Altamont, Utah climate: Normal weather by month, frost dates and records
Altamont's normal year runs from 7°F January nights to 82°F July afternoons, with 9.4 inches of precipitation and 39 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 5.7°C, January lows of −14°C, July highs of 28°C, 240 mm of precipitation a year.
- NOAA stationAltamont
- Station IDUSC00420074
- Location40.37°N 110.30°W
- Elevation6,456 ft (1,968 m)
- From the centerunder 1 mile
- Population250
On October 23, the normal high in Altamont is 54°F and the normal low 27°F, and the chance of measurable rain or snow is 16%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Altamont.
- Jan 29° 7°
- Feb 35° 12°
- Mar 47° 21°
- Apr 55° 27°
- May 64° 36°
- Jun 75° 44°
- Jul 82° 52°
- Aug 80° 50°
- Sep 71° 41°
- Oct 57° 30°
- Nov 43° 18°
- Dec 29° 8°
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 Altamont each month?
July is the warmest month, with normal highs of 82°F; January the coldest, with normal lows of 7°F. The most precipitation falls in September (1.24 in), the least in November (0.51 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 29°F | 7°F | 17.8°F | 0.69 | 10.8 | 5 | <1 | 31 | 9 h 40 min |
| February | 35°F | 12°F | 23.1°F | 0.62 | 7.5 | 5 | <1 | 28 | 10 h 40 min |
| March | 47°F | 21°F | 33.9°F | 0.53 | 3.0 | 4 | <1 | 28 | 11 h 50 min |
| April | 55°F | 27°F | 41.1°F | 0.83 | 3.2 | 5 | <1 | 21 | 13 h 10 min |
| May | 64°F | 36°F | 50.2°F | 1.08 | 0.1 | 7 | <1 | 8 | 14 h 20 min |
| June | 75°F | 44°F | 59.5°F | 0.77 | 0.0 | 5 | 1 | 1 | 15 h |
| July | 82°F | 52°F | 66.9°F | 0.60 | 0.0 | 5 | 5 | <1 | 14 h 50 min |
| August | 80°F | 50°F | 65.0°F | 0.96 | 0.0 | 7 | 1 | <1 | 13 h 50 min |
| September | 71°F | 41°F | 56.1°F | 1.24 | 0.1 | 6 | <1 | 2 | 12 h 30 min |
| October | 57°F | 30°F | 43.6°F | 0.99 | 0.8 | 5 | <1 | 16 | 11 h 10 min |
| November | 43°F | 18°F | 30.5°F | 0.51 | 4.2 | 4 | <1 | 28 | 10 h |
| December | 29°F | 8°F | 18.9°F | 0.62 | 9.0 | 5 | <1 | 31 | 9 h 20 min |
| Year (annual) | 56°F | 29°F | 42.2°F | 9.44 | 38.7 | 62 | 8 | 194 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −2°C | −14°C | −7.9°C | 18 mm | 27 cm |
| February | 2°C | −11°C | −4.9°C | 16 mm | 19 cm |
| March | 8°C | −6°C | 1.1°C | 13 mm | 8 cm |
| April | 13°C | −3°C | 5.1°C | 21 mm | 8 cm |
| May | 18°C | 2°C | 10.1°C | 27 mm | 0 cm |
| June | 24°C | 7°C | 15.3°C | 20 mm | 0 cm |
| July | 28°C | 11°C | 19.4°C | 15 mm | 0 cm |
| August | 27°C | 10°C | 18.3°C | 24 mm | 0 cm |
| September | 22°C | 5°C | 13.4°C | 31 mm | 0 cm |
| October | 14°C | −1°C | 6.4°C | 25 mm | 2 cm |
| November | 6°C | −8°C | −0.8°C | 13 mm | 11 cm |
| December | −1°C | −13°C | −7.3°C | 16 mm | 23 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420074; 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 Altamont?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, June has the fewest days with rain (5).
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 USC00420074.
When is the last frost in Altamont?
In Altamont, the last spring frost (32°F) comes after May 31 in half of years and after June 16 in one year in ten; the first autumn frost comes before September 23 in half of years and before September 6 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 311 year in 10 after June 16; 9 in 10 after May 16
- First autumn frost, half of years before
- September 231 year in 10 before September 6; 9 in 10 before October 5
NOAA puts the median frost-free season at 112 days, and the season without a hard freeze (28°F) at 136 days.
A hard freeze (28°F) comes after May 17 in half of springs and before October 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Altamont in zone 5b in ZIP code 84001, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Altamont's NOAA station is in zone 5b: the coldest night of a typical year reaches −11°F (24 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 USC00420074; 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 Altamont?
In a normal year in Altamont, 8 days a year reach 90°F, 194 nights fall to 32°F or colder and 62 days bring measurable precipitation.
- Days at 90°F or more
- 8a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 194a normal year
- Days that stay below freezing
- 48high of 32°F or less
- Days with 0.01 inch of precipitation
- 62a normal year
- Days with 1 inch of snow or more
- 15a normal year
The highest temperature in this station's record (since 1948) is 98°F, on June 29, 2013; the lowest is −32°F, on February 14, 1949.
The wettest calendar year on that record is 1997, with 15.13 in; the snowiest season is 1966–67, with 74.1 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00420074; records: ACIS (NOAA Regional Climate Centers), station USC00420074. Records use complete months only; a month missing more than three days is left out.
How sunny is Altamont?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Altamont, 4.8 kWh per square metre a day. September is the sunniest month (83%) and April the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 78% | 2.5 |
| February | 77% | 3.4 |
| March | 76% | 4.7 |
| April | 74% | 5.7 |
| May | 74% | 6.5 |
| June | 83% | 7.6 |
| July | 80% | 7.0 |
| August | 80% | 6.2 |
| September | 83% | 5.3 |
| October | 81% | 3.9 |
| November | 77% | 2.6 |
| December | 74% | 2.1 |
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 Altamont need?
A normal year in Altamont brings 8,450 heating degree days, 57% more than the median U.S. place (5,373), and 182 cooling degree days, 80% 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 1,641 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,463 | 0 |
| February | 1,172 | 0 |
| March | 963 | 0 |
| April | 715 | 0 |
| May | 460 | 1 |
| June | 187 | 23 |
| July | 38 | 98 |
| August | 55 | 55 |
| September | 271 | 4 |
| October | 662 | 0 |
| November | 1,035 | 0 |
| December | 1,429 | 0 |
| Year (annual) | 8,450 | 182 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420074. 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 Altamont been warmer than normal lately?
2025 averaged 46.5°F, 4.3°F above the 1991-2020 normal of 42.2°F. 3 of the 4 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 44.7°F | +2.5°F | 8.33 | 31.1 |
| 2022 | 43.1°F | +0.9°F | 7.67 | 23.4 |
| 2023 | 41.2°F | −1.0°F | 7.81 | 46.0 |
| 2025 | 46.5°F | +4.3°F | 6.43 | 15.8 |
Over 52 complete years from 1954 to 2025, the station's annual mean temperature rose at a fitted 3.3°F per century (+0.18°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00420074; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Altamont's climate compare?
Altamont is warmer than 5 of the other 96 places with their own NOAA record in Utah, and wetter than 26. Across the 7,247 U.S. stations with normals, its annual mean of 42.2°F is warmer than 10%.
In the Köppen classification computed from these normals, Altamont 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 Altamont share this climate record?
Bluebell has no NOAA station with 1991-2020 normals of its 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.
- Bluebell, UT272 people · 4 mi E
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 Altamont's climate
What is the coldest month in Altamont?
January, with a normal high of 29°F and a normal low of 7°F. The warmest is July (82°F by day, 52°F at night).
Does it snow in Altamont?
Yes: 39 inches in a normal year, falling on 19 days with 0.1 inch or more, the most in January (10.8 inches).
What is the rainiest month in Altamont?
September, with 1.24 in of precipitation in a normal year; the driest is November with 0.51 in.
What plant hardiness zone is Altamont in?
The USDA's 2023 map puts Altamont in zone 5b in ZIP code 84001, the nearest ZIP area. By the same method at Altamont's NOAA station, the coldest night of a typical year reaches −11°F (24 years, 1991-2020): zone 5b.
How late can frost come in Altamont?
In half of years the last 32°F night comes after May 31; in one year in ten it comes after June 16. Waiting until June 16 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Neola, UT14 miles from this station, 45.4°F a year
- Duchesne, UT14 miles from this station, 48.1°F a year
- Moon Lake, UT17 miles from this station, 40.3°F a year
- Myton, UT17 miles from this station, 48.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made