Alpine, Utah climate: Normal weather by month, frost dates and records
Alpine's normal year runs from 22°F January nights to 90°F July afternoons, with 21.1 inches of precipitation and 74 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.6°C, January lows of −6°C, July highs of 32°C, 536 mm of precipitation a year.
- NOAA stationAlpine
- Station IDUSC00420061
- Location40.46°N 111.77°W
- Elevation5,100 ft (1,555 m)
- Population10,548
On October 22, the normal high in Alpine is 62°F and the normal low 37°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Alpine.
- Jan 39° 22°
- Feb 44° 25°
- Mar 54° 32°
- Apr 61° 37°
- May 71° 44°
- Jun 82° 51°
- Jul 90° 59°
- Aug 87° 58°
- Sep 79° 49°
- Oct 65° 39°
- Nov 50° 29°
- Dec 39° 22°
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 Alpine each month?
July is the warmest month, with normal highs of 90°F; January the coldest, with normal lows of 22°F. The most precipitation falls in January (2.50 in), the least in July (0.64 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 39°F | 22°F | 30.1°F | 2.50 | 17.4 | 10 | <1 | 28 | 9 h 30 min |
| February | 44°F | 25°F | 34.5°F | 2.03 | 13.6 | 9 | <1 | 23 | 10 h 40 min |
| March | 54°F | 32°F | 43.1°F | 2.03 | 9.6 | 9 | <1 | 17 | 11 h 50 min |
| April | 61°F | 37°F | 48.8°F | 2.49 | 6.2 | 10 | <1 | 9 | 13 h 10 min |
| May | 71°F | 44°F | 57.2°F | 2.42 | 0.5 | 9 | <1 | 2 | 14 h 20 min |
| June | 82°F | 51°F | 66.8°F | 1.00 | 0.0 | 5 | 6 | <1 | 15 h |
| July | 90°F | 59°F | 74.0°F | 0.64 | 0.0 | 4 | 17 | <1 | 14 h 50 min |
| August | 87°F | 58°F | 72.4°F | 0.95 | 0.0 | 6 | 11 | <1 | 13 h 50 min |
| September | 79°F | 49°F | 63.7°F | 1.33 | 0.0 | 6 | 1 | <1 | 12 h 30 min |
| October | 65°F | 39°F | 51.9°F | 1.84 | 1.6 | 7 | <1 | 7 | 11 h 10 min |
| November | 50°F | 29°F | 39.8°F | 1.63 | 8.0 | 7 | <1 | 19 | 10 h |
| December | 39°F | 22°F | 30.2°F | 2.26 | 17.5 | 9 | <1 | 27 | 9 h 20 min |
| Year (annual) | 63°F | 39°F | 51.1°F | 21.12 | 74.4 | 93 | 36 | 133 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 4°C | −6°C | −1.1°C | 64 mm | 44 cm |
| February | 7°C | −4°C | 1.4°C | 52 mm | 35 cm |
| March | 12°C | 0°C | 6.2°C | 52 mm | 24 cm |
| April | 16°C | 3°C | 9.3°C | 63 mm | 16 cm |
| May | 21°C | 7°C | 14.0°C | 61 mm | 1 cm |
| June | 28°C | 11°C | 19.3°C | 25 mm | 0 cm |
| July | 32°C | 15°C | 23.3°C | 16 mm | 0 cm |
| August | 31°C | 14°C | 22.4°C | 24 mm | 0 cm |
| September | 26°C | 9°C | 17.6°C | 34 mm | 0 cm |
| October | 18°C | 4°C | 11.1°C | 47 mm | 4 cm |
| November | 10°C | −1°C | 4.3°C | 41 mm | 20 cm |
| December | 4°C | −6°C | −1.0°C | 57 mm | 44 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420061; 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 Alpine?
Normal highs sit between 65°F and 85°F in May, June, September and October. 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 USC00420061.
When is the last frost in Alpine?
In Alpine, the last spring frost (32°F) comes after May 3 in half of years and after May 26 in one year in ten; the first autumn frost comes before October 12 in half of years and before September 29 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 31 year in 10 after May 26; 9 in 10 after April 18
- First autumn frost, half of years before
- October 121 year in 10 before September 29; 9 in 10 before October 26
NOAA puts the median frost-free season at 159 days, and the season without a hard freeze (28°F) at 190 days.
A hard freeze (28°F) comes after April 16 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Alpine in zone 7a in ZIP code 84004. By the map's own method, the average of each year's coldest night over 1991-2020, Alpine's NOAA station is in zone 7a: the coldest night of a typical year reaches 2°F (26 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 USC00420061; 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 Alpine?
In a normal year in Alpine, 36 days a year reach 90°F, 133 nights fall to 32°F or colder and 93 days bring measurable precipitation.
- Days at 90°F or more
- 36a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 133a normal year
- Days that stay below freezing
- 19high of 32°F or less
- Days with 0.01 inch of precipitation
- 93a normal year
- Days with 1 inch of snow or more
- 24a normal year
The highest temperature in this station's record (since 1965) is 105°F, on August 4, 1979; the lowest is −20°F, on February 6, 1982.
The wettest calendar year on that record is 2019, with 29.29 in; the snowiest season is 2007–08, with 137.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00420061; records: ACIS (NOAA Regional Climate Centers), station USC00420061. Records use complete months only; a month missing more than three days is left out.
How sunny is Alpine?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Alpine, 4.8 kWh per square metre a day. July is the sunniest month (88%) and December the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 71% | 2.3 |
| February | 72% | 3.2 |
| March | 75% | 4.5 |
| April | 74% | 5.6 |
| May | 77% | 6.6 |
| June | 86% | 7.8 |
| July | 88% | 7.5 |
| August | 86% | 6.6 |
| September | 85% | 5.4 |
| October | 80% | 3.8 |
| November | 72% | 2.5 |
| December | 67% | 1.9 |
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 Alpine need?
A normal year in Alpine brings 5,776 heating degree days, 8% more than the median U.S. place (5,373), and 722 cooling degree days, 20% 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 2,867 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,082 | 0 |
| February | 855 | 0 |
| March | 679 | 0 |
| April | 485 | 1 |
| May | 258 | 18 |
| June | 65 | 119 |
| July | 3 | 281 |
| August | 6 | 236 |
| September | 101 | 64 |
| October | 407 | 3 |
| November | 756 | 0 |
| December | 1,078 | 0 |
| Year (annual) | 5,776 | 722 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00420061. 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 Alpine been warmer than normal lately?
2025 averaged 54.3°F, 3.2°F above the 1991-2020 normal of 51.1°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 52.9°F | +1.8°F | 18.49 | 72.8 |
| 2022 | 51.4°F | +0.3°F | 16.72 | 54.3 |
| 2023 | 51.2°F | +0.1°F | 28.33 | 117.6 |
| 2024 | 53.0°F | +1.9°F | 22.10 | 58.8 |
| 2025 | 54.3°F | +3.2°F | 16.00 | 44.6 |
Source: observed years: ACIS, station USC00420061. A year counts only with all twelve months complete.
How does Alpine's climate compare?
Alpine is warmer than 63 of the other 96 places with their own NOAA record in Utah, and wetter than 82. Across the 7,247 U.S. stations with normals, its annual mean of 51.1°F is warmer than 45%.
In the Köppen classification computed from these normals, Alpine is Dsa: continental, dry-summer, hot 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 Alpine share this climate record?
Highland 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.
- Highland, UT21,146 people · 3 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 Alpine's climate
What is the coldest month in Alpine?
January, with a normal high of 39°F and a normal low of 22°F. The warmest is July (90°F by day, 59°F at night).
Does it snow in Alpine?
Yes: 74 inches in a normal year, falling on 29 days with 0.1 inch or more, the most in December (17.5 inches).
What is the rainiest month in Alpine?
January, with 2.50 in of precipitation in a normal year; the driest is July with 0.64 in.
What plant hardiness zone is Alpine in?
The USDA's 2023 map puts Alpine in zone 7a in ZIP code 84004. By the same method at Alpine's NOAA station, the coldest night of a typical year reaches 2°F (26 years, 1991-2020): zone 7a.
How late can frost come in Alpine?
In half of years the last 32°F night comes after May 3; in one year in ten it comes after May 26. Waiting until May 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Timpanogos Cave, UT4 miles from this station, 49.0°F a year
- Pleasant Grove, UT7 miles from this station, 54.4°F a year
- Draper, UT7 miles from this station, 54.5°F a year
- Saratoga Springs, UT10 miles from this station, 50.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made