score: 8.3tourism score: 8.30.50.5
Oroville weather by month. Click on each chart for more information.

The hot season lasts for 3.3 months, from June 8 to September 18, with an average daily high temperature above 87°F. The hottest month of the year in Oroville is July, with an average high of 95°F and low of 66°F.

The cool season lasts for 3.1 months, from November 18 to February 22, with an average daily high temperature below 62°F. The coldest month of the year in Oroville is December, with an average low of 41°F and high of 55°F.

Average High and Low Temperature in Oroville

Average High and Low Temperature in OrovillehotcoolcoolJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°F110°F110°FDec 3053°FDec 3053°FJul 1795°FJul 1795°F40°F40°F67°F67°FJun 887°FJun 887°FSep 1887°FSep 1887°FFeb 2262°FFeb 2262°F61°F61°F60°F60°F45°F45°F45°F45°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.
AverageJanFebMarAprMayJunJulAugSepOctNovDec
High 55°F61°F66°F73°F81°F89°F95°F93°F87°F77°F63°F55°F
Temp. 47°F51°F56°F61°F68°F75°F81°F79°F74°F65°F53°F47°F
Low 41°F44°F47°F50°F57°F63°F66°F65°F60°F53°F46°F41°F

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

Average Hourly Temperature in OrovilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNowNowvery coldcoldcoldcoolcoolcomfortablewarmwarmhotvery cold
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Córdoba, Spain (5,763 miles away) is the far-away foreign place with temperatures most similar to Oroville (view comparison).

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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 21.

The clearest month of the year in Oroville is July, during which on average the sky is clear, mostly clear, or partly cloudy 89% of the time.

The cloudier part of the year begins around October 21 and lasts for 7.0 months, ending around May 23.

The cloudiest month of the year in Oroville is February, during which on average the sky is overcast or mostly cloudy 58% of the time.

Cloud Cover Categories in Oroville

Cloud Cover Categories in OrovilleclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2891%Jul 2891%Feb 2641%Feb 2641%May 2365%May 2365%Oct 2166%Oct 2166%NowNowclearovercastpartly cloudymostly clearmostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.
FractionJanFebMarAprMayJunJulAugSepOctNovDec
Cloudier 57%58%54%45%36%22%11%11%16%31%50%56%
Clearer 43%42%46%55%64%78%89%89%84%69%50%44%

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 25 to April 25, with a greater than 18% chance of a given day being a wet day. The month with the most wet days in Oroville is February, with an average of 9.9 days with at least 0.04 inches of precipitation.

The drier season lasts 6.0 months, from April 25 to October 25. The month with the fewest wet days in Oroville is July, with an average of 0.2 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Oroville is February, with an average of 9.9 days. 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 in Oroville

Daily Chance of Precipitation in OrovillewetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Feb 2836%Feb 2836%Jul 180%Jul 180%Oct 2518%Oct 2518%Apr 2518%Apr 2518%NowNowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).
Days ofJanFebMarAprMayJunJulAugSepOctNovDec
Rain 9.9d9.9d9.5d6.1d3.8d1.6d0.2d0.3d1.7d4.3d8.2d9.9d

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 15 to June 12, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Oroville is February, with an average rainfall of 6.2 inches.

The rainless period of the year lasts for 3.1 months, from June 12 to September 15. The month with the least rain in Oroville is July, with an average rainfall of 0.1 inches.

Average Monthly Rainfall in Oroville

Average Monthly Rainfall in OrovillerainrainJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inFeb 176.3 inFeb 176.3 inJul 290.0 inJul 290.0 inDec 166.0 inDec 166.0 inSep 150.5 inSep 150.5 inJun 120.5 inJun 120.5 inNowNow
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
JanFebMarAprMayJunJulAugSepOctNovDec
Rainfall 5.6″6.2″4.7″2.2″1.2″0.4″0.1″0.1″0.5″1.8″4.3″6.0″

The length of the day in Oroville varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 23 minutes of daylight; the longest day is June 20, with 14 hours, 58 minutes of daylight.

Hours of Daylight and Twilight in Oroville

Hours of Daylight and Twilight in OrovilleJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 8 minMar 1912 hr, 8 minMar 1914 hr, 58 minJun 2014 hr, 58 minJun 2012 hr, 10 minSep 2212 hr, 10 minSep 229 hr, 23 minDec 219 hr, 23 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
Hours ofJanFebMarAprMayJunJulAugSepOctNovDec
Daylight 9.7h10.7h12.0h13.3h14.4h14.9h14.6h13.6h12.4h11.1h10.0h9.4h

The earliest sunrise is at 5:38 AM on June 13, and the latest sunrise is 1 hour, 58 minutes later at 7:36 AM on November 2. The earliest sunset is at 4:42 PM on December 6, 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 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

Sunrise & Sunset with Twilight and Daylight Saving Time in Oroville

Sunrise & Sunset with Twilight and Daylight Saving Time in OrovilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 135:38 AMJun 135:38 AM8:37 PMJun 278:37 PMJun 27Dec 64:42 PMDec 64:42 PM7:36 AMNov 27:36 AMNov 2Mar 10DSTMar 10DSTDSTNov 3DSTNov 3daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in Oroville

Solar Elevation and Azimuth in OrovilleJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AM00010101010202020303030404040505060607000010101020202020303040405050602774NowNow
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in Oroville

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

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 in Oroville

Humidity Comfort Levels in OrovilleJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jan 90%Jan 90%Jul 291%Jul 291%NowNowcomfortablecomfortabledrydryhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.
JanFebMarAprMayJunJulAugSepOctNovDec
Muggy days 0.0d0.0d0.0d0.0d0.1d0.1d0.2d0.1d0.1d0.0d0.0d0.0d

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Oroville experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 4.6 months, from November 17 to April 5, with average wind speeds of more than 6.3 miles per hour. The windiest month of the year in Oroville is December, with an average hourly wind speed of 6.7 miles per hour.

The calmer time of year lasts for 7.4 months, from April 5 to November 17. The calmest month of the year in Oroville is June, with an average hourly wind speed of 5.8 miles per hour.

Average Wind Speed in Oroville

Average Wind Speed in OrovillewindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph1 mph1 mph2 mph2 mph3 mph3 mph4 mph4 mph5 mph5 mph6 mph6 mph7 mph7 mph8 mph8 mph9 mph9 mph10 mph10 mph11 mph11 mphDec 176.9 mphDec 176.9 mphMay 245.7 mphMay 245.7 mphApr 56.3 mphApr 56.3 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Wind Speed (mph) 6.66.76.56.15.85.86.16.15.85.96.36.7

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 22, with a peak percentage of 57% on July 29. The wind is most often from the east for 4.8 months, from September 22 to February 17, with a peak percentage of 46% on January 1.

Wind Direction in Oroville

Wind Direction in OrovilleESEJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowsoutheastnorthwest
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

To characterize how pleasant the weather is in Oroville throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Oroville for general outdoor tourist activities is from early June to late September, with a peak score in the third week of August.

Tourism Score in Oroville

Tourism Score in Orovillebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810108.38.30.50.5NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationtourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Oroville for hot-weather activities is from late June to mid August, with a peak score in the third week of July.

Beach/Pool Score in Oroville

Beach/Pool Score in Orovillebest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.76.70.00.0NowNowtemperaturetemperature cloudscloudsprecipitationprecipitationbeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in Oroville typically lasts for 12 months (359 days), from around January 5 to around December 30, rarely starting after February 17, or ending before November 23.

Time Spent in Various Temperature Bands and the Growing Season in Oroville

Time Spent in Various Temperature Bands and the Growing Season in Orovillegrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Jan 550%Jan 550%Dec 3050%Dec 3090%Feb 1790%Feb 1790%Nov 2390%Nov 23Jul 5100%Jul 5100%NowNowvery coldcoldcoolcomfortablewarmhotsweltering
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in Oroville should appear around February 14, only rarely appearing before February 2 or after February 29.

Growing Degree Days in Oroville

Growing Degree Days in OrovilleJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F1,000°F1,000°F2,000°F2,000°F3,000°F3,000°F4,000°F4,000°F5,000°F5,000°FFeb 1489°FFeb 1489°FMay 13900°FMay 13900°FJun 241,800°FJun 241,800°FDec 315,026°FDec 315,026°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

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 10 to August 23, with an average daily incident shortwave energy per square meter above 7.1 kWh. The brightest month of the year in Oroville is July, with an average of 8.3 kWh.

The darker period of the year lasts for 3.7 months, from November 1 to February 20, with an average daily incident shortwave energy per square meter below 3.2 kWh. The darkest month of the year in Oroville is December, with an average of 2.0 kWh.

Average Daily Incident Shortwave Solar Energy in Oroville

Average Daily Incident Shortwave Solar Energy in OrovillebrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJun 308.4 kWhJun 308.4 kWhDec 191.9 kWhDec 191.9 kWhMay 107.1 kWhMay 107.1 kWhAug 237.1 kWhAug 237.1 kWhNov 13.2 kWhNov 13.2 kWhFeb 203.2 kWhFeb 203.2 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.
JanFebMarAprMayJunJulAugSepOctNovDec
Solar Energy (kWh) 2.33.14.56.07.38.28.37.45.94.22.62.0

For the purposes of this report, the geographical coordinates of Oroville are 39.514 deg latitude, -121.558 deg longitude, and 161 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.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Oroville and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

Please review our full terms contained on our Terms of Service page.