Average Weather in Mariposa California, United States
In Mariposa, the summers are hot, arid, and mostly clear and the winters are very cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 33°F to 89°F and is rarely below 25°F or above 96°F.
Based on the tourism score, the best time of year to visit Mariposa for warm-weather activities is from mid June to mid September.
The hot season lasts for 3.4 months, from June 8 to September 21, with an average daily high temperature above 81°F. The hottest day of the year is July 18, with an average high of 89°F and low of 60°F.
The cool season lasts for 3.1 months, from November 22 to February 27, with an average daily high temperature below 57°F. The coldest day of the year is December 30, with an average low of 33°F and high of 49°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 Mariposa, 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 Mariposa begins around May 15 and lasts for 5.4 months, ending around October 27. On August 8, 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 27 and lasts for 6.6 months, ending around May 15. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% 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 Mariposa varies significantly throughout the year.
The wetter season lasts 5.5 months, from November 1 to April 16, with a greater than 17% chance of a given day being a wet day. The chance of a wet day peaks at 32% on February 20.
The drier season lasts 6.5 months, from April 16 to November 1. The smallest chance of a wet day is 2% on August 9.
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. Mariposa experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.3 months, from September 25 to June 2, 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 4.6 inches.
The rainless period of the year lasts for 3.7 months, from June 2 to September 25. The least rain falls around August 16, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Mariposa varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 34 minutes of daylight; the longest day is June 21, with 14 hours, 45 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:38 AM on June 13, and the latest sunrise is 1 hour, 49 minutes later at 7:26 AM on November 3. The earliest sunset is at 4:41 PM on December 6, and the latest sunset is 3 hours, 43 minutes later at 8:25 PM on June 28.
Daylight saving time (DST) is observed in Mariposa 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 Mariposa, 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 Mariposa varies throughout the year.
The wind is most often from the west for 5.5 months, from March 29 to September 14, with a peak percentage of 48% on June 6. The wind is most often from the east for 6.5 months, from September 14 to March 29, with a peak percentage of 61% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Mariposa 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 Mariposa for general outdoor tourist activities is from mid June to mid September, with a peak score in the third week of July.
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 Mariposa for hot-weather activities is from late June to mid 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 Mariposa typically lasts for 7.5 months (229 days), from around March 30 to around November 14, rarely starting before February 24 or after April 22, and rarely ending before October 25 or after December 7.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Mariposa should appear around March 11, only rarely appearing before February 22 or after April 2.
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 8 to August 23, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest day of the year is June 26, with an average of 8.6 kWh.
The darker period of the year lasts for 3.5 months, from November 4 to February 17, with an average daily incident shortwave energy per square meter below 3.6 kWh. The darkest day of the year is December 22, with an average of 2.4 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Mariposa are 37.485 deg latitude, -119.966 deg longitude, and 2,316 ft elevation.
The topography within 2 miles of Mariposa contains very significant variations in elevation, with a maximum elevation change of 1,614 feet and an average elevation above sea level of 2,305 feet. Within 10 miles contains very significant variations in elevation (4,767 feet). Within 50 miles also contains extreme variations in elevation (12,956 feet).
The area within 2 miles of Mariposa is covered by shrubs (49%) and grassland (45%), within 10 miles by shrubs (54%) and grassland (36%), and within 50 miles by grassland (26%) and shrubs (25%).
This report illustrates the typical weather in Mariposa, 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 Mariposa.
For each station, the records are corrected for the elevation difference between that station and Mariposa 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 Mariposa is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Mariposa and a given station.
The stations contributing to this reconstruction are: Merced Municipal Airport (27%, 53 kilometers, southwest); Castle Airport (27%, 54 kilometers, west); Madera Municipal Airport (27%, 57 kilometers, south); Mammoth Lakes Airport (9%, 100 kilometers, east); and Bridgeport Sonora Junction (9%, 105 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .