Average Weather in Alta Sierra California, United States
In Alta Sierra, the summers are warm, arid, and clear and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 24°F to 80°F and is rarely below 17°F or above 87°F.
Based on the tourism score, the best time of year to visit Alta Sierra for warm-weather activities is from late June to late August.
The warm season lasts for 3.2 months, from June 12 to September 20, with an average daily high temperature above 73°F. The hottest day of the year is July 27, with an average high of 80°F and low of 53°F.
The cold season lasts for 3.7 months, from November 18 to March 8, with an average daily high temperature below 50°F. The coldest day of the year is December 25, with an average low of 24°F and high of 43°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 Alta Sierra, 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 Alta Sierra begins around May 7 and lasts for 5.9 months, ending around November 2. On August 9, 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 November 2 and lasts for 6.1 months, ending around May 7. On February 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 49% of the time, and clear, mostly clear, or partly cloudy 51% 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 Alta Sierra varies throughout the year.
The wetter season lasts 5.0 months, from November 10 to April 9, with a greater than 10% chance of a given day being a wet day. The chance of a wet day peaks at 20% on February 21.
The drier season lasts 7.0 months, from April 9 to November 10. The smallest chance of a wet day is 0% on June 27.
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 in Alta Sierra changes throughout the year.
Rain alone is the most common for 11 months, from January 11 to December 17. The highest chance of a day with rain alone is 12% on February 20.
Mixed snow and rain is the most common for 3.6 weeks, from December 17 to January 11. The highest chance of a day with mixed snow and rain is 8% on December 26.
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. Alta Sierra experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 5.6 months, from October 28 to April 15, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 27, with an average total accumulation of 1.2 inches.
The rainless period of the year lasts for 6.4 months, from April 15 to October 28. The least rain falls around July 7, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Alta Sierra experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.3 months, from November 8 to April 17, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 6, with an average total liquid-equivalent accumulation of 0.5 inches.
The snowless period of the year lasts for 6.7 months, from April 17 to November 8. The least snow falls around August 1, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Alta Sierra varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 44 minutes of daylight; the longest day is June 21, with 14 hours, 35 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:37 AM on June 13, and the latest sunrise is 1 hour, 41 minutes later at 7:18 AM on November 3. The earliest sunset is at 4:40 PM on December 5, and the latest sunset is 3 hours, 34 minutes later at 8:14 PM on June 29.
Daylight saving time (DST) is observed in Alta Sierra 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 Alta Sierra, 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 Alta Sierra experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 3.9 months, from March 13 to July 9, with average wind speeds of more than 6.1 miles per hour. The windiest day of the year is May 6, with an average hourly wind speed of 7.0 miles per hour.
The calmer time of year lasts for 8.1 months, from July 9 to March 13. The calmest day of the year is September 17, with an average hourly wind speed of 5.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Alta Sierra varies throughout the year.
The wind is most often from the west for 8.0 months, from February 18 to October 18, with a peak percentage of 64% on June 2. The wind is most often from the east for 4.0 months, from October 18 to February 18, with a peak percentage of 50% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Alta Sierra 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 Alta Sierra for general outdoor tourist activities is from late June to late August, 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 Alta Sierra for hot-weather activities is from early July to mid August, with a peak score in the last 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 Alta Sierra typically lasts for 5.0 months (152 days), from around May 13 to around October 12, rarely starting before April 19 or after June 6, and rarely ending before September 19 or after November 5.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Alta Sierra should appear around April 21, only rarely appearing before April 3 or after May 13.
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 3.6 months, from May 3 to August 21, with an average daily incident shortwave energy per square meter above 7.6 kWh. The brightest day of the year is June 21, with an average of 8.8 kWh.
The darker period of the year lasts for 3.3 months, from November 5 to February 14, with an average daily incident shortwave energy per square meter below 4.0 kWh. The darkest day of the year is December 23, with an average of 2.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Alta Sierra are 35.731 deg latitude, -118.554 deg longitude, and 5,699 ft elevation.
The topography within 2 miles of Alta Sierra contains large variations in elevation, with a maximum elevation change of 2,979 feet and an average elevation above sea level of 5,902 feet. Within 10 miles contains large variations in elevation (5,978 feet). Within 50 miles also contains extreme variations in elevation (12,159 feet).
The area within 2 miles of Alta Sierra is covered by trees (87%) and shrubs (13%), within 10 miles by shrubs (57%) and trees (25%), and within 50 miles by shrubs (42%) and grassland (21%).
This report illustrates the typical weather in Alta Sierra, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Alta Sierra.
For each station, the records are corrected for the elevation difference between that station and Alta Sierra 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 Alta Sierra is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Alta Sierra and a given station.
The stations contributing to this reconstruction are: Meadows Field (16%, 56 kilometers, southwest); Porterville Municipal Airport (16%, 57 kilometers, northwest); Tehachapi Municipal Airport (45%, 67 kilometers, south); and Ridgecrest Community Hospital Heliport (23%, 78 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .