Rosette, Utah climate: Climate normals at a NOAA weather station
Rosette's normal year runs from 16°F January nights to 86°F July afternoons, with 11.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.3°C, January lows of −9°C, July highs of 30°C, 302 mm of precipitation a year.
- NOAA stationRosette
- Station IDUSC00427408
- Location41.82°N 113.41°W
- Elevation5,685 ft (1,733 m)
On October 23, the normal high in Rosette is 57°F and the normal low 33°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Rosette.
- Jan 35° 16°
- Feb 39° 19°
- Mar 48° 27°
- Apr 55° 33°
- May 65° 41°
- Jun 75° 50°
- Jul 86° 59°
- Aug 85° 57°
- Sep 74° 48°
- Oct 60° 35°
- Nov 45° 25°
- Dec 35° 17°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Rosette each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 16°F. The most precipitation falls in May (1.50 in), the least in November (0.60 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 35°F | 16°F | 25.1°F | 1.18 | 8 | <1 | 31 | 9 h 30 min |
| February | 39°F | 19°F | 29.2°F | 0.92 | 7 | <1 | 27 | 10 h 30 min |
| March | 48°F | 27°F | 37.5°F | 0.84 | 6 | <1 | 25 | 11 h 50 min |
| April | 55°F | 33°F | 43.9°F | 1.10 | 7 | <1 | 17 | 13 h 20 min |
| May | 65°F | 41°F | 53.1°F | 1.50 | 10 | <1 | 6 | 14 h 30 min |
| June | 75°F | 50°F | 62.4°F | 0.99 | 6 | 1 | 1 | 15 h 10 min |
| July | 86°F | 59°F | 72.3°F | 0.82 | 5 | 12 | <1 | 15 h |
| August | 85°F | 57°F | 70.9°F | 0.75 | 5 | 8 | <1 | 13 h 50 min |
| September | 74°F | 48°F | 61.0°F | 1.06 | 5 | 1 | 1 | 12 h 30 min |
| October | 60°F | 35°F | 47.8°F | 0.87 | 5 | <1 | 12 | 11 h 10 min |
| November | 45°F | 25°F | 34.9°F | 0.60 | 5 | <1 | 26 | 9 h 50 min |
| December | 35°F | 17°F | 25.8°F | 1.26 | 9 | <1 | 31 | 9 h 10 min |
| Year (annual) | 59°F | 36°F | 47.0°F | 11.89 | 79 | 22 | 175 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −9°C | −3.8°C | 30 mm |
| February | 4°C | −7°C | −1.6°C | 23 mm |
| March | 9°C | −3°C | 3.1°C | 21 mm |
| April | 13°C | 0°C | 6.6°C | 28 mm |
| May | 18°C | 5°C | 11.7°C | 38 mm |
| June | 24°C | 10°C | 16.9°C | 25 mm |
| July | 30°C | 15°C | 22.4°C | 21 mm |
| August | 29°C | 14°C | 21.6°C | 19 mm |
| September | 24°C | 9°C | 16.1°C | 27 mm |
| October | 16°C | 2°C | 8.8°C | 22 mm |
| November | 7°C | −4°C | 1.6°C | 15 mm |
| December | 2°C | −8°C | −3.4°C | 32 mm |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00427408; 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.
Which months are mildest at Rosette?
Normal highs sit between 65°F and 85°F in June, August and September. Of those, September 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 USC00427408.
When is the last frost at Rosette?
In Rosette, the last spring frost (32°F) comes after May 21 in half of years and after June 11 in one year in ten; the first autumn frost comes before October 2 in half of years and before September 17 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 211 year in 10 after June 11; 9 in 10 after May 2
- First autumn frost, half of years before
- October 21 year in 10 before September 17; 9 in 10 before October 17
NOAA puts the median frost-free season at 132 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 Rosette in zone 6a in ZIP code 84329, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 6b: the coldest night of a typical year reaches −4°F (19 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 USC00427408; 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 at Rosette?
In a normal year in Rosette, 22 days a year reach 90°F, 175 nights fall to 32°F or colder and 79 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 175a normal year
- Days that stay below freezing
- 28high of 32°F or less
- Days with 0.01 inch of precipitation
- 79a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00427408.
How sunny is it at Rosette?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds at Rosette, 4.4 kWh per square metre a day. August is the sunniest month (83%) and December the cloudiest (63%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 65% | 1.9 |
| February | 69% | 2.9 |
| March | 70% | 4.1 |
| April | 73% | 5.4 |
| May | 74% | 6.2 |
| June | 80% | 7.1 |
| July | 82% | 6.9 |
| August | 83% | 6.2 |
| September | 81% | 5.0 |
| October | 77% | 3.5 |
| November | 72% | 2.3 |
| December | 63% | 1.6 |
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 many heating and cooling degree days does Rosette record?
A normal year at Rosette brings 7,102 heating degree days, 32% more than the median U.S. place (5,373), and 570 cooling degree days, 37% 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 2,343 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,235 | 0 |
| February | 1,004 | 0 |
| March | 854 | 0 |
| April | 632 | 0 |
| May | 376 | 8 |
| June | 144 | 66 |
| July | 17 | 243 |
| August | 20 | 204 |
| September | 167 | 47 |
| October | 534 | 2 |
| November | 903 | 0 |
| December | 1,217 | 0 |
| Year (annual) | 7,102 | 570 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00427408. 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.
Have recent years at Rosette been warmer than normal?
2025 averaged 51.0°F, 4.0°F above the 1991-2020 normal of 47.0°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 49.2°F | +2.2°F | – |
| 2022 | 48.0°F | +1.0°F | 8.33 |
| 2023 | 47.4°F | +0.4°F | 17.70 |
| 2024 | 50.7°F | +3.7°F | 10.86 |
| 2025 | 51.0°F | +4.0°F | 10.39 |
Source: observed years: ACIS, station USC00427408. A year counts only with all twelve months complete.
How does Rosette's climate compare?
Rosette is warmer than 31 of the 97 places with their own NOAA record in Utah, and wetter than 40. Across the 7,247 U.S. stations with normals, its annual mean of 47.0°F is warmer than 28%.
In the Köppen classification computed from these normals, Rosette 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.
Questions about Rosette's climate
What is the coldest month at Rosette?
January, with a normal high of 35°F and a normal low of 16°F. The warmest is July (86°F by day, 59°F at night).
What is the rainiest month at Rosette?
May, with 1.50 in of precipitation in a normal year; the driest is November with 0.60 in.
What plant hardiness zone is Rosette in?
The USDA's 2023 map puts Rosette in zone 6a in ZIP code 84329, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −4°F (19 years, 1991-2020): zone 6b.
How late can frost come at Rosette?
In half of years the last 32°F night comes after May 21; in one year in ten it comes after June 11. Waiting until June 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Grouse Creek, UT25 miles from this station, 45.2°F a year
- Malta, ID34 miles from this station, 46.2°F a year
- Oakley, ID38 miles from this station, 49.6°F a year
- Brigham City (28 mi WNW), UT47 miles from this station, 47.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made