Average Weather in January in Yacolt Washington, United States
Daily high temperatures increase by 4°F, from 40°F to 44°F, rarely falling below 32°F or exceeding 51°F. The lowest daily average high temperature is 40°F on January 1.
Daily low temperatures are around 33°F, rarely falling below 22°F or exceeding 41°F.
For reference, on August 4, the hottest day of the year, temperatures in Yacolt typically range from 56°F to 82°F, while on December 30, the coldest day of the year, they range from 32°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
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The month of January in Yacolt experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 78% throughout the month.
The clearest day of the month is January 29, with clear, mostly clear, or partly cloudy conditions 24% of the time.
For reference, on December 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 81%, while on August 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.
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 Yacolt, the chance of a wet day over the course of January is decreasing, starting the month at 54% and ending it at 49%.
For reference, the year's highest daily chance of a wet day is 61% on November 18, and its lowest chance is 5% on August 5.
Over the course of January in Yacolt, the chance of a day with only rain remains an essentially constant 41% throughout, the chance of a day with mixed snow and rain decreases from 8% to 6%, and the chance of a day with only snow remains an essentially constant 4% throughout.
Probability of Precipitation in January
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during January in Yacolt is decreasing, starting the month at 8.3 inches, when it rarely exceeds 12.9 inches or falls below 3.3 inches, and ending the month at 7.5 inches, when it rarely exceeds 12.9 inches or falls below 2.7 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 Yacolt is gradually decreasing, starting the month at 1.0 inches, when it rarely exceeds 2.9 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.8 inches.
The highest average 31-day liquid-equivalent accumulation is 1.0 inches on January 6.
Average Monthly Liquid-Equivalent Snowfall in January
Over the course of January in Yacolt, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 57 minutes, implying an average daily increase of 1 minute, 55 seconds, and weekly increase of 13 minutes, 24 seconds.
The shortest day of the month is January 1, with 8 hours, 45 minutes of daylight and the longest day is January 31, with 9 hours, 42 minutes of daylight.
Hours of Daylight and Twilight in January
The latest sunrise of the month in Yacolt is 7:51 AM on January 1 and the earliest sunrise is 19 minutes earlier at 7:32 AM on January 31.
The earliest sunset is 4:35 PM on January 1 and the latest sunset is 39 minutes later at 5:14 PM on January 31.
Daylight saving time is observed in Yacolt during 2021, 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 5:19 AM and sets 15 hours, 44 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, 39 minutes later, at 4:27 PM.
Sunrise & Sunset with Twilight in January
The figure below presents a compact representation of key lunar data for January 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in January
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Yacolt is essentially constant during January, remaining around 0% throughout.
For reference, on August 4, 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
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Yacolt is essentially constant during January, remaining within 0.1 miles per hour of 5.4 miles per hour throughout.
For reference, on December 29, the windiest day of the year, the daily average wind speed is 5.6 miles per hour, while on August 23, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.
Average Wind Speed in January
The hourly average wind direction in Yacolt throughout January is predominantly from the east, with a peak proportion of 50% on January 6.
Wind Direction in January
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
The growing season in Yacolt typically lasts for 6.8 months (208 days), from around April 11 to around November 5, rarely starting before March 17 or after May 7, and rarely ending before October 17 or after November 28.
The month of January in Yacolt is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in January
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Yacolt are essentially constant during January, remaining within 1°F of 1°F throughout.
Growing Degree Days in January
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Yacolt is gradually increasing during January, rising by 0.5 kWh, from 0.9 kWh to 1.5 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 Yacolt are 45.866 deg latitude, -122.406 deg longitude, and 709 ft elevation.
The topography within 2 miles of Yacolt contains very significant variations in elevation, with a maximum elevation change of 1,030 feet and an average elevation above sea level of 861 feet. Within 10 miles contains very significant variations in elevation (3,796 feet). Within 50 miles also contains extreme variations in elevation (12,274 feet).
The area within 2 miles of Yacolt is covered by shrubs (55%) and trees (40%), within 10 miles by trees (47%) and shrubs (36%), and within 50 miles by trees (53%) and shrubs (24%).
This report illustrates the typical weather in Yacolt, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Yacolt.
For each station, the records are corrected for the elevation difference between that station and Yacolt 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 Yacolt is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Yacolt and a given station.
The stations contributing to this reconstruction are: Pearson Airpark (26%, 34 kilometers, southwest); Portland–Troutdale Airport (25%, 35 kilometers, south); Scappoose Industrial Airpark (24%, 37 kilometers, west); Southwest Washington Regional Airport (18%, 47 kilometers, northwest); and The Dalles Municipal Airport (6%, 100 kilometers, east).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for airports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.