Average Weather in December in Pioneer California, United States
Daily high temperatures decrease by 2°F, from 54°F to 52°F, rarely falling below 42°F or exceeding 64°F. The lowest daily average high temperature is 52°F on December 23.
Daily low temperatures decrease by 2°F, from 40°F to 38°F, rarely falling below 30°F or exceeding 48°F. The lowest daily average low temperature is 38°F on December 23.
For reference, on July 28, the hottest day of the year, temperatures in Pioneer typically range from 64°F to 88°F, while on December 23, the coldest day of the year, they range from 38°F to 52°F.
Average High and Low Temperature in December
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
Bodonal de la Sierra, Spain (5,696 miles away); Castejón, Spain (5,681 miles); and Monti, Italy (6,123 miles) are the far-away foreign places with temperatures most similar to Pioneer (view comparison).
The month of December in Pioneer experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 55% throughout the month.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 47% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Pioneer, the chance of a wet day over the course of December is essentially constant, remaining around 29% throughout.
For reference, the year's highest daily chance of a wet day is 34% on February 21, and its lowest chance is 1% on August 1.
Over the course of December in Pioneer, the chance of a day with only rain remains an essentially constant 28% throughout, the chance of a day with mixed snow and rain remains an essentially constant 1% throughout, and the chance of a day with only snow remains an essentially constant 0% throughout.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Pioneer is increasing, starting the month at 4.2 inches, when it rarely exceeds 8.5 inches or falls below 0.8 inches, and ending the month at 4.9 inches, when it rarely exceeds 10.4 inches or falls below 0.4 inches.
Average Monthly Rainfall in December
Over the course of December in Pioneer, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 29 minutes of daylight and the longest day is December 1, with 9 hours, 41 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Pioneer is 7:00 AM on December 1 and the latest sunrise is 19 minutes later at 7:19 AM on December 31.
The earliest sunset is 4:41 PM on December 7 and the latest sunset is 10 minutes later at 4:51 PM on December 31.
Daylight saving time is observed in Pioneer during 2018, 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 5:38 AM and sets 14 hours, 51 minutes later, at 8:29 PM, while on December 21, the shortest day of the year, it rises at 7:15 AM and sets 9 hours, 29 minutes later, at 4:45 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Pioneer is essentially constant during December, remaining around 0% throughout.
For reference, on August 21, 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 average hourly wind speed in Pioneer is essentially constant during December, remaining within 0.1 miles per hour of 6.3 miles per hour throughout.
For reference, on December 24, the windiest day of the year, the daily average wind speed is 6.4 miles per hour, while on September 24, the calmest day of the year, the daily average wind speed is 5.4 miles per hour.
The highest daily average wind speed during December is 6.4 miles per hour on December 24.
Average Wind Speed in December
Wind Direction in December
The growing season in Pioneer typically lasts for 8.1 months (247 days), from around March 26 to around November 28, rarely starting before February 11 or after April 19, and rarely ending before November 4 or after December 29.
The month of December in Pioneer is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season rapidly decreasing from 45% to 9% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Pioneer are essentially constant during December, remaining within 14°F of 3,802°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Pioneer is essentially constant during December, remaining within 0.1 kWh of 2.3 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.2 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Pioneer are 38.432 deg latitude, -120.572 deg longitude, and 2,730 ft elevation.
The topography within 2 miles of Pioneer contains very significant variations in elevation, with a maximum elevation change of 1,762 feet and an average elevation above sea level of 2,869 feet. Within 10 miles contains very significant variations in elevation (4,341 feet). Within 50 miles also contains extreme variations in elevation (11,142 feet).
The area within 2 miles of Pioneer is covered by trees (56%) and shrubs (44%), within 10 miles by trees (60%) and shrubs (36%), and within 50 miles by trees (35%) and shrubs (25%).
This report illustrates the typical weather in Pioneer 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Pioneer.
For each station, the records are corrected for the elevation difference between that station and Pioneer 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 Pioneer is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Pioneer and a given station.
The stations contributing to this reconstruction are: Placerville Airport (70%, 35 kilometers, northwest); Lake Tahoe Airport (10%, 72 kilometers, northeast); Stockton Metropolitan Airport (12%, 83 kilometers, southwest); and Bridgeport Sonora Junction (8%, 92 kilometers, east).
Time zones for aiports and weather stations are provided by AskGeo.com .