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December Weather in Imperial California, United States

Daily high temperatures decrease by 4°F, from 72°F to 68°F, rarely falling below 60°F or exceeding 79°F. The lowest daily average high temperature is 68°F on December 24.

Daily low temperatures decrease by 3°F, from 45°F to 42°F, rarely falling below 34°F or exceeding 54°F. The lowest daily average low temperature is 42°F on December 31.

For reference, on July 21, the hottest day of the year, temperatures in Imperial typically range from 80°F to 107°F, while on December 31, the coldest day of the year, they range from 42°F to 68°F.

Average High and Low Temperature in December in Imperial

Average High and Low Temperature in December in ImperialDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313130°F30°F35°F35°F40°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°FNovJanDec 2368°FDec 2368°F42°F42°FDec 172°FDec 172°F45°F45°FDec 1169°FDec 1169°F43°F43°F
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 hourly average temperatures for the quarter of the year centered on December. The horizontal axis is the day, 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 December in Imperial

Average Hourly Temperature in December in ImperialDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJanvery coldcoldcoldcoolcoolcomfortablewarm
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Tindouf, Algeria (6,110 miles away) is the far-away foreign place with temperatures most similar to Imperial (view comparison).

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The month of December in Imperial experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 30% throughout the month. The highest chance of overcast or mostly cloudy conditions is 32% on December 27.

The clearest day of the month is December 8, with clear, mostly clear, or partly cloudy conditions 71% of the time.

For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 35%, while on September 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.

Cloud Cover Categories in December in Imperial

Cloud Cover Categories in December in ImperialDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanSep 1790%Sep 1790%Dec 171%Dec 171%Dec 3169%Dec 3169%Dec 1171%Dec 1171%Dec 2168%Dec 2168%clearmostly clearovercastpartly cloudymostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Imperial, the chance of a wet day over the course of December is essentially constant, remaining around 8% throughout.

For reference, the year's highest daily chance of a wet day is 11% on February 17, and its lowest chance is 1% on June 25.

Probability of Precipitation in December in Imperial

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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in Imperial is essentially constant, remaining about 0.6 inches throughout, and rarely exceeding 1.9 inches.

Average Monthly Rainfall in December in Imperial

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 snowfall.

Over the course of December in Imperial, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 59 minutes of daylight and the longest day is December 1, with 10 hours, 8 minutes of daylight.

Hours of Daylight and Twilight in December in Imperial

Hours of Daylight and Twilight in December in ImperialDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 59 minDec 219 hr, 59 minnightnightdaydayDec 110 hr, 8 minDec 110 hr, 8 min
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 of the month in Imperial is 6:27 AM on December 1 and the latest sunrise is 17 minutes later at 6:44 AM on December 31.

The earliest sunset is 4:35 PM on December 3 and the latest sunset is 11 minutes later at 4:46 PM on December 31.

Daylight saving time is observed in Imperial during 2024, but it neither starts nor ends during December, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:34 AM and sets 14 hours, 19 minutes later, at 7:53 PM, while on December 21, the shortest day of the year, it rises at 6:41 AM and sets 9 hours, 59 minutes later, at 4:40 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Imperial

Sunrise & Sunset with Twilight and Daylight Saving Time in December in ImperialDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan6:27 AM6:27 AMDec 14:35 PMDec 14:35 PM6:44 AM6:44 AMDec 314:46 PMDec 314:46 PM6:35 AM6:35 AMDec 114:36 PMDec 114:36 PM6:41 AM6:41 AMDec 214:40 PMDec 214:40 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day over the course of December. 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 figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in December in Imperial

Solar Elevation and Azimuth in December in ImperialDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMNovJan0010102020303000101020203030
northeastsouthwest
Solar elevation and azimuth over the course of December 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for December 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in December in Imperial

Moon Rise, Set & Phases in December in ImperialDec112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNovJanNov 15:48 AMNov 15:48 AMNov 151:29 PMNov 151:29 PMNov 3010:22 PMNov 3010:22 PMDec 151:02 AMDec 151:02 AMDec 302:28 PMDec 302:28 PMJan 132:28 PMJan 132:28 PMJan 294:37 AMJan 294:37 AM7:11 AM7:11 AM5:50 PM5:50 PM4:26 PM4:26 PM7:17 AM7:17 AM6:03 AM6:03 AM4:02 PM4:02 PM3:53 PM3:53 PM7:13 AM7:13 AM6:50 AM6:50 AM4:31 PM4:31 PM4:48 PM4:48 PM7:37 AM7:37 AM7:02 AM7:02 AM5:37 PM5:37 PM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Dec 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
0%7:04 AMESE4:48 PMSW-11:56 AMS245,139 mi
2
3%8:03 AMSE5:41 PMSW-12:52 PMS243,048 mi
3
7%8:58 AMSE6:42 PMWSW-1:50 PMS240,912 mi
4
14%9:47 AMESE7:47 PMWSW-2:47 PMS238,765 mi
5
22%10:29 AMESE8:53 PMWSW-3:41 PMS236,626 mi
6
32%11:05 AMESE10:00 PMWSW-4:32 PMS234,514 mi
7
44%11:37 AMESE11:06 PMW-5:21 PMS232,469 mi
8
50%12:07 PME--6:08 PMS230,566 mi
9
67%-12:12 AMW12:36 PME6:55 PMS228,926 mi
10
78%-1:19 AMW1:06 PME7:44 PMS227,704 mi
11
87%-2:27 AMWNW1:39 PMENE8:35 PMS227,076 mi
12
94%-3:39 AMWNW2:16 PMENE9:30 PMS227,198 mi
13
98%-4:52 AMWNW3:01 PMENE10:30 PMS228,176 mi
14
100%-6:05 AMWNW3:53 PMENE11:32 PMS230,017 mi
15
100%-7:13 AMNW4:54 PMNE--
16
99%-8:13 AMWNW6:00 PMENE12:35 AMS232,618 mi
17
95%-9:03 AMWNW7:07 PMENE1:34 AMS235,769 mi
18
89%-9:44 AMWNW8:12 PMENE2:29 AMS239,194 mi
19
81%-10:17 AMWNW9:14 PMENE3:18 AMS242,595 mi
20
73%-10:46 AMWNW10:12 PME4:03 AMS245,692 mi
21
63%-11:12 AMW11:08 PME4:44 AMS248,250 mi
22
50%-11:36 AMW-5:23 AMS250,096 mi
23
44%12:03 AME11:59 AMW-6:02 AMS251,124 mi
24
35%12:57 AME12:24 PMWSW-6:41 AMS251,299 mi
25
26%1:53 AMESE12:51 PMWSW-7:22 AMS250,654 mi
26
18%2:51 AMESE1:22 PMWSW-8:06 AMS249,283 mi
27
11%3:50 AMESE1:58 PMWSW-8:54 AMS247,330 mi
28
5%4:52 AMESE2:41 PMWSW-9:46 AMS244,979 mi
29
1%5:53 AMSE3:32 PMSW-10:42 AMS242,429 mi
30
0%6:50 AMSE4:31 PMSW-11:41 AMS239,879 mi
31
1%7:42 AMESE5:36 PMWSW-12:39 PMS237,499 mi

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.

The chance that a given day will be muggy in Imperial is essentially constant during December, remaining around 0% throughout.

For reference, on August 11, the muggiest day of the year, there are muggy conditions 37% of the time, while on November 20, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December in Imperial

Humidity Comfort Levels in December in ImperialDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%NovJanDec 10%Dec 10%Dec 310%Dec 310%Dec 110%Dec 110%Dec 210%Dec 210%drydry
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 in Imperial is essentially constant during December, remaining within 0.1 miles per hour of 6.6 miles per hour throughout.

For reference, on May 6, the windiest day of the year, the daily average wind speed is 9.6 miles per hour, while on January 11, the calmest day of the year, the daily average wind speed is 6.5 miles per hour.

Average Wind Speed in December in Imperial

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Imperial throughout December is predominantly from the north, with a peak proportion of 58% on December 30.

Wind Direction in December in Imperial

Wind Direction in December in ImperialWNDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%NovJanwestnortheastsouth
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 in Imperial over some winters. The day least likely to be in the growing season is January 1, with a 63% chance.

Time Spent in Various Temperature Bands and the Growing Season in December in Imperial

Time Spent in Various Temperature Bands and the Growing Season in December in Imperialgrowing seasonDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJan92%Dec 192%Dec 163%Dec 3163%Dec 3180%Dec 1180%Dec 1167%Dec 2167%Dec 21very coldcoldcoolcomfortablewarmhot
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 percentage of time spent in various temperature bands. 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.

The average accumulated growing degree days in Imperial are increasing during December, increasing by 202°F, from 7,603°F to 7,805°F, over the course of the month.

Growing Degree Days in December in Imperial

The average growing degree days accumulated over the course of December, with 25th to 75th and 10th to 90th percentile bands.

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 in Imperial is essentially constant during December, remaining within 0.1 kWh of 3.4 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 3.3 kWh on December 21.

Average Daily Incident Shortwave Solar Energy in December in Imperial

Average Daily Incident Shortwave Solar Energy in December in ImperialDec11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.0 kWh0.5 kWh0.5 kWh1.0 kWh1.0 kWh1.5 kWh1.5 kWh2.0 kWh2.0 kWh2.5 kWh2.5 kWh3.0 kWh3.0 kWh3.5 kWh3.5 kWh4.0 kWh4.0 kWh4.5 kWh4.5 kWh5.0 kWh5.0 kWhNovJanDec 213.3 kWhDec 213.3 kWhDec 13.5 kWhDec 13.5 kWhDec 313.3 kWhDec 313.3 kWhDec 113.3 kWhDec 113.3 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.

For the purposes of this report, the geographical coordinates of Imperial are 32.848 deg latitude, -115.569 deg longitude, and -56 ft elevation.

The topography within 2 miles of Imperial is essentially flat, with a maximum elevation change of 23 feet and an average elevation above sea level of -56 feet. Within 10 miles is essentially flat (308 feet). Within 50 miles contains only modest variations in elevation (6,565 feet).

The area within 2 miles of Imperial is covered by cropland (71%) and shrubs (29%), within 10 miles by cropland (85%), and within 50 miles by shrubs (50%) and bare soil (20%).

This report illustrates the typical weather in Imperial, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Imperial.

For each station, the records are corrected for the elevation difference between that station and Imperial 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 Imperial is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Imperial and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Imperial and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

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.

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