Bluff, Utah climate: Normal weather by month, frost dates and records
Bluff's normal year runs from 20°F December nights to 96°F July afternoons, with 7.3 inches of precipitation and 7 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.8°C, December lows of −7°C, July highs of 36°C, 185 mm of precipitation a year.
- NOAA stationBluff
- Station IDUSC00420788
- Location37.28°N 109.56°W
- Elevation4,319 ft (1,316 m)
- Population250
On October 22, the normal high in Bluff is 67°F and the normal low 36°F, and the chance of measurable rain or snow is 12%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Bluff.
- Jan 43° 20°
- Feb 51° 25°
- Mar 63° 32°
- Apr 71° 39°
- May 81° 48°
- Jun 92° 56°
- Jul 96° 64°
- Aug 93° 62°
- Sep 84° 52°
- Oct 70° 38°
- Nov 55° 27°
- Dec 43° 20°
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 Bluff each month?
July is the warmest month, with normal highs of 96°F; December the coldest, with normal lows of 20°F. The most precipitation falls in August (0.94 in), the least in June (0.20 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 43°F | 20°F | 31.5°F | 0.83 | 2.5 | 4 | <1 | 29 | 9 h 50 min |
| February | 51°F | 25°F | 38.1°F | 0.62 | 1.6 | 4 | <1 | 23 | 10 h 50 min |
| March | 63°F | 32°F | 47.4°F | 0.47 | 0.3 | 4 | <1 | 18 | 11 h 50 min |
| April | 71°F | 39°F | 55.3°F | 0.34 | 0.0 | 3 | <1 | 7 | 13 h 10 min |
| May | 81°F | 48°F | 64.1°F | 0.50 | 0.0 | 3 | 5 | 1 | 14 h 10 min |
| June | 92°F | 56°F | 73.7°F | 0.20 | 0.0 | 1 | 22 | <1 | 14 h 40 min |
| July | 96°F | 64°F | 79.8°F | 0.62 | 0.0 | 5 | 29 | <1 | 14 h 30 min |
| August | 93°F | 62°F | 77.4°F | 0.94 | 0.0 | 5 | 26 | <1 | 13 h 40 min |
| September | 84°F | 52°F | 68.0°F | 0.84 | 0.0 | 4 | 8 | <1 | 12 h 30 min |
| October | 70°F | 38°F | 54.2°F | 0.77 | 0.1 | 4 | <1 | 9 | 11 h 20 min |
| November | 55°F | 27°F | 40.9°F | 0.48 | 0.3 | 3 | <1 | 24 | 10 h 10 min |
| December | 43°F | 20°F | 31.4°F | 0.67 | 2.6 | 4 | <1 | 29 | 9 h 40 min |
| Year (annual) | 70°F | 40°F | 55.1°F | 7.28 | 7.4 | 43 | 90 | 140 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −7°C | −0.3°C | 21 mm | 6 cm |
| February | 11°C | −4°C | 3.4°C | 16 mm | 4 cm |
| March | 17°C | 0°C | 8.6°C | 12 mm | 1 cm |
| April | 22°C | 4°C | 12.9°C | 9 mm | 0 cm |
| May | 27°C | 9°C | 17.8°C | 13 mm | 0 cm |
| June | 33°C | 13°C | 23.2°C | 5 mm | 0 cm |
| July | 36°C | 18°C | 26.6°C | 16 mm | 0 cm |
| August | 34°C | 17°C | 25.2°C | 24 mm | 0 cm |
| September | 29°C | 11°C | 20.0°C | 21 mm | 0 cm |
| October | 21°C | 3°C | 12.3°C | 20 mm | 0 cm |
| November | 13°C | −3°C | 4.9°C | 12 mm | 1 cm |
| December | 6°C | −7°C | −0.3°C | 17 mm | 7 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420788; 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 Bluff?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, April has the fewest days with rain (3).
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 USC00420788.
When is the last frost in Bluff?
In Bluff, the last spring frost (32°F) comes after April 24 in half of years and after May 9 in one year in ten; the first autumn frost comes before October 13 in half of years and before October 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
- April 241 year in 10 after May 9; 9 in 10 after April 8
- First autumn frost, half of years before
- October 131 year in 10 before October 1; 9 in 10 before October 28
NOAA puts the median frost-free season at 172 days, and the season without a hard freeze (28°F) at 196 days.
A hard freeze (28°F) comes after April 9 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Bluff in zone 7a in ZIP code 84512, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Bluff's NOAA station is in zone 7a: the coldest night of a typical year reaches 3°F (28 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 USC00420788; 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 Bluff?
In a normal year in Bluff, 90 days a year reach 90°F (16 of them 100°F or more), 140 nights fall to 32°F or colder and 43 days bring measurable precipitation.
- Days at 90°F or more
- 90a normal year
- Days at 100°F or more
- 16a normal year
- Nights at 32°F or colder
- 140a normal year
- Days that stay below freezing
- 5high of 32°F or less
- Days with 0.01 inch of precipitation
- 43a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1911) is 109°F, on July 14, 2003; the lowest is −22°F, on January 13, 1963.
The wettest calendar year on that record is 1957, with 15.69 in; the snowiest season is 1978–79, with 28.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00420788; records: ACIS (NOAA Regional Climate Centers), station USC00420788. Records use complete months only; a month missing more than three days is left out.
How sunny is Bluff?
Over a year 86% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Bluff, 5.4 kWh per square metre a day. June is the sunniest month (92%) and December the cloudiest (77%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 79% | 2.8 |
| February | 78% | 3.7 |
| March | 84% | 5.3 |
| April | 85% | 6.7 |
| May | 87% | 7.6 |
| June | 92% | 8.4 |
| July | 88% | 7.5 |
| August | 87% | 6.7 |
| September | 88% | 5.8 |
| October | 87% | 4.5 |
| November | 85% | 3.2 |
| December | 77% | 2.5 |
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 Bluff need?
A normal year in Bluff brings 4,886 heating degree days, 9% fewer than the median U.S. place (5,373), and 1,321 cooling degree days, 46% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,873 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,040 | 0 |
| February | 753 | 0 |
| March | 547 | 0 |
| April | 297 | 5 |
| May | 97 | 71 |
| June | 8 | 267 |
| July | 0 | 460 |
| August | 0 | 385 |
| September | 39 | 129 |
| October | 339 | 4 |
| November | 722 | 0 |
| December | 1,043 | 0 |
| Year (annual) | 4,886 | 1,321 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420788. 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 Bluff been warmer than normal lately?
2025 averaged 57.6°F, 2.5°F above the 1991-2020 normal of 55.1°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 56.6°F | +1.5°F | 5.66 | 4.3 |
| 2022 | 55.9°F | +0.8°F | 8.03 | 8.1 |
| 2023 | 55.5°F | +0.4°F | 6.55 | 8.0 |
| 2024 | 57.2°F | +2.1°F | 6.17 | 3.2 |
| 2025 | 57.6°F | +2.5°F | 6.81 | 0.4 |
Over 66 complete years from 1928 to 2025, the station's annual mean temperature rose at a fitted 2.9°F per century (+0.16°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00420788; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Bluff's climate compare?
Bluff is warmer than 89 of the other 96 places with their own NOAA record in Utah, and wetter than 5. Across the 7,247 U.S. stations with normals, its annual mean of 55.1°F is warmer than 61%.
In the Köppen classification computed from these normals, Bluff is BWk: cold desert. 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 Bluff 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.
- Red Mesa, AZ470 people · 24 mi SE
- Montezuma Creek, UT256 people · 14 mi E
- Tselakai Dezza, UT92 people · 6 mi SW
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 Bluff's climate
What is the coldest month in Bluff?
December, with a normal high of 43°F and a normal low of 20°F. The warmest is July (96°F by day, 64°F at night).
Does it snow in Bluff?
Yes: 7 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in December (2.6 inches).
What is the rainiest month in Bluff?
August, with 0.94 in of precipitation in a normal year; the driest is June with 0.20 in.
What plant hardiness zone is Bluff in?
The USDA's 2023 map puts Bluff in zone 7a in ZIP code 84512, the nearest ZIP area. By the same method at Bluff's NOAA station, the coldest night of a typical year reaches 3°F (28 years, 1991-2020): zone 7a.
How late can frost come in Bluff?
In half of years the last 32°F night comes after April 24; in one year in ten it comes after May 9. Waiting until May 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Mexican Hat, UT19 miles from this station, 58.2°F a year
- Valley Of The Gods, UT21 miles from this station, 57.3°F a year
- Blanding, UT23 miles from this station, 52.4°F a year
- Hovenweep National Monument, UT27 miles from this station, 53.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made