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Average Weather in December in Templeton California, United States

The lowest daily average high temperature is 59°F on December 28.

Daily low temperatures are around 38°F, rarely falling below 29°F or exceeding 49°F. The lowest daily average low temperature is 37°F on December 30.

For reference, on August 22, the hottest day of the year, temperatures in Templeton typically range from 53°F to 85°F, while on December 30, the coldest day of the year, they range from 37°F to 59°F.

Average High and Low Temperature in December

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

Average Hourly Temperature in December in Templeton18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMNovJanvery coldcoldcoldcoolcomfortablevery 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.

Peñaflor, Chile (5,767 miles away) is the far-away foreign place with temperatures most similar to Templeton (view comparison).

Clouds

The month of December in Templeton experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 47%. The highest chance of overcast or mostly cloudy conditions is 48% on December 29.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 59% of the time.

For reference, on February 17, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 48%, while on August 8, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.

Cloud Cover Categories in December

Cloud Cover Categories in December in Templeton1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanAug 892%Aug 892%Dec 159%Dec 159%Dec 3153%Dec 3153%Dec 1157%Dec 1157%Dec 2154%Dec 2154%clearmostly clearpartly cloudymostly cloudyovercast
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. In Templeton, the chance of a wet day over the course of December is increasing, starting the month at 15% and ending it at 20%.

For reference, the year's highest daily chance of a wet day is 24% on February 20, and its lowest chance is 0% on July 29.

Probability of Precipitation in December

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 Templeton is increasing, starting the month at 1.6 inches, when it rarely exceeds 3.6 inches or falls below 0.1 inches, and ending the month at 2.5 inches, when it rarely exceeds 5.9 inches or falls below 0.1 inches.

Average Monthly Rainfall in December

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

Over the course of December in Templeton, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 45 minutes of daylight and the longest day is December 1, with 9 hours, 56 minutes of daylight.

Hours of Daylight and Twilight in December

Hours of Daylight and Twilight in December in Templeton1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 45 minDec 219 hr, 45 minnightnightdaydayDec 19 hr, 56 minDec 19 hr, 56 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 Templeton is 6:54 AM on December 1 and the latest sunrise is 18 minutes later at 7:12 AM on December 31.

The earliest sunset is 4:49 PM on December 5 and the latest sunset is 11 minutes later at 5:00 PM on December 31.

Daylight saving time is observed in Templeton during 2017, but it neither starts nor ends during December, so the entire month is in standard time.

For reference, on June 21, the longest day of the year, the Sun rises at 5:47 AM and sets 14 hours, 34 minutes later, at 8:21 PM, while on December 21, the shortest day of the year, it rises at 7:08 AM and sets 9 hours, 45 minutes later, at 4:53 PM.

Sunrise & Sunset with Twilight and Daylight Saving Time in December

Sunrise & Sunset with Twilight and Daylight Saving Time in December in Templeton18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMNovJan6:54 AM6:54 AMDec 14:49 PMDec 14:49 PM7:12 AM7:12 AMDec 315:00 PMDec 315:00 PM7:02 AM7:02 AMDec 114:50 PMDec 114:50 PM7:08 AM7:08 AMDec 214:53 PMDec 214:53 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.

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.

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

For reference, on September 6, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December

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 in Templeton is essentially constant during December, remaining within 0.1 miles per hour of 7.7 miles per hour throughout.

For reference, on May 29, the windiest day of the year, the daily average wind speed is 8.8 miles per hour, while on September 10, the calmest day of the year, the daily average wind speed is 6.6 miles per hour.

The highest daily average wind speed during December is 7.8 miles per hour on December 14.

Average Wind Speed in December

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 Templeton throughout December is predominantly from the north, with a peak proportion of 42% on December 1.

Wind Direction in December

Wind Direction in December in Templeton1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanwestsoutheastnorth
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).

Water Temperature

Templeton is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Templeton is essentially constant during December, remaining within 1°F of 57°F throughout.

Average Water Temperature in December

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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).

The growing season in Templeton typically lasts for 9.3 months (283 days), from around February 16 to around November 26, rarely starting after April 3, or ending before November 4.

The month of December in Templeton is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season reaching a low of 10% on December 29.

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

Time Spent in Various Temperature Bands and the Growing Season in December in Templeton1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanDec 139%Dec 139%Dec 3110%Dec 3110%Dec 1122%Dec 1122%Dec 2112%Dec 2112%50%Nov 2650%Nov 2690%Nov 490%Nov 4very coldcoldcoolfreezingwarm
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.

The average accumulated growing degree days in Templeton are gradually increasing during December, increasing by 70°F, from 3,211°F to 3,281°F, over the course of the month.

Growing Degree Days in December

The average growing degree days accumulated over the course of December, 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 in Templeton is essentially constant during December, remaining within 0.2 kWh of 2.8 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 2.6 kWh on December 24.

Average Daily Incident Shortwave Solar Energy in December

Average Daily Incident Shortwave Solar Energy in December in Templeton1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWh4.0 kWh4.5 kWhNovJanDec 242.6 kWhDec 242.6 kWhDec 12.9 kWhDec 12.9 kWhDec 112.7 kWhDec 112.7 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 Templeton are 35.550 deg latitude, -120.706 deg longitude, and 873 ft elevation.

The topography within 2 miles of Templeton contains only modest variations in elevation, with a maximum elevation change of 295 feet and an average elevation above sea level of 833 feet. Within 10 miles contains only modest variations in elevation (2,310 feet). Within 50 miles contains large variations in elevation (4,472 feet).

The area within 2 miles of Templeton is covered by grassland (76%), within 10 miles by grassland (66%) and shrubs (15%), and within 50 miles by grassland (44%) and water (27%).

Data Sources

This report illustrates the typical weather in Templeton year round, 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 Templeton.

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

The stations contributing to this reconstruction are: Paso Robles Municipal Airport (74%, 15 kilometers, northeast); San Luis Obispo County Airport (17%, 35 kilometers, south); and Point Piedras Blanca (10%, 54 kilometers, west).

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.