Fairfield, Utah climate: Normal weather by month, frost dates and records
Fairfield's normal year runs from 13°F January nights to 90°F July afternoons, with 12.5 inches of precipitation and 34 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.7°C, January lows of −10°C, July highs of 32°C, 318 mm of precipitation a year.
- NOAA stationFairfield
- Station IDUSC00422696
- Location40.26°N 112.09°W
- Elevation4,880 ft (1,487 m)
- Population158
On October 23, the normal high in Fairfield is 63°F and the normal low 26°F, and the chance of measurable rain or snow is 20%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Fairfield.
- Jan 39° 13°
- Feb 45° 18°
- Mar 56° 25°
- Apr 63° 30°
- May 72° 37°
- Jun 83° 44°
- Jul 90° 51°
- Aug 89° 49°
- Sep 80° 40°
- Oct 67° 29°
- Nov 52° 20°
- Dec 40° 13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Fairfield each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 13°F. The most precipitation falls in May (1.37 in), the least in August (0.66 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 39°F | 13°F | 26.3°F | 1.27 | 10.7 | 8 | <1 | 30 | 9 h 40 min |
| February | 45°F | 18°F | 31.1°F | 1.33 | 5.9 | 7 | <1 | 27 | 10 h 40 min |
| March | 56°F | 25°F | 40.4°F | 1.17 | 3.5 | 8 | <1 | 26 | 11 h 50 min |
| April | 63°F | 30°F | 46.3°F | 1.18 | 1.4 | 9 | <1 | 19 | 13 h 10 min |
| May | 72°F | 37°F | 54.4°F | 1.37 | 0.1 | 7 | <1 | 9 | 14 h 20 min |
| June | 83°F | 44°F | 63.2°F | 0.78 | 0.0 | 4 | 7 | 1 | 15 h |
| July | 90°F | 51°F | 70.6°F | 0.67 | 0.0 | 5 | 19 | <1 | 14 h 50 min |
| August | 89°F | 49°F | 69.0°F | 0.66 | 0.0 | 6 | 14 | <1 | 13 h 50 min |
| September | 80°F | 40°F | 60.2°F | 0.82 | 0.0 | 5 | 2 | 6 | 12 h 30 min |
| October | 67°F | 29°F | 47.6°F | 1.15 | 0.7 | 6 | <1 | 22 | 11 h 10 min |
| November | 52°F | 20°F | 35.8°F | 0.79 | 3.4 | 6 | <1 | 27 | 10 h |
| December | 40°F | 13°F | 26.7°F | 1.32 | 7.9 | 7 | <1 | 30 | 9 h 20 min |
| Year (annual) | 65°F | 31°F | 47.6°F | 12.51 | 33.6 | 79 | 43 | 197 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −10°C | −3.2°C | 32 mm | 27 cm |
| February | 7°C | −8°C | −0.5°C | 34 mm | 15 cm |
| March | 13°C | −4°C | 4.7°C | 30 mm | 9 cm |
| April | 17°C | −1°C | 7.9°C | 30 mm | 4 cm |
| May | 22°C | 3°C | 12.4°C | 35 mm | 0 cm |
| June | 28°C | 7°C | 17.3°C | 20 mm | 0 cm |
| July | 32°C | 11°C | 21.4°C | 17 mm | 0 cm |
| August | 31°C | 10°C | 20.6°C | 17 mm | 0 cm |
| September | 27°C | 5°C | 15.7°C | 21 mm | 0 cm |
| October | 19°C | −2°C | 8.7°C | 29 mm | 2 cm |
| November | 11°C | −7°C | 2.1°C | 20 mm | 9 cm |
| December | 5°C | −10°C | −2.9°C | 34 mm | 20 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422696; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Fairfield?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, June has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422696.
When is the last frost in Fairfield?
In Fairfield, the last spring frost (32°F) comes after June 2 in half of years and after June 24 in one year in ten; the first autumn frost comes before September 16 in half of years and before September 1 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- June 21 year in 10 after June 24; 9 in 10 after May 18
- First autumn frost, half of years before
- September 161 year in 10 before September 1; 9 in 10 before September 29
NOAA puts the median frost-free season at 103 days, and the season without a hard freeze (28°F) at 127 days.
A hard freeze (28°F) comes after May 19 in half of springs and before September 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Fairfield in zone 6a in ZIP code 84013. By the map's own method, the average of each year's coldest night over 1991-2020, Fairfield's NOAA station is in zone 5b: the coldest night of a typical year reaches −11°F (18 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Utah · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00422696; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Fairfield?
In a normal year in Fairfield, 43 days a year reach 90°F (1 of them 100°F or more), 197 nights fall to 32°F or colder and 79 days bring measurable precipitation.
- Days at 90°F or more
- 43a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 197a normal year
- Days that stay below freezing
- 18high of 32°F or less
- Days with 0.01 inch of precipitation
- 79a normal year
- Days with 1 inch of snow or more
- 12a normal year
The highest temperature in this station's record (since 1950) is 104°F, on July 12, 2026; the lowest is −36°F, on February 6, 1989.
The wettest calendar year on that record is 1983, with 24.08 in; the snowiest season is 1983–84, with 92.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00422696; records: ACIS (NOAA Regional Climate Centers), station USC00422696. Records use complete months only; a month missing more than three days is left out.
How sunny is Fairfield?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Fairfield, 4.8 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 69% | 2.1 |
| February | 71% | 3.1 |
| March | 75% | 4.4 |
| April | 77% | 5.8 |
| May | 80% | 6.8 |
| June | 88% | 7.8 |
| July | 88% | 7.4 |
| August | 87% | 6.6 |
| September | 87% | 5.4 |
| October | 82% | 3.9 |
| November | 75% | 2.5 |
| December | 66% | 1.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Fairfield need?
A normal year in Fairfield brings 6,713 heating degree days, 25% more than the median U.S. place (5,373), and 406 cooling degree days, 55% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,217 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,200 | 0 |
| February | 950 | 0 |
| March | 763 | 0 |
| April | 561 | 0 |
| May | 331 | 4 |
| June | 108 | 54 |
| July | 9 | 183 |
| August | 17 | 140 |
| September | 170 | 25 |
| October | 541 | 0 |
| November | 876 | 0 |
| December | 1,187 | 0 |
| Year (annual) | 6,713 | 406 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422696. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Fairfield been warmer than normal lately?
2024 averaged 49.7°F, 2.1°F above the 1991-2020 normal of 47.6°F.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2024 | 49.7°F | +2.1°F | – | – |
Over 38 complete years from 1956 to 2024, the station's annual mean temperature rose at a fitted 2.7°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00422696; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Fairfield's climate compare?
Fairfield is warmer than 37 of the other 96 places with their own NOAA record in Utah, and wetter than 41. Across the 7,247 U.S. stations with normals, its annual mean of 47.6°F is warmer than 30%.
In the Köppen classification computed from these normals, Fairfield is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Fairfield share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Eagle Mountain, UTalso near: Saratoga Springs (7 mi, 50.7°F a year); Draper (13 mi, 54.5°F a year)60,575 people · 5 mi NE
- Cedar Fort, UT420 people · 6 mi N
- Ophir, UT26 people · 11 mi NW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Fairfield's climate
What is the coldest month in Fairfield?
January, with a normal high of 39°F and a normal low of 13°F. The warmest is July (90°F by day, 51°F at night).
Does it snow in Fairfield?
Yes: 34 inches in a normal year, falling on 17 days with 0.1 inch or more, the most in January (10.7 inches).
What is the rainiest month in Fairfield?
May, with 1.37 in of precipitation in a normal year; the driest is August with 0.66 in.
What plant hardiness zone is Fairfield in?
The USDA's 2023 map puts Fairfield in zone 6a in ZIP code 84013. By the same method at Fairfield's NOAA station, the coldest night of a typical year reaches −11°F (18 years, 1991-2020): zone 5b.
How late can frost come in Fairfield?
In half of years the last 32°F night comes after June 2; in one year in ten it comes after June 24. Waiting until June 24 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Saratoga Springs, UT12 miles from this station, 50.7°F a year
- Draper, UT19 miles from this station, 54.5°F a year
- Orem, UT19 miles from this station, 52.9°F a year
- Pleasant Grove, UT20 miles from this station, 54.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made