Average Weather in December in Buttonwillow California, United States
Daily high temperatures decrease by 4°F, from 64°F to 60°F, rarely falling below 52°F or exceeding 72°F. The lowest daily average high temperature is 60°F on December 27.
Daily low temperatures decrease by 3°F, from 41°F to 39°F, rarely falling below 31°F or exceeding 50°F. The lowest daily average low temperature is 39°F on December 30.
For reference, on July 22, the hottest day of the year, temperatures in Buttonwillow typically range from 68°F to 98°F, while on December 30, the coldest day of the year, they range from 39°F to 60°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
The month of December in Buttonwillow experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 37% to 43%. The highest chance of overcast or mostly cloudy conditions is 43% on December 28.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 63% of the time.
For reference, on February 21, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 43%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 92%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Buttonwillow, the chance of a wet day over the course of December is increasing, starting the month at 13% and ending it at 17%.
For reference, the year's highest daily chance of a wet day is 23% on February 21, and its lowest chance is 0% on July 2.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Buttonwillow is increasing, starting the month at 1.3 inches, when it rarely exceeds 2.8 inches or falls below 0.1 inches, and ending the month at 1.9 inches, when it rarely exceeds 4.7 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Buttonwillow, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 46 minutes of daylight and the longest day is December 1, with 9 hours, 57 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Buttonwillow is 6:48 AM on December 1 and the latest sunrise is 18 minutes later at 7:06 AM on December 31.
The earliest sunset is 4:44 PM on December 5 and the latest sunset is 10 minutes later at 4:55 PM on December 31.
Daylight saving time is observed in Buttonwillow 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 5:43 AM and sets 14 hours, 33 minutes later, at 8:16 PM, while on December 21, the shortest day of the year, it rises at 7:03 AM and sets 9 hours, 46 minutes later, at 4:49 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Buttonwillow is essentially constant during December, remaining around 0% throughout.
For reference, on July 18, 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 Buttonwillow is essentially constant during December, remaining within 0.1 miles per hour of 5.1 miles per hour throughout.
For reference, on May 30, the windiest day of the year, the daily average wind speed is 7.0 miles per hour, while on November 7, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
The highest daily average wind speed during December is 5.2 miles per hour on December 23.
Average Wind Speed in December
Wind Direction in December
Buttonwillow 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 Buttonwillow is essentially constant during December, remaining within 1°F of 57°F throughout.
Average Water Temperature in December
The growing season in Buttonwillow typically lasts for 11 months (321 days), from around January 20 to around December 7, rarely starting after February 23, or ending before November 18.
The smallest chance that a given day will be within the growing season in Buttonwillow during December is 21% on December 28.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Buttonwillow are gradually increasing during December, increasing by 94°F, from 5,310°F to 5,404°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Buttonwillow is essentially constant during December, remaining within 0.1 kWh of 2.9 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.7 kWh on December 26.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Buttonwillow are 35.401 deg latitude, -119.470 deg longitude, and 272 ft elevation.
The topography within 2 miles of Buttonwillow is essentially flat, with a maximum elevation change of 46 feet and an average elevation above sea level of 273 feet. Within 10 miles is essentially flat (1,296 feet). Within 50 miles contains very significant variations in elevation (8,638 feet).
The area within 2 miles of Buttonwillow is covered by cropland (96%), within 10 miles by cropland (61%) and grassland (28%), and within 50 miles by grassland (41%) and cropland (32%).
This report illustrates the typical weather in Buttonwillow 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Buttonwillow.
For each station, the records are corrected for the elevation difference between that station and Buttonwillow 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 Buttonwillow is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Buttonwillow and a given station.
The stations contributing to this reconstruction are: Meadows Field (54%, 38 kilometers, east); Santa Ynez Airport (12%, 104 kilometers, southwest); Santa Maria Airport (12%, 105 kilometers, southwest); San Luis Obispo County Airport (11%, 108 kilometers, west); and Paso Robles Municipal Airport (11%, 109 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .