Average Weather in February in Grangeville Idaho, United States
Daily low temperatures increase by 4°F, from 26°F to 29°F, rarely falling below 14°F or exceeding 38°F.
For reference, on August 4, the hottest day of the year, temperatures in Grangeville typically range from 54°F to 84°F, while on December 23, the coldest day of the year, they range from 24°F to 35°F.
Average High and Low Temperature in February
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on February. 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 February
The month of February in Grangeville 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 clearest day of the month is February 15, 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 68%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.
Cloud Cover Categories in February
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Grangeville, the chance of a wet day over the course of February is rapidly increasing, starting the month at 27% and ending it at 33%.
For reference, the year's highest daily chance of a wet day is 37% on November 19, and its lowest chance is 9% on August 5.
Over the course of February in Grangeville, the chance of a day with only rain increases from 16% to 24%, the chance of a day with mixed snow and rain remains an essentially constant 7% throughout, and the chance of a day with only snow remains an essentially constant 3% throughout.
Probability of Precipitation in February
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 February in Grangeville is essentially constant, remaining about 1.5 inches throughout, and rarely exceeding 2.9 inches or falling below 0.3 inches.
The lowest average 31-day accumulation is 1.4 inches on February 4.
Average Monthly Rainfall in February
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 February in Grangeville is essentially constant, remaining about 0.3 inches throughout, and rarely exceeding 0.9 inches or falling to 0.0 inches.
Average Monthly Liquid-Equivalent Snowfall in February
Over the course of February in Grangeville, the length of the day is rapidly increasing. From the start to the end of the month, the length of the day increases by 1 hour, 21 minutes, implying an average daily increase of 3 minutes, 0 seconds, and weekly increase of 21 minutes, 2 seconds.
The shortest day of the month is February 1, with 9 hours, 44 minutes of daylight and the longest day is February 28, with 11 hours, 5 minutes of daylight.
Hours of Daylight and Twilight in February
The latest sunrise of the month in Grangeville is 7:06 AM on February 1 and the earliest sunrise is 42 minutes earlier at 6:24 AM on February 28.
The earliest sunset is 4:50 PM on February 1 and the latest sunset is 40 minutes later at 5:29 PM on February 28.
Daylight saving time is observed in Grangeville during 2018, but it neither starts nor ends during February, so the entire month is in standard time.
For reference, on June 21, the longest day of the year, the Sun rises at 4:54 AM and sets 15 hours, 45 minutes later, at 8:38 PM, while on December 21, the shortest day of the year, it rises at 7:23 AM and sets 8 hours, 39 minutes later, at 4:02 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in February
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 Grangeville is essentially constant during February, remaining around 0% throughout.
For reference, on July 27, 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 February
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 Grangeville is essentially constant during February, remaining within 0.1 miles per hour of 5.6 miles per hour throughout.
For reference, on January 10, the windiest day of the year, the daily average wind speed is 5.8 miles per hour, while on August 4, the calmest day of the year, the daily average wind speed is 4.2 miles per hour.
Average Wind Speed in February
Wind Direction in February
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 Grangeville typically lasts for 4.9 months (151 days), from around May 7 to around October 5, rarely starting before April 17 or after May 25, and rarely ending before September 15 or after October 26.
The month of February in Grangeville is reliably fully outside of the growing season.
Time Spent in Various Temperature Bands and the Growing Season in February
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 Grangeville are essentially constant during February, remaining within 1°F of 2°F throughout.
Growing Degree Days in February
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 Grangeville is gradually increasing during February, rising by 0.9 kWh, from 2.0 kWh to 3.0 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in February
For the purposes of this report, the geographical coordinates of Grangeville are 45.927 deg latitude, -116.122 deg longitude, and 3,366 ft elevation.
The topography within 2 miles of Grangeville contains significant variations in elevation, with a maximum elevation change of 656 feet and an average elevation above sea level of 3,421 feet. Within 10 miles contains significant variations in elevation (4,770 feet). Within 50 miles also contains extreme variations in elevation (8,609 feet).
The area within 2 miles of Grangeville is covered by cropland (66%) and grassland (19%), within 10 miles by cropland (40%) and trees (24%), and within 50 miles by trees (41%) and shrubs (31%).
This report illustrates the typical weather in Grangeville 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 Grangeville.
For each station, the records are corrected for the elevation difference between that station and Grangeville 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 Grangeville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Grangeville and a given station.
The stations contributing to this reconstruction are: Idaho County Airport (100%, 1.8 kilometers, north); McCall Airport (0.3%, 116 kilometers, south); and La Grande Municipal Airport (0.2%, 163 kilometers, southwest).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports 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.