Average Weather in January in Walnut Grove Washington, United States
Daily high temperatures increase by 4°F, from 44°F to 48°F, rarely falling below 36°F or exceeding 55°F. The lowest daily average high temperature is 44°F on January 1.
Daily low temperatures are around 36°F, rarely falling below 26°F or exceeding 44°F.
For reference, on August 3, the hottest day of the year, temperatures in Walnut Grove typically range from 59°F to 83°F, while on December 31, the coldest day of the year, they range from 35°F to 44°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 Walnut Grove experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 76% throughout the month. The highest chance of overcast or mostly cloudy conditions is 77% on January 14.
The clearest day of the month is January 30, with clear, mostly clear, or partly cloudy conditions 26% of the time.
For reference, on November 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 78%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.
Cloud Cover Categories in January
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 Walnut Grove, the chance of a wet day over the course of January is decreasing, starting the month at 53% and ending it at 48%.
For reference, the year's highest daily chance of a wet day is 60% on November 18, and its lowest chance is 5% on August 5.
Over the course of January in Walnut Grove, the chance of a day with only rain decreases from 48% to 45%, 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 remains an essentially constant 1% throughout.
Probability of Precipitation in January
The average sliding 31-day rainfall during January in Walnut Grove is decreasing, starting the month at 8.2 inches, when it rarely exceeds 13.0 inches or falls below 3.4 inches, and ending the month at 7.2 inches, when it rarely exceeds 12.1 inches or falls below 2.5 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 Walnut Grove is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 1.6 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Walnut Grove, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 56 minutes, implying an average daily increase of 1 minute, 53 seconds, and weekly increase of 13 minutes, 10 seconds.
The shortest day of the month is January 1, with 8 hours, 46 minutes of daylight and the longest day is January 31, with 9 hours, 43 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Walnut Grove is 7:51 AM on January 1 and the earliest sunrise is 18 minutes earlier at 7:32 AM on January 31.
The earliest sunset is 4:37 PM on January 1 and the latest sunset is 38 minutes later at 5:15 PM on January 31.
Daylight saving time is observed in Walnut Grove 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 5:20 AM and sets 15 hours, 43 minutes later, at 9:03 PM, while on December 21, the shortest day of the year, it rises at 7:48 AM and sets 8 hours, 41 minutes later, at 4:29 PM.
Sunrise & Sunset with Twilight in January
The chance that a given day will be muggy in Walnut Grove is essentially constant during January, remaining around 0% throughout.
For reference, on August 5, the muggiest day of the year, there are muggy conditions 0% of the time, while on November 7, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in January
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Walnut Grove is essentially constant during January, remaining within 0.1 miles per hour of 5.8 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 6.0 miles per hour, while on August 23, the calmest day of the year, the daily average wind speed is 4.0 miles per hour.
Average Wind Speed in January
Wind Direction in January
Walnut Grove 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 Walnut Grove is essentially constant during January, remaining around 49°F throughout.
Average Water Temperature in January
The growing season in Walnut Grove typically lasts for 8.1 months (249 days), from around March 14 to around November 18, rarely starting before February 15 or after April 10, and rarely ending before October 25 or after December 17.
The month of January in Walnut Grove 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 Walnut Grove are essentially constant during January, remaining within 3°F of 3°F throughout.
Growing Degree Days in January
The average daily incident shortwave solar energy in Walnut Grove is gradually increasing during January, rising by 0.6 kWh, from 1.0 kWh to 1.6 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 Walnut Grove are 45.668 deg latitude, -122.599 deg longitude, and 233 ft elevation.
The topography within 2 miles of Walnut Grove contains only modest variations in elevation, with a maximum elevation change of 161 feet and an average elevation above sea level of 247 feet. Within 10 miles contains only modest variations in elevation (1,447 feet). Within 50 miles contains very significant variations in elevation (11,165 feet).
The area within 2 miles of Walnut Grove is covered by artificial surfaces (98%), within 10 miles by artificial surfaces (47%) and cropland (29%), and within 50 miles by trees (50%) and shrubs (21%).
This report illustrates the typical weather in Walnut Grove 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 Walnut Grove.
For each station, the records are corrected for the elevation difference between that station and Walnut Grove 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 Walnut Grove is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Walnut Grove and a given station.
The stations contributing to this reconstruction are: Pearson Airpark (48%, 7 kilometers, southwest); Portland International Airport (40%, 8 kilometers, south); and Scappoose Industrial Airpark (11%, 23 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .