Average Weather in Idaho Falls Idaho, United States
In Idaho Falls, the temperature typically varies from 14°F to 87°F over the course of the year, and is rarely below -3°F or above 94°F.
The hot season lasts for 3.1 months, from June 11 to September 15, with an average daily high temperature above 75°F. The hottest day of the year is July 31, with an average high of 87°F and low of 52°F.
The cold season lasts for 3.2 months, from November 21 to February 28, with an average daily high temperature below 40°F. The coldest day of the year is January 1, with an average low of 14°F and high of 28°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
The length of the day in Idaho Falls varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 57 minutes of daylight; the longest day is June 21, with 15 hours, 25 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:46 AM on June 15, and the latest sunrise is 2 hours, 21 minutes later at 8:07 AM on November 4. The earliest sunset is at 4:51 PM on December 9, and the latest sunset is 4 hours, 21 minutes later at 9:13 PM on June 26.
Daylight saving time (DST) is observed in Idaho Falls during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.
Sunrise & Sunset with Twilight and Daylight Saving Time
In Idaho Falls, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Idaho Falls begins around June 9 and lasts for 4.2 months, ending around October 15. On July 26, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 81% of the time, and overcast or mostly cloudy 19% of the time.
The cloudier part of the year begins around October 15 and lasts for 7.8 months, ending around June 9. On January 17, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Idaho Falls varies throughout the year.
The wetter season lasts 7.3 months, from November 7 to June 15, with a greater than 18% chance of a given day being a wet day. The chance of a wet day peaks at 26% on May 25.
The drier season lasts 4.7 months, from June 15 to November 7. The smallest chance of a wet day is 9% on July 6.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Idaho Falls changes throughout the year.
Rain alone is the most common for 11 months, from January 31 to December 22. The highest chance of a day with rain alone is 26% on May 25.
Snow alone is the most common for 1.3 months, from December 22 to January 31. The highest chance of a day with snow alone is 8% on December 28.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Idaho Falls experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 11 months, from February 14 to January 11, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around May 23, with an average total accumulation of 1.5 inches.
The rainless period of the year lasts for 1.1 months, from January 11 to February 14. The least rain falls around February 1, with and average total accumulation of 0.4 inches.
Average Monthly Rainfall
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. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.
As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day in the year. Idaho Falls experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.4 months, from November 4 to March 16, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 26, with an average total liquid-equivalent accumulation of 0.5 inches.
The snowless period of the year lasts for 7.6 months, from March 16 to November 4. The least snow falls around July 21, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
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 perceived humidity level in Idaho Falls, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, remaining a virtually constant 0% throughout.
Humidity Comfort Levels
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 Idaho Falls experiences mildly seasonal variation over the course of the year.
The windier part of the year lasts for 2.8 months, from February 17 to May 10, with average wind speeds of more than 4.6 miles per hour. The windiest day of the year is March 29, with an average hourly wind speed of 5.2 miles per hour.
The calmer time of year lasts for 9.2 months, from May 10 to February 17. The calmest day of the year is August 4, with an average hourly wind speed of 4.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Idaho Falls is from the south throughout the year.
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 experiences very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 3.0 months, from May 18 to August 19, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is July 1, with an average of 8.2 kWh.
The darker period of the year lasts for 3.5 months, from October 29 to February 14, with an average daily incident shortwave energy per square meter below 3.1 kWh. The darkest day of the year is December 21, with an average of 1.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Idaho Falls are 43.467 deg latitude, -112.034 deg longitude, and 4,701 ft elevation.
The topography within 2 miles of Idaho Falls is essentially flat, with a maximum elevation change of 72 feet, and an average elevation above sea level of 4,698 feet. Within 10 miles contains very significant variations in elevation (1,693 feet). Within 50 miles contains extreme variations in elevation (5,607 feet).
The area within 2 miles of Idaho Falls is covered by artificial surfaces (48%) and cropland (46%), within 10 miles by cropland (65%) and shrubs (15%), and within 50 miles by shrubs (51%) and cropland (28%).
This report illustrates the typical weather in Idaho Falls, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Idaho Falls.
For each station, the records are corrected for the elevation difference between that station and Idaho Falls 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 Idaho Falls is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Idaho Falls and a given station.
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 .