Average Weather in December in Connell Washington, United States
Daily high temperatures decrease by 5°F, from 42°F to 36°F, rarely falling below 24°F or exceeding 54°F. The lowest daily average high temperature is 36°F on December 29.
Daily low temperatures decrease by 4°F, from 31°F to 27°F, rarely falling below 14°F or exceeding 41°F. The lowest daily average low temperature is 27°F on December 23.
For reference, on July 31, the hottest day of the year, temperatures in Connell typically range from 62°F to 93°F, while on December 23, the coldest day of the year, they range from 27°F to 36°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 Connell experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 65% throughout the month.
The clearest day of the month is December 17, with clear, mostly clear, or partly cloudy conditions 37% of the time.
For reference, on January 15, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on August 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.
Cloud Cover Categories in December
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Connell, the chance of a wet day over the course of December is decreasing, starting the month at 25% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 26% on November 28, and its lowest chance is 3% on August 18.
Over the course of December in Connell, the chance of a day with only rain decreases from 20% to 10%, the chance of a day with mixed snow and rain remains an essentially constant 3% throughout, and the chance of a day with only snow increases from 3% to 6%.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Connell is essentially constant, remaining about 0.8 inches throughout, and rarely exceeding 1.7 inches or falling below 0.1 inches.
Average Monthly Rainfall in December
We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. As with rainfall, we consider the liquid-equivalent snowfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day liquid-equivalent snowfall during December in Connell is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches.
The highest average 31-day liquid-equivalent accumulation is 0.3 inches on December 31.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Connell, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 33 minutes of daylight and the longest day is December 1, with 8 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Connell is 7:19 AM on December 1 and the latest sunrise is 21 minutes later at 7:39 AM on December 31.
The earliest sunset is 4:07 PM on December 10 and the latest sunset is 10 minutes later at 4:17 PM on December 31.
Daylight saving time is observed in Connell 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 5:01 AM and sets 15 hours, 51 minutes later, at 8:52 PM, while on December 21, the shortest day of the year, it rises at 7:37 AM and sets 8 hours, 33 minutes later, at 4:10 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Connell is essentially constant during December, remaining around 0% throughout.
For reference, on July 16, 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 Connell is gradually decreasing during December, decreasing from 8.2 miles per hour to 7.3 miles per hour over the course of the month.
For reference, on March 27, the windiest day of the year, the daily average wind speed is 8.6 miles per hour, while on August 31, the calmest day of the year, the daily average wind speed is 6.8 miles per hour.
Average Wind Speed in December
Wind Direction in December
The growing season in Connell typically lasts for 6.4 months (195 days), from around April 10 to around October 22, rarely starting before March 19 or after April 28, and rarely ending before October 4 or after November 9.
The month of December in Connell is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in December
The average accumulated growing degree days in Connell are essentially constant during December, remaining within 2°F of 3,195°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Connell is essentially constant during December, remaining within 0.1 kWh of 1.2 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.2 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Connell are 46.663 deg latitude, -118.861 deg longitude, and 1,014 ft elevation.
The topography within 2 miles of Connell contains only modest variations in elevation, with a maximum elevation change of 371 feet and an average elevation above sea level of 956 feet. Within 10 miles contains only modest variations in elevation (823 feet). Within 50 miles contains very significant variations in elevation (3,340 feet).
The area within 2 miles of Connell is covered by shrubs (61%) and cropland (30%), within 10 miles by cropland (44%) and shrubs (42%), and within 50 miles by shrubs (45%) and cropland (40%).
This report illustrates the typical weather in Connell 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Connell.
For each station, the records are corrected for the elevation difference between that station and Connell 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 Connell is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Connell and a given station.
The stations contributing to this reconstruction are: Tri-Cities Airport (29%, 48 kilometers, southwest); Hanford (24%, 58 kilometers, west); Grant County International Airport (18%, 70 kilometers, northwest); Walla Walla Regional Airport (16%, 77 kilometers, southeast); Pullman–Moscow Regional Airport (6%, 134 kilometers, east); and Fairchild Air Force Base (6%, 142 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .