Average Weather in December in Santa Maria California, United States
Daily high temperatures decrease by 2°F, from 66°F to 64°F, rarely falling below 56°F or exceeding 75°F. The lowest daily average high temperature is 63°F on December 25.
Daily low temperatures are around 42°F, rarely falling below 32°F or exceeding 52°F. The lowest daily average low temperature is 41°F on December 27.
For reference, on September 21, the hottest day of the year, temperatures in Santa Maria typically range from 54°F to 75°F, while on December 23, the coldest day of the year, they range from 41°F to 63°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 Santa Maria experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 39% to 45%. The highest chance of overcast or mostly cloudy conditions is 46% on December 29.
The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 61% of the time.
For reference, on February 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 46%, while on August 24, 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 Santa Maria, the chance of a wet day over the course of December is increasing, starting the month at 14% and ending it at 18%.
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 31.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Santa Maria is increasing, starting the month at 1.6 inches, when it rarely exceeds 3.4 inches or falls below 0.1 inches, and ending the month at 2.6 inches, when it rarely exceeds 5.9 inches or falls below 0.1 inches.
Average Monthly Rainfall in December
Over the course of December in Santa Maria, the length of the day is essentially constant. The shortest day of the month is December 21, with 9 hours, 48 minutes of daylight and the longest day is December 1, with 9 hours, 59 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Santa Maria is 6:51 AM on December 1 and the latest sunrise is 18 minutes later at 7:09 AM on December 31.
The earliest sunset is 4:49 PM on December 5 and the latest sunset is 10 minutes later at 5:00 PM on December 31.
Daylight saving time is observed in Santa Maria 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 5:48 AM and sets 14 hours, 31 minutes later, at 8:18 PM, while on December 21, the shortest day of the year, it rises at 7:05 AM and sets 9 hours, 48 minutes later, at 4:54 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Santa Maria is essentially constant during December, remaining around 0% throughout.
For reference, on July 8, 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 Santa Maria is essentially constant during December, remaining within 0.1 miles per hour of 8.7 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 9.7 miles per hour, while on August 10, the calmest day of the year, the daily average wind speed is 7.2 miles per hour.
The highest daily average wind speed during December is 8.7 miles per hour on December 14.
Average Wind Speed in December
Wind Direction in December
Santa Maria 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 Santa Maria is essentially constant during December, remaining within 1°F of 57°F throughout.
Average Water Temperature in December
The growing season in Santa Maria typically lasts for 11 months (320 days), from around January 27 to around December 13, rarely starting after March 10, or ending before November 18.
During December in Santa Maria, the chance that a given day is within the growing season is rapidly decreasing falling from 73% to 29% 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 Santa Maria are gradually increasing during December, increasing by 130°F, from 2,966°F to 3,096°F, over the course of the month.
Growing Degree Days in December
The average daily incident shortwave solar energy in Santa Maria is essentially constant during December, remaining within 0.2 kWh of 2.9 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 2.7 kWh on December 24.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Santa Maria are 34.953 deg latitude, -120.436 deg longitude, and 220 ft elevation.
The topography within 2 miles of Santa Maria is essentially flat, with a maximum elevation change of 75 feet and an average elevation above sea level of 216 feet. Within 10 miles is essentially flat (2,631 feet). Within 50 miles contains large variations in elevation (6,814 feet).
The area within 2 miles of Santa Maria is covered by artificial surfaces (78%) and cropland (20%), within 10 miles by cropland (39%) and grassland (38%), and within 50 miles by water (38%) and grassland (31%).
This report illustrates the typical weather in Santa Maria 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 Santa Maria.
For each station, the records are corrected for the elevation difference between that station and Santa Maria 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 Santa Maria is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Santa Maria and a given station.
The stations contributing to this reconstruction are: Santa Maria Airport (93%, 6 kilometers, south); San Luis Obispo County Airport (6%, 37 kilometers, northwest); and Meadows Field (0.9%, 137 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .