Average Weather in Fairfield Idaho, United States
In Fairfield, the summers are warm and mostly clear, the winters are freezing and partly cloudy, and it is dry year round. Over the course of the year, the temperature typically varies from 15°F to 84°F and is rarely below 0°F or above 92°F.
Based on the tourism score, the best time of year to visit Fairfield for warm-weather activities is from early July to mid August.
The warm season lasts for 3.0 months, from June 14 to September 13, with an average daily high temperature above 73°F. The hottest day of the year is July 27, with an average high of 84°F and low of 54°F.
The cold season lasts for 3.2 months, from November 19 to February 27, with an average daily high temperature below 40°F. The coldest day of the year is January 1, with an average low of 15°F and high of 29°F.
Average High and Low Temperature
Average Hourly Temperature
In Fairfield, 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 Fairfield begins around June 12 and lasts for 4.0 months, ending around October 12. On July 28, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 83% of the time, and overcast or mostly cloudy 17% of the time.
The cloudier part of the year begins around October 12 and lasts for 8.0 months, ending around June 12. On February 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 55% of the time, and clear, mostly clear, or partly cloudy 45% of the time.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Fairfield varies throughout the year.
The wetter season lasts 7.5 months, from October 27 to June 11, with a greater than 14% chance of a given day being a wet day. The chance of a wet day peaks at 24% on November 28.
The drier season lasts 4.5 months, from June 11 to October 27. The smallest chance of a wet day is 5% on July 20.
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 Fairfield changes throughout the year.
Rain alone is the most common for 9.6 months, from February 13 to December 3. The highest chance of a day with rain alone is 20% on May 24.
Snow alone is the most common for 2.3 months, from December 3 to February 10. The highest chance of a day with snow alone is 12% on January 1.
Mixed snow and rain is the most common for 3.0 days, from February 10 to February 13. The highest chance of a day with mixed snow and rain is 7% on January 7.
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 of the year. Fairfield experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 9.3 months, from September 11 to June 22, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around May 17, with an average total accumulation of 1.0 inches.
The rainless period of the year lasts for 2.7 months, from June 22 to September 11. The least rain falls around July 21, with an average total accumulation of 0.2 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 of the year. Fairfield experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 5.0 months, from October 29 to March 30, 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 0.9 inches.
The snowless period of the year lasts for 7.0 months, from March 30 to October 29. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Fairfield varies significantly over the course of the year. In 2018, the shortest day is December 21, with 8 hours, 58 minutes of daylight; the longest day is June 21, with 15 hours, 24 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:58 AM on June 15, and the latest sunrise is 2 hours, 19 minutes later at 8:17 AM on November 3. The earliest sunset is at 5:03 PM on December 9, and the latest sunset is 4 hours, 20 minutes later at 9:23 PM on June 27.
Daylight saving time (DST) is observed in Fairfield during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Fairfield, 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
The average hourly wind speed in Fairfield experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 5.0 months, from March 5 to August 4, with average wind speeds of more than 7.2 miles per hour. The windiest day of the year is April 11, with an average hourly wind speed of 7.9 miles per hour.
The calmer time of year lasts for 7.0 months, from August 4 to March 5. The calmest day of the year is December 18, with an average hourly wind speed of 6.6 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Fairfield varies throughout the year.
The wind is most often from the west for 9.4 months, from February 23 to December 3, with a peak percentage of 47% on June 10. The wind is most often from the east for 2.7 months, from December 3 to February 23, with a peak percentage of 39% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Fairfield throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Fairfield for general outdoor tourist activities is from early July to mid August, with a peak score in the last week of July.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Fairfield for hot-weather activities is from early July to mid August, with a peak score in the last week of July.
The growing season in Fairfield typically lasts for 4.2 months (131 days), from around May 19 to around September 27, rarely starting before April 28 or after June 16, and rarely ending before September 9 or after October 18.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Fairfield should appear around May 7, only rarely appearing before April 22 or after May 25.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.1 months, from May 16 to August 19, with an average daily incident shortwave energy per square meter above 7.0 kWh. The brightest day of the year is July 2, with an average of 8.3 kWh.
The darker period of the year lasts for 3.5 months, from October 30 to February 12, 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 Fairfield are 43.347 deg latitude, -114.792 deg longitude, and 5,062 ft elevation.
The topography within 2 miles of Fairfield is essentially flat, with a maximum elevation change of 92 feet and an average elevation above sea level of 5,067 feet. Within 10 miles is essentially flat (3,360 feet). Within 50 miles also contains extreme variations in elevation (9,370 feet).
The area within 2 miles of Fairfield is covered by cropland (72%) and grassland (22%), within 10 miles by shrubs (50%) and cropland (28%), and within 50 miles by shrubs (59%) and grassland (17%).
This report illustrates the typical weather in Fairfield, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Fairfield.
For each station, the records are corrected for the elevation difference between that station and Fairfield 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 Fairfield is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Fairfield and a given station.
The stations contributing to this reconstruction are: Friedman Memorial Airport (52%, 43 kilometers, northeast); Jerome County Airport (21%, 74 kilometers, south); Stanley, Stanley Ranger Station (15%, 92 kilometers, north); and Mountain Home Air Force Base (13%, 93 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .