Average Weather in January in Union Oregon, United States
Daily high temperatures increase by 3°F, from 36°F to 39°F, rarely falling below 25°F or exceeding 48°F.
Daily low temperatures are around 25°F, rarely falling below 10°F or exceeding 37°F.
For reference, on August 2, the hottest day of the year, temperatures in Union typically range from 52°F to 88°F, while on December 23, the coldest day of the year, they range from 24°F to 36°F.
Average High and Low Temperature in January
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. 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 January
The month of January in Union 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 highest chance of overcast or mostly cloudy conditions is 67% on January 16.
The clearest day of the month is January 30, with clear, mostly clear, or partly cloudy conditions 36% of the time.
For reference, on January 16, 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 January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Union, the chance of a wet day over the course of January is decreasing, starting the month at 30% and ending it at 26%.
For reference, the year's highest daily chance of a wet day is 34% on November 28, and its lowest chance is 7% on August 2.
Over the course of January in Union, the chance of a day with only rain increases from 15% to 18%, the chance of a day with mixed snow and rain decreases from 7% to 4%, and the chance of a day with only snow decreases from 8% to 3%.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Union is essentially constant, remaining about 1.3 inches throughout, and rarely exceeding 2.6 inches or falling below 0.3 inches.
Average Monthly Rainfall in January
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 January in Union is gradually decreasing, starting the month at 0.6 inches, when it rarely exceeds 1.4 inches, and ending the month at 0.3 inches, when it rarely exceeds 0.9 inches.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Union, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 55 minutes, implying an average daily increase of 1 minute, 51 seconds, and weekly increase of 12 minutes, 56 seconds.
The shortest day of the month is January 1, with 8 hours, 50 minutes of daylight and the longest day is January 31, with 9 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Union is 7:30 AM on January 2 and the earliest sunrise is 18 minutes earlier at 7:12 AM on January 31.
The earliest sunset is 4:20 PM on January 1 and the latest sunset is 38 minutes later at 4:57 PM on January 31.
Daylight saving time is observed in Union during 2018, but it neither starts nor ends during January, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:03 AM and sets 15 hours, 39 minutes later, at 8:42 PM, while on December 21, the shortest day of the year, it rises at 7:27 AM and sets 8 hours, 44 minutes later, at 4:11 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Union is essentially constant during January, remaining around 0% throughout.
For reference, on July 5, 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 January
The average hourly wind speed in Union is essentially constant during January, remaining within 0.2 miles per hour of 6.5 miles per hour throughout.
For reference, on December 30, the windiest day of the year, the daily average wind speed is 6.7 miles per hour, while on August 11, the calmest day of the year, the daily average wind speed is 4.3 miles per hour.
Average Wind Speed in January
Wind Direction in January
The growing season in Union typically lasts for 4.5 months (138 days), from around May 9 to around September 24, rarely starting before April 22 or after May 28, and rarely ending before September 7 or after October 13.
The month of January in Union is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
The average accumulated growing degree days in Union are essentially constant during January, remaining around 0°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in Union is gradually increasing during January, rising by 0.7 kWh, from 1.4 kWh to 2.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in January
For the purposes of this report, the geographical coordinates of Union are 45.208 deg latitude, -117.865 deg longitude, and 2,874 ft elevation.
The topography within 2 miles of Union contains very significant variations in elevation, with a maximum elevation change of 873 feet and an average elevation above sea level of 2,866 feet. Within 10 miles contains very significant variations in elevation (4,436 feet). Within 50 miles also contains extreme variations in elevation (8,520 feet).
The area within 2 miles of Union is covered by cropland (59%), grassland (22%), and shrubs (16%), within 10 miles by shrubs (42%) and cropland (27%), and within 50 miles by shrubs (48%) and trees (34%).
This report illustrates the typical weather in Union 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 Union.
For each station, the records are corrected for the elevation difference between that station and Union 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 Union is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Union and a given station.
The stations contributing to this reconstruction are: La Grande Municipal Airport (82%, 13 kilometers, northwest); Baker Municipal Airport (16%, 41 kilometers, south); and Idaho County Airport (2.2%, 158 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .