Average Weather in Holtville California, United States
In Holtville, the summers are sweltering and arid, the winters are cool and dry, and it is mostly clear year round. Over the course of the year, the temperature typically varies from 43°F to 107°F and is rarely below 35°F or above 112°F.
Based on the beach/pool score, the best times of year to visit Holtville for hot-weather activities are from late May to mid July and from late August to late September.
The hot season lasts for 3.6 months, from June 3 to September 22, with an average daily high temperature above 99°F. The hottest day of the year is July 23, with an average high of 107°F and low of 80°F.
The cool season lasts for 3.1 months, from November 21 to February 24, with an average daily high temperature below 76°F. The coldest day of the year is December 28, with an average low of 43°F and high of 68°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 Holtville, 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 Holtville begins around April 6 and lasts for 6.9 months, ending around November 3. On September 18, 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 November 3 and lasts for 5.1 months, ending around April 6. On February 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 35% of the time, and clear, mostly clear, or partly cloudy 65% of the time.
Cloud Cover Categories
Holtville does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 0% to 10%, with an average value of 4%.
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 10% 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. Holtville experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 2.9 months, from December 13 to March 9, 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 0.7 inches.
The rainless period of the year lasts for 9.1 months, from March 9 to December 13. The least rain falls around June 13, with an average total accumulation of 0.0 inches.
Average Monthly Rainfall
The length of the day in Holtville varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 59 minutes of daylight; the longest day is June 21, with 14 hours, 19 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:32 AM on June 11, and the latest sunrise is 1 hour, 28 minutes later at 7:01 AM on November 3. The earliest sunset is at 4:34 PM on December 4, and the latest sunset is 3 hours, 19 minutes later at 7:53 PM on June 29.
Daylight saving time (DST) is observed in Holtville 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
Holtville experiences significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 2.9 months, from June 26 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 11% of the time. The muggiest day of the year is August 12, with muggy conditions 43% of the time.
The least muggy day of the year is December 13, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Holtville experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 3.4 months, from March 17 to June 29, with average wind speeds of more than 7.5 miles per hour. The windiest day of the year is May 3, with an average hourly wind speed of 8.7 miles per hour.
The calmer time of year lasts for 8.6 months, from June 29 to March 17. The calmest day of the year is August 23, with an average hourly wind speed of 6.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Holtville varies throughout the year.
The wind is most often from the west for 8.3 months, from February 17 to October 26, with a peak percentage of 69% on May 22. The wind is most often from the north for 3.7 months, from October 26 to February 17, with a peak percentage of 62% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Holtville 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 Holtville for general outdoor tourist activities are from early April to mid June and from late September to early November, with a peak score in the second week of May.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best times of year to visit Holtville for hot-weather activities are from late May to mid July and from late August to late September, with a peak score in the last week of June.
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.
While it does not do so every year, freezing temperatures are seen in Holtville over some winters. The day least likely to be in the growing season is January 4, with a 76% chance.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Holtville should appear around January 14, only rarely appearing before January 10 or after January 18.
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 3.3 months, from April 19 to July 29, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest day of the year is June 13, with an average of 8.6 kWh.
The darker period of the year lasts for 3.1 months, from November 5 to February 8, 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 3.3 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Holtville are 32.811 deg latitude, -115.380 deg longitude, and -13 ft elevation.
The topography within 2 miles of Holtville is essentially flat, with a maximum elevation change of 75 feet and an average elevation above sea level of -13 feet. Within 10 miles is essentially flat (233 feet). Within 50 miles contains only modest variations in elevation (5,935 feet).
The area within 2 miles of Holtville is covered by cropland (93%), within 10 miles by cropland (81%) and shrubs (17%), and within 50 miles by shrubs (50%) and cropland (23%).
This report illustrates the typical weather in Holtville, 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Holtville.
For each station, the records are corrected for the elevation difference between that station and Holtville 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 Holtville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Holtville and a given station.
The stations contributing to this reconstruction are: Imperial County Airport (57%, 19 kilometers, west); General Rodolfo Sánchez Taboada International Airport (39%, 24 kilometers, southeast); and Blythe Airport (4.0%, 109 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .