Fort Duchesne, Utah climate: Normal weather by month, frost dates and records
Fort Duchesne's normal year runs from 5°F January nights to 92°F July afternoons, with 6.0 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.2°C, January lows of −15°C, July highs of 33°C, 153 mm of precipitation a year.
- NOAA stationFort Duchesne
- Station IDUSC00422996
- Location40.28°N 109.86°W
- Elevation5,052 ft (1,540 m)
- Population (census place)375
On October 23, the normal high in Fort Duchesne is 61°F and the normal low 30°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Fort Duchesne.
- Jan 29° 5°
- Feb 38° 13°
- Mar 53° 24°
- Apr 63° 31°
- May 73° 40°
- Jun 85° 47°
- Jul 92° 55°
- Aug 89° 53°
- Sep 79° 44°
- Oct 64° 33°
- Nov 47° 21°
- Dec 32° 10°
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 Fort Duchesne each month?
July is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 5°F. The most precipitation falls in October (0.86 in), the least in July (0.31 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 29°F | 5°F | 16.7°F | 0.38 | 5 | <1 | 31 | 9 h 40 min |
| February | 38°F | 13°F | 25.2°F | 0.44 | 4 | <1 | 27 | 10 h 40 min |
| March | 53°F | 24°F | 38.8°F | 0.40 | 3 | <1 | 27 | 11 h 50 min |
| April | 63°F | 31°F | 47.2°F | 0.45 | 4 | <1 | 16 | 13 h 10 min |
| May | 73°F | 40°F | 56.3°F | 0.63 | 4 | 1 | 4 | 14 h 20 min |
| June | 85°F | 47°F | 65.9°F | 0.42 | 2 | 12 | 1 | 15 h |
| July | 92°F | 55°F | 73.6°F | 0.31 | 3 | 23 | <1 | 14 h 50 min |
| August | 89°F | 53°F | 71.0°F | 0.62 | 5 | 19 | <1 | 13 h 50 min |
| September | 79°F | 44°F | 61.8°F | 0.81 | 4 | 4 | 1 | 12 h 30 min |
| October | 64°F | 33°F | 48.7°F | 0.86 | 4 | <1 | 15 | 11 h 10 min |
| November | 47°F | 21°F | 34.3°F | 0.33 | 3 | <1 | 28 | 10 h |
| December | 32°F | 10°F | 20.6°F | 0.36 | 4 | <1 | 31 | 9 h 20 min |
| Year (annual) | 62°F | 31°F | 46.7°F | 6.01 | 45 | 59 | 182 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | −2°C | −15°C | −8.5°C | 10 mm |
| February | 3°C | −11°C | −3.8°C | 11 mm |
| March | 12°C | −4°C | 3.8°C | 10 mm |
| April | 17°C | 0°C | 8.4°C | 11 mm |
| May | 23°C | 4°C | 13.5°C | 16 mm |
| June | 29°C | 8°C | 18.8°C | 11 mm |
| July | 33°C | 13°C | 23.1°C | 8 mm |
| August | 32°C | 12°C | 21.7°C | 16 mm |
| September | 26°C | 7°C | 16.6°C | 21 mm |
| October | 18°C | 1°C | 9.3°C | 22 mm |
| November | 8°C | −6°C | 1.3°C | 8 mm |
| December | 0°C | −12°C | −6.3°C | 9 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Roosevelt (5 miles away), gets 16 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422996; 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 Fort Duchesne?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, June has the fewest days with rain (2).
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 USC00422996.
When is the last frost in Fort Duchesne?
In Fort Duchesne, the last spring frost (32°F) comes after May 19 in half of years and after June 15 in one year in ten; the first autumn frost comes before October 2 in half of years and before September 19 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
- May 191 year in 10 after June 15; 9 in 10 after May 1
- First autumn frost, half of years before
- October 21 year in 10 before September 19; 9 in 10 before October 16
NOAA puts the median frost-free season at 135 days, and the season without a hard freeze (28°F) at 161 days.
A hard freeze (28°F) comes after May 3 in half of springs and before October 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Fort Duchesne in zone 5b in ZIP code 84026. By the map's own method, the average of each year's coldest night over 1991-2020, Fort Duchesne's NOAA station is in zone 5b: the coldest night of a typical year reaches −13°F (17 complete years).
Frost dates for every NOAA station in Utah · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00422996; 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 Fort Duchesne?
In a normal year in Fort Duchesne, 59 days a year reach 90°F (4 of them 100°F or more), 182 nights fall to 32°F or colder and 45 days bring measurable precipitation.
- Days at 90°F or more
- 59a normal year
- Days at 100°F or more
- 4a normal year
- Nights at 32°F or colder
- 182a normal year
- Days that stay below freezing
- 45high of 32°F or less
- Days with 0.01 inch of precipitation
- 45a normal year
The highest temperature in this station's record (since 1887) is 107°F, on July 12, 1905; the lowest is −39°F, on December 24, 1990.
The wettest calendar year on that record is 1965, with 13.67 in; the snowiest season is 1964–65, with 44.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00422996; records: ACIS (NOAA Regional Climate Centers), station USC00422996. Records use complete months only; a month missing more than three days is left out.
How sunny is Fort Duchesne?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Fort Duchesne, 4.8 kWh per square metre a day. September is the sunniest month (86%) and December the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 74% | 2.4 |
| February | 74% | 3.3 |
| March | 74% | 4.5 |
| April | 76% | 5.8 |
| May | 79% | 6.8 |
| June | 85% | 7.7 |
| July | 84% | 7.2 |
| August | 84% | 6.4 |
| September | 86% | 5.4 |
| October | 83% | 3.9 |
| November | 78% | 2.6 |
| December | 71% | 2.0 |
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 Fort Duchesne need?
A normal year in Fort Duchesne brings 7,258 heating degree days, 35% more than the median U.S. place (5,373), and 608 cooling degree days, 33% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,582 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,499 | 0 |
| February | 1,114 | 0 |
| March | 812 | 0 |
| April | 536 | 0 |
| May | 281 | 10 |
| June | 69 | 96 |
| July | 4 | 269 |
| August | 9 | 197 |
| September | 132 | 36 |
| October | 504 | 0 |
| November | 921 | 0 |
| December | 1,376 | 0 |
| Year (annual) | 7,258 | 608 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00422996. 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 Fort Duchesne been warmer than normal lately?
2024 averaged 50.2°F, 3.5°F above the 1991-2020 normal of 46.7°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 48.8°F | +2.1°F | 6.56 |
| 2022 | 47.4°F | +0.7°F | 5.88 |
| 2023 | 44.7°F | −2.0°F | – |
| 2024 | 50.2°F | +3.5°F | – |
Over 59 complete years from 1895 to 2024, the station's annual mean temperature rose at a fitted 4.2°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00422996; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Fort Duchesne's climate compare?
Fort Duchesne is warmer than 28 of the other 96 places with their own NOAA record in Utah, and wetter than 1. Across the 7,247 U.S. stations with normals, its annual mean of 46.7°F is warmer than 26%.
In the Köppen classification computed from these normals, Fort Duchesne is BSk: cold semi-arid steppe. 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 Fort Duchesne share this climate record?
2 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.
- Randlett, UT111 people · 4 mi S
- Lapoint, UT49 people · 9 mi N
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 Fort Duchesne's climate
What is the coldest month in Fort Duchesne?
January, with a normal high of 29°F and a normal low of 5°F. The warmest is July (92°F by day, 55°F at night).
Does it snow in Fort Duchesne?
Yes. NOAA publishes no 1991-2020 snowfall normal for Fort Duchesne's NOAA station; the nearest record that keeps one, Roosevelt (5 miles away), records 16 inches of snow in a normal year.
What is the rainiest month in Fort Duchesne?
October, with 0.86 in of precipitation in a normal year; the driest is July with 0.31 in.
What plant hardiness zone is Fort Duchesne in?
The USDA's 2023 map puts Fort Duchesne in zone 5b in ZIP code 84026. By the same method at Fort Duchesne's NOAA station, the coldest night of a typical year reaches −13°F (17 years, 1991-2020): zone 5b.
How late can frost come in Fort Duchesne?
In half of years the last 32°F night comes after May 19; in one year in ten it comes after June 15. Waiting until June 15 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Roosevelt, UT5 miles from this station, 46.2°F a year
- Myton, UT12 miles from this station, 48.0°F a year
- Neola, UT14 miles from this station, 45.4°F a year
- Ouray (4 mi NE), UT16 miles from this station, 48.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made