Average Weather in December in Enterprise Oregon, United States
Daily high temperatures decrease by 5°F, from 35°F to 30°F, rarely falling below 19°F or exceeding 44°F. The lowest daily average high temperature is 30°F on December 29.
Daily low temperatures decrease by 4°F, from 24°F to 20°F, rarely falling below 7°F or exceeding 35°F. The lowest daily average low temperature is 20°F on December 29.
For reference, on August 2, the hottest day of the year, temperatures in Enterprise typically range from 51°F to 84°F, while on December 29, the coldest day of the year, they range from 20°F to 30°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
Saint Maurice, Italy (5,297 miles away); Štrpce, Kosovo (5,865 miles); and Yapraklı, Turkey (6,226 miles) are the far-away foreign places with temperatures most similar to Enterprise (view comparison).
The month of December in Enterprise experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 66% throughout the month.
The clearest day of the month is December 22, with clear, mostly clear, or partly cloudy conditions 36% of the time.
For reference, on January 10, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 67%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.
Cloud Cover Categories in December
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Enterprise, the chance of a wet day over the course of December is decreasing, starting the month at 35% and ending it at 30%.
For reference, the year's highest daily chance of a wet day is 35% on December 1, and its lowest chance is 8% on August 3.
Over the course of December in Enterprise, the chance of a day with only rain decreases from 16% to 9%, the chance of a day with mixed snow and rain remains an essentially constant 8% throughout, and the chance of a day with only snow increases from 10% to 14%.
Probability of Precipitation in December
The average sliding 31-day rainfall during December in Enterprise is gradually decreasing, starting the month at 1.4 inches, when it rarely exceeds 3.0 inches or falls below 0.3 inches, and ending the month at 1.0 inches, when it rarely exceeds 2.3 inches or falls 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 Enterprise is gradually increasing, starting the month at 0.6 inches, when it rarely exceeds 1.3 inches or falls below 0.1 inches, and ending the month at 1.0 inches, when it rarely exceeds 1.9 inches or falls below 0.2 inches.
The highest average 31-day liquid-equivalent accumulation is 1.0 inches on December 31.
Average Monthly Liquid-Equivalent Snowfall in December
Over the course of December in Enterprise, the length of the day is essentially constant. The shortest day of the month is December 21, with 8 hours, 43 minutes of daylight and the longest day is December 1, with 8 hours, 59 minutes of daylight.
Hours of Daylight and Twilight in December
The earliest sunrise of the month in Enterprise is 7:08 AM on December 1 and the latest sunrise is 20 minutes later at 7:28 AM on December 31.
The earliest sunset is 4:05 PM on December 10 and the latest sunset is 10 minutes later at 4:15 PM on December 31.
Daylight saving time is observed in Enterprise 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 5:00 AM and sets 15 hours, 41 minutes later, at 8:41 PM, while on December 21, the shortest day of the year, it rises at 7:25 AM and sets 8 hours, 43 minutes later, at 4:08 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in December
The chance that a given day will be muggy in Enterprise is essentially constant during December, remaining around 0% throughout.
Humidity Comfort Levels in December
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Enterprise is essentially constant during December, remaining within 0.1 miles per hour of 7.0 miles per hour throughout.
For reference, on December 30, the windiest day of the year, the daily average wind speed is 7.1 miles per hour, while on August 9, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.
The highest daily average wind speed during December is 7.1 miles per hour on December 30.
Average Wind Speed in December
Wind Direction in December
The growing season in Enterprise typically lasts for 4.1 months (126 days), from around May 17 to around September 21, rarely starting before April 28 or after June 6, and rarely ending before September 3 or after October 9.
The month of December in Enterprise 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 Enterprise are essentially constant during December, remaining around 1,706°F throughout.
Growing Degree Days in December
The average daily incident shortwave solar energy in Enterprise is essentially constant during December, remaining within 0.1 kWh of 1.4 kWh throughout.
The lowest average daily incident shortwave solar energy during December is 1.4 kWh on December 23.
Average Daily Incident Shortwave Solar Energy in December
For the purposes of this report, the geographical coordinates of Enterprise are 45.426 deg latitude, -117.279 deg longitude, and 3,930 ft elevation.
The topography within 2 miles of Enterprise contains significant variations in elevation, with a maximum elevation change of 581 feet and an average elevation above sea level of 3,859 feet. Within 10 miles contains significant variations in elevation (6,427 feet). Within 50 miles also contains extreme variations in elevation (8,973 feet).
The area within 2 miles of Enterprise is covered by cropland (37%), grassland (34%), and shrubs (25%), within 10 miles by shrubs (33%) and grassland (25%), and within 50 miles by shrubs (50%) and trees (30%).
This report illustrates the typical weather in Enterprise 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 Enterprise.
For each station, the records are corrected for the elevation difference between that station and Enterprise 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 Enterprise is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Enterprise and a given station.
The stations contributing to this reconstruction are: La Grande Municipal Airport (28%, 59 kilometers, west); Baker Municipal Airport (23%, 77 kilometers, southwest); Idaho County Airport (14%, 107 kilometers, northeast); Lewiston–Nez Perce County Airport (11%, 108 kilometers, north); Walla Walla Regional Airport (10%, 108 kilometers, northwest); and McCall Airport (13%, 110 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .