Average Weather in Copperopolis California, United States
In Copperopolis, 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 39°F to 93°F and is rarely below 31°F or above 101°F.
Based on the tourism score, the best time of year to visit Copperopolis for warm-weather activities is from mid June to late September.
The hot season lasts for 3.4 months, from June 8 to September 20, with an average daily high temperature above 85°F. The hottest day of the year is July 18, with an average high of 93°F and low of 66°F.
The cool season lasts for 3.1 months, from November 20 to February 23, with an average daily high temperature below 60°F. The coldest day of the year is December 30, with an average low of 39°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 Copperopolis, 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 Copperopolis begins around May 16 and lasts for 5.3 months, ending around October 25. 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 25 and lasts for 6.7 months, ending around May 16. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Copperopolis varies significantly throughout the year.
The wetter season lasts 5.6 months, from November 1 to April 18, with a greater than 16% chance of a given day being a wet day. The chance of a wet day peaks at 31% on February 20.
The drier season lasts 6.4 months, from April 18 to November 1. The smallest chance of a wet day is 0% on August 17.
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 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. Copperopolis experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.1 months, from September 27 to May 29, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 16, with an average total accumulation of 4.1 inches.
The rainless period of the year lasts for 3.9 months, from May 29 to September 27. The least rain falls around August 7, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Copperopolis varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 32 minutes of daylight; the longest day is June 21, with 14 hours, 48 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:39 AM on June 13, and the latest sunrise is 1 hour, 51 minutes later at 7:30 AM on November 3. The earliest sunset is at 4:42 PM on December 6, and the latest sunset is 3 hours, 46 minutes later at 8:29 PM on June 28.
Daylight saving time (DST) is observed in Copperopolis during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Copperopolis, 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
The average hourly wind speed in Copperopolis experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.1 months, from November 21 to March 23, with average wind speeds of more than 5.5 miles per hour. The windiest day of the year is February 20, with an average hourly wind speed of 6.1 miles per hour.
The calmer time of year lasts for 7.9 months, from March 23 to November 21. The calmest day of the year is September 18, with an average hourly wind speed of 5.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Copperopolis varies throughout the year.
The wind is most often from the south for 3.1 weeks, from February 22 to March 16, with a peak percentage of 31% on February 22. The wind is most often from the west for 7.3 months, from March 16 to October 24, with a peak percentage of 65% on July 21. The wind is most often from the east for 3.9 months, from October 24 to February 22, with a peak percentage of 44% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Copperopolis 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 Copperopolis for general outdoor tourist activities is from mid June to late September, with a peak score in the second week of August.
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 Copperopolis for hot-weather activities is from late June to late August, with a peak score in the third week of July.
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.
The growing season in Copperopolis typically lasts for 10 months (311 days), from around January 30 to around December 7, rarely starting after March 6, or ending before November 14.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Copperopolis should appear around February 21, only rarely appearing before February 7 or after March 10.
Growing Degree Days
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 9 to August 24, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is June 25, with an average of 8.5 kWh.
The darker period of the year lasts for 3.6 months, from November 3 to February 19, with an average daily incident shortwave energy per square meter below 3.5 kWh. The darkest day of the year is December 21, with an average of 2.2 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Copperopolis are 37.981 deg latitude, -120.642 deg longitude, and 1,014 ft elevation.
The topography within 2 miles of Copperopolis contains very significant variations in elevation, with a maximum elevation change of 1,037 feet and an average elevation above sea level of 1,094 feet. Within 10 miles contains very significant variations in elevation (2,671 feet). Within 50 miles contains large variations in elevation (9,790 feet).
The area within 2 miles of Copperopolis is covered by grassland (99%), within 10 miles by grassland (81%) and shrubs (12%), and within 50 miles by grassland (28%) and cropland (28%).
This report illustrates the typical weather in Copperopolis, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Copperopolis.
For each station, the records are corrected for the elevation difference between that station and Copperopolis 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 Copperopolis is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Copperopolis and a given station.
The stations contributing to this reconstruction are: Modesto City-County Airport (34%, 48 kilometers, southwest); Stockton Metropolitan Airport (30%, 52 kilometers, west); Placerville Airport (15%, 82 kilometers, north); Sacramento Mather Airport (16%, 87 kilometers, northwest); and Bridgeport Sonora Junction (4.8%, 107 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .