Average Weather in Twentynine Palms California, United States
In Twentynine Palms, the summers are sweltering, the winters are cold, and it is dry and mostly clear year round. Over the course of the year, the temperature typically varies from 38°F to 102°F and is rarely below 30°F or above 108°F.
Based on the beach/pool score, the best time of year to visit Twentynine Palms for hot-weather activities is from mid June to mid September.
The hot season lasts for 3.5 months, from June 3 to September 18, with an average daily high temperature above 94°F. The hottest day of the year is July 14, with an average high of 102°F and low of 76°F.
The cool season lasts for 3.1 months, from November 20 to February 25, with an average daily high temperature below 69°F. The coldest day of the year is December 26, with an average low of 38°F and high of 60°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 Twentynine Palms, 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 Twentynine Palms begins around April 17 and lasts for 6.6 months, ending around November 5. On September 18, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 89% of the time, and overcast or mostly cloudy 11% of the time.
The cloudier part of the year begins around November 5 and lasts for 5.4 months, ending around April 17. On February 21, the cloudiest day of the year, the sky is overcast or mostly cloudy 39% of the time, and clear, mostly clear, or partly cloudy 61% 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 Twentynine Palms varies throughout the year.
The wetter season lasts 8.1 months, from July 21 to March 24, with a greater than 6% chance of a given day being a wet day. The chance of a wet day peaks at 11% on February 21.
The drier season lasts 3.9 months, from March 24 to July 21. The smallest chance of a wet day is 1% on June 13.
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 11% 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. Twentynine Palms experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 3.3 months, from December 6 to March 15, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 15, with an average total accumulation of 0.9 inches.
The rainless period of the year lasts for 8.7 months, from March 15 to December 6. The least rain falls around June 4, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Twentynine Palms varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 53 minutes of daylight; the longest day is June 21, with 14 hours, 26 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:32 AM on June 12, and the latest sunrise is 1 hour, 34 minutes later at 7:05 AM on November 3. The earliest sunset is at 4:34 PM on December 4, and the latest sunset is 3 hours, 25 minutes later at 7:59 PM on June 29.
Daylight saving time (DST) is observed in Twentynine Palms 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 Twentynine Palms, 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, staying within 3% of 3% throughout.
Humidity Comfort Levels
The average hourly wind speed in Twentynine Palms experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.0 months, from March 10 to July 10, with average wind speeds of more than 7.7 miles per hour. The windiest day of the year is April 25, with an average hourly wind speed of 8.9 miles per hour.
The calmer time of year lasts for 8.0 months, from July 10 to March 10. The calmest day of the year is September 4, with an average hourly wind speed of 6.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Twentynine Palms varies throughout the year.
The wind is most often from the west for 7.9 months, from February 19 to October 16, with a peak percentage of 60% on June 2. The wind is most often from the north for 4.1 months, from October 16 to February 19, with a peak percentage of 57% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Twentynine Palms 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 times of year to visit Twentynine Palms for general outdoor tourist activities are from late April to late June and from late August to mid October, with a peak score in the last week of September.
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 Twentynine Palms for hot-weather activities is from mid June to mid September, with a peak score in the first 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 Twentynine Palms typically lasts for 10 months (312 days), from around January 29 to around December 7, rarely starting after February 25, or ending before November 16.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Twentynine Palms should appear around January 25, only rarely appearing before January 17 or after February 6.
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 3.4 months, from April 22 to August 2, with an average daily incident shortwave energy per square meter above 7.6 kWh. The brightest day of the year is June 13, with an average of 8.7 kWh.
The darker period of the year lasts for 3.1 months, from November 5 to February 10, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest day of the year is December 22, with an average of 3.1 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Twentynine Palms are 34.136 deg latitude, -116.054 deg longitude, and 2,067 ft elevation.
The topography within 2 miles of Twentynine Palms contains very significant variations in elevation, with a maximum elevation change of 1,447 feet and an average elevation above sea level of 2,059 feet. Within 10 miles contains very significant variations in elevation (4,193 feet). Within 50 miles also contains extreme variations in elevation (11,719 feet).
The area within 2 miles of Twentynine Palms is covered by shrubs (93%), within 10 miles by shrubs (71%) and bare soil (29%), and within 50 miles by shrubs (77%) and bare soil (16%).
This report illustrates the typical weather in Twentynine Palms, 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 Twentynine Palms.
For each station, the records are corrected for the elevation difference between that station and Twentynine Palms 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 Twentynine Palms is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Twentynine Palms and a given station.
The stations contributing to this reconstruction are: Twenty-Nine Palms, Marine Corps Air-Ground Combat Center (76%, 21 kilometers, northwest); Palm Springs International Airport (11%, 54 kilometers, southwest); Thermal Airport (9%, 57 kilometers, south); and Needles Airport (3.8%, 149 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .