Average Weather in Twain Harte California, United States
In Twain Harte, the summers are warm, arid, and mostly clear and the winters are long, very cold, wet, and partly cloudy. Over the course of the year, the temperature typically varies from 31°F to 85°F and is rarely below 22°F or above 91°F.
Based on the tourism score, the best time of year to visit Twain Harte for warm-weather activities is from late June to early September.
The warm season lasts for 3.2 months, from June 12 to September 20, with an average daily high temperature above 77°F. The hottest day of the year is July 28, with an average high of 85°F and low of 56°F.
The cold season lasts for 3.7 months, from November 20 to March 12, with an average daily high temperature below 55°F. The coldest day of the year is December 23, with an average low of 31°F and high of 48°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 Twain Harte, 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 Twain Harte begins around May 21 and lasts for 5.1 months, ending around October 25. 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 25 and lasts for 6.9 months, ending around May 21. 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 Twain Harte varies significantly throughout the year.
The wetter season lasts 5.7 months, from November 1 to April 23, with a greater than 16% chance of a given day being a wet day. The chance of a wet day peaks at 32% on February 21.
The drier season lasts 6.3 months, from April 23 to November 1. The smallest chance of a wet day is 0% on August 5.
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 27% on February 21.
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. Twain Harte experiences extreme seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.3 months, from September 23 to June 3, 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 4.3 inches.
The rainless period of the year lasts for 3.7 months, from June 3 to September 23. The least rain falls around August 11, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The sliding 31-day liquid-equivalent quantity of snowfall in Twain Harte does not vary significantly over the course of the year, staying within 0.1 inches of 0.1 inches throughout.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Twain Harte varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 31 minutes of daylight; the longest day is June 21, with 14 hours, 49 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:37 AM on June 14, and the latest sunrise is 1 hour, 51 minutes later at 7:28 AM on November 3. The earliest sunset is at 4:41 PM on December 6, and the latest sunset is 3 hours, 47 minutes later at 8:27 PM on June 28.
Daylight saving time (DST) is observed in Twain Harte 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 Twain Harte, 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 Twain Harte varies throughout the year.
The wind is most often from the south for 1.4 months, from February 18 to March 29, with a peak percentage of 38% on February 20. The wind is most often from the west for 5.8 months, from March 29 to September 23, with a peak percentage of 47% on June 7. The wind is most often from the east for 4.8 months, from September 23 to February 18, with a peak percentage of 47% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Twain Harte 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 Twain Harte for general outdoor tourist activities is from late June to early 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 Twain Harte for hot-weather activities is from early July 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 Twain Harte typically lasts for 6.4 months (195 days), from around April 20 to around November 1, rarely starting before March 26 or after May 13, and rarely ending before October 9 or after November 24.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Twain Harte should appear around March 29, only rarely appearing before March 10 or after April 24.
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 7.4 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 3 to February 16, 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 2.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Twain Harte are 38.040 deg latitude, -120.233 deg longitude, and 3,727 ft elevation.
The topography within 2 miles of Twain Harte contains very significant variations in elevation, with a maximum elevation change of 1,785 feet and an average elevation above sea level of 3,811 feet. Within 10 miles contains very significant variations in elevation (5,118 feet). Within 50 miles also contains extreme variations in elevation (12,208 feet).
The area within 2 miles of Twain Harte is covered by trees (51%) and shrubs (49%), within 10 miles by trees (48%) and shrubs (47%), and within 50 miles by shrubs (31%) and trees (31%).
This report illustrates the typical weather in Twain Harte, 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 Twain Harte.
For each station, the records are corrected for the elevation difference between that station and Twain Harte 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 Twain Harte is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Twain Harte and a given station.
The stations contributing to this reconstruction are: Bridgeport Sonora Junction (21%, 72 kilometers, northeast); Modesto City-County Airport (16%, 78 kilometers, southwest); Castle Airport (17%, 79 kilometers, south); Placerville Airport (28%, 88 kilometers, northwest); and Lake Tahoe Airport (18%, 98 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .