Average Weather in January in John Day Oregon, United States
Daily high temperatures increase by 3°F, from 40°F to 43°F, rarely falling below 29°F or exceeding 53°F.
Daily low temperatures are around 28°F, rarely falling below 12°F or exceeding 39°F.
For reference, on August 3, the hottest day of the year, temperatures in John Day typically range from 57°F to 89°F, while on December 20, the coldest day of the year, they range from 27°F to 40°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 John Day 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 28, with clear, mostly clear, or partly cloudy conditions 37% 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 83%.
Cloud Cover Categories in January
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In John Day, the chance of a wet day over the course of January is decreasing, starting the month at 26% and ending it at 21%.
For reference, the year's highest daily chance of a wet day is 28% on December 16, and its lowest chance is 6% on August 16.
Over the course of January in John Day, the chance of a day with only rain remains an essentially constant 17% throughout, the chance of a day with mixed snow and rain decreases from 6% to 3%, and the chance of a day with only snow remains an essentially constant 3% throughout.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in John Day is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.1 inches or falling below 0.2 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 John Day is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches or falling below -0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in John Day, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 54 minutes, implying an average daily increase of 1 minute, 47 seconds, and weekly increase of 12 minutes, 31 seconds.
The shortest day of the month is January 1, with 8 hours, 55 minutes of daylight and the longest day is January 31, with 9 hours, 49 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in John Day is 7:32 AM on January 2 and the earliest sunrise is 17 minutes earlier at 7:15 AM on January 31.
The earliest sunset is 4:27 PM on January 1 and the latest sunset is 37 minutes later at 5:03 PM on January 31.
Daylight saving time is observed in John Day 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 5:11 AM and sets 15 hours, 32 minutes later, at 8:43 PM, while on December 21, the shortest day of the year, it rises at 7:28 AM and sets 8 hours, 50 minutes later, at 4:19 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in John Day is essentially constant during January, remaining around 0% throughout.
For reference, on July 10, 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 John Day is essentially constant during January, remaining within 0.1 miles per hour of 6.2 miles per hour throughout.
For reference, on December 3, the windiest day of the year, the daily average wind speed is 6.3 miles per hour, while on August 11, the calmest day of the year, the daily average wind speed is 4.8 miles per hour.
Average Wind Speed in January
Wind Direction in January
The growing season in John Day typically lasts for 5.5 months (168 days), from around April 30 to around October 15, rarely starting before April 8 or after May 21, and rarely ending before September 29 or after November 2.
The month of January in John Day 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 John Day are essentially constant during January, remaining within 1°F of 1°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in John Day is gradually increasing during January, rising by 0.7 kWh, from 1.5 kWh to 2.2 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 John Day are 44.416 deg latitude, -118.953 deg longitude, and 3,583 ft elevation.
The topography within 2 miles of John Day contains very significant variations in elevation, with a maximum elevation change of 1,093 feet and an average elevation above sea level of 3,406 feet. Within 10 miles contains very significant variations in elevation (5,171 feet). Within 50 miles also contains extreme variations in elevation (7,244 feet).
The area within 2 miles of John Day is covered by shrubs (92%), within 10 miles by shrubs (69%) and trees (26%), and within 50 miles by shrubs (61%) and trees (35%).
This report illustrates the typical weather in John Day 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 John Day.
For each station, the records are corrected for the elevation difference between that station and John Day 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 John Day is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between John Day and a given station.
The stations contributing to this reconstruction are: John Day State Airport (99%, 2.1 kilometers, southwest); Baker Municipal Airport (0.8%, 102 kilometers, northeast); and Meacham, Meacham (0.6%, 129 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .