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Average Weather at Imperial County Airport California, United States

At Imperial County Airport, 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 42°F to 107°F and is rarely below 35°F or above 113°F.

Climate Summary

comfortablewarmhotswelteringhotwarmJanFebMarAprMayJunJulAugSepOctNovDec90%90%65%65%clearovercastprecipitation: 0.8 inprecipitation: 0.8 in0.0 in0.0 inmuggy: 36%muggy: 36%0%0%drydrybeach/pool score: 7.5beach/pool score: 7.50.50.5
Click on each chart for more information.

Based on the beach/pool score, the best times of year to visit Imperial County Airport for hot-weather activities are from early June to late July and from mid August to late September.

Temperature

The hot season lasts for 3.6 months, from June 4 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 20 to February 25, with an average daily high temperature below 76°F. The coldest day of the year is January 1, with an average low of 42°F and high of 68°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature at Imperial County AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM4 AM8 AM12 PM4 PM8 PM12 AMcoldcoldcoldcoldcoolcoolcoolcoolcomfortablewarmhothotswelteringcomfortablevery coldvery cold
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Tindouf, Algeria (6,111 miles away) is the far-away foreign place with temperatures most similar to Imperial County Airport (view comparison).

Clouds

At Imperial County Airport, 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 at Imperial County Airport begins around April 5 and lasts for 7.0 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 5.0 months, ending around April 5. 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

Cloud Cover Categories at Imperial County AirportclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 1890%Sep 1890%Feb 2065%Feb 2065%Apr 577%Apr 577%Nov 377%Nov 377%clearovercastmostly clearmostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at Imperial County Airport varies throughout the year.

The wetter season lasts 4.3 months, from November 22 to March 30, 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 17.

The drier season lasts 7.7 months, from March 30 to November 22. 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 17.

Daily Chance of Precipitation

Daily Chance of Precipitation at Imperial County AirportwetwetdryJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Feb 1711%Feb 1711%Jun 131%Jun 131%Jan 19%Jan 19%Nov 226%Nov 226%Mar 306%Mar 306%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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. Imperial County Airport experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 3.4 months, from December 3 to March 17, 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 0.8 inches.

The rainless period of the year lasts for 8.6 months, from March 17 to December 3. The least rain falls around June 13, with an average total accumulation of 0.0 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Sun

The length of the day at Imperial County Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 59 minutes of daylight; the longest day is June 20, with 14 hours, 19 minutes of daylight.

Hours of Daylight and Twilight

Hours of Daylight and Twilight at Imperial County AirportJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2014 hr, 19 minJun 2014 hr, 19 minJun 2012 hr, 8 minSep 2212 hr, 8 minSep 229 hr, 59 minDec 219 hr, 59 minDec 21nightnightday
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:33 AM on June 12, and the latest sunrise is 1 hour, 29 minutes later at 7:03 AM on November 4. The earliest sunset is at 4:35 PM on December 4, and the latest sunset is 3 hours, 19 minutes later at 7:54 PM on June 29.

Daylight saving time (DST) is observed at Imperial County Airport during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time at Imperial County AirportJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 125:33 AMJun 125:33 AM7:54 PMJun 297:54 PMJun 29Dec 44:35 PMDec 44:35 PM7:03 AMNov 47:03 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Imperial County Airport experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.9 months, from June 27 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 9% of the time. The muggiest day of the year is August 12, with muggy conditions 36% of the time.

The least muggy day of the year is December 12, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels at Imperial County AirportmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%10%20%30%40%50%60%70%80%90%100%Dec 120%Dec 120%Aug 1236%Aug 1236%Jun 279%Jun 279%Sep 249%Sep 249%muggymuggydrydryoppressiveoppressivehumidhumidcomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed at Imperial County Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 3.9 months, from March 16 to July 13, with average wind speeds of more than 8.0 miles per hour. The windiest day of the year is May 7, with an average hourly wind speed of 9.7 miles per hour.

The calmer time of year lasts for 8.1 months, from July 13 to March 16. The calmest day of the year is January 11, with an average hourly wind speed of 6.4 miles per hour.

Average Wind Speed

Average Wind Speed at Imperial County AirportwindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph2 mph4 mph6 mph8 mph10 mph12 mph14 mph16 mphMay 79.7 mphMay 79.7 mphJan 116.4 mphJan 116.4 mphMar 168.0 mphMar 168.0 mphJul 138.0 mphJul 138.0 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction at Imperial County Airport varies throughout the year.

The wind is most often from the west for 9.0 months, from February 7 to November 8, with a peak percentage of 72% on May 22. The wind is most often from the north for 3.0 months, from November 8 to February 7, with a peak percentage of 58% on January 1.

Wind Direction

Wind Direction at Imperial County AirportNWNJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%westnortheastsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is at Imperial County Airport 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 Imperial County Airport for general outdoor tourist activities are from early April to late June and from mid September to late October, with a peak score in the second week of May.

Tourism Score

Tourism Score at Imperial County Airportbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.47.42.82.87.47.44.74.7 precipitationprecipitationcloudscloudstemperaturetemperaturetourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

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 Imperial County Airport for hot-weather activities are from early June to late July and from mid August to late September, with a peak score in the last week of June.

Beach/Pool Score

Beach/Pool Score at Imperial County Airportbest timebest timeJanFebMarAprMayJunJulAugSepOctNovDec02468107.57.50.50.57.27.26.66.6 precipitationprecipitationcloudscloudstemperaturetemperaturebeach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

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.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

While it does not do so every year, freezing temperatures are seen at Imperial County Airport over some winters. The day least likely to be in the growing season is December 31, with a 62% chance.

Time Spent in Various Temperature Bands and the Growing Season

Time Spent in Various Temperature Bands and the Growing Season at Imperial County Airportgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%90%Feb 1290%Feb 1290%Dec 390%Dec 362%Jan 162%Jan 1Jul 17100%Jul 17100%coldcoolwarmhotswelteringvery coldcomfortable
The percentage of time spent in various temperature bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms at Imperial County Airport should appear around January 14, only rarely appearing before January 11 or after January 18.

Growing Degree Days

Growing Degree Days at Imperial County AirportJanFebMarAprMayJunJulAugSepOctNovDec0°F1,000°F2,000°F3,000°F4,000°F5,000°F6,000°F7,000°F8,000°FJan 1490°FJan 1490°FMar 27900°FMar 27900°FMay 91,800°FMay 91,800°FDec 317,805°FDec 317,805°F
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

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 19 to August 1, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest day of the year is June 12, 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

Average Daily Incident Shortwave Solar Energy at Imperial County AirportbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWh10 kWhJun 128.6 kWhJun 128.6 kWhDec 223.3 kWhDec 223.3 kWhApr 197.5 kWhApr 197.5 kWhAug 17.5 kWhAug 17.5 kWhNov 54.3 kWhNov 54.3 kWhFeb 84.3 kWhFeb 84.3 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Imperial County Airport are 32.834 deg latitude, -115.579 deg longitude, and -52 ft elevation.

The topography within 2 miles of Imperial County Airport is essentially flat, with a maximum elevation change of 20 feet and an average elevation above sea level of -51 feet. Within 10 miles is essentially flat (305 feet). Within 50 miles contains only modest variations in elevation (6,565 feet).

The area within 2 miles of Imperial County Airport is covered by cropland (59%) and shrubs (39%), within 10 miles by cropland (86%), and within 50 miles by shrubs (50%) and bare soil (21%).

Data Sources

This report illustrates the typical weather at Imperial County Airport, 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

Imperial County Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to El Centro, Naval Air Facility; Campo; Yuma International Airport; Thermal Airport; Yuma International Airport; Blythe Airport; Ramona Airport; and Palm Springs International Airport.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.