Castle Dale, Utah climate: Normal weather by month, frost dates and records
Castle Dale's normal year runs from 10°F January nights to 91°F July afternoons, with 8.0 inches of precipitation and 17 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.4°C, January lows of −12°C, July highs of 33°C, 203 mm of precipitation a year.
- NOAA stationCastle Dale
- Station IDUSC00421214
- Location39.21°N 111.01°W
- Elevation5,629 ft (1,716 m)
- Population1,537
On October 23, the normal high in Castle Dale is 65°F and the normal low 29°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Castle Dale.
- Jan 40° 10°
- Feb 47° 16°
- Mar 58° 25°
- Apr 66° 31°
- May 75° 40°
- Jun 85° 47°
- Jul 91° 54°
- Aug 89° 52°
- Sep 81° 43°
- Oct 68° 32°
- Nov 53° 20°
- Dec 41° 11°
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 Castle Dale each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 10°F. The most precipitation falls in September (1.03 in), the least in June (0.45 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 40°F | 10°F | 25.1°F | 0.63 | 5.5 | 5 | <1 | 31 | 9 h 40 min |
| February | 47°F | 16°F | 31.5°F | 0.64 | 3.3 | 5 | <1 | 27 | 10 h 40 min |
| March | 58°F | 25°F | 41.5°F | 0.59 | 1.4 | 4 | <1 | 27 | 11 h 50 min |
| April | 66°F | 31°F | 48.2°F | 0.54 | 0.2 | 4 | <1 | 18 | 13 h 10 min |
| May | 75°F | 40°F | 57.0°F | 0.72 | 0.0 | 5 | 1 | 5 | 14 h 20 min |
| June | 85°F | 47°F | 66.1°F | 0.45 | 0.0 | 3 | 9 | <1 | 14 h 50 min |
| July | 91°F | 54°F | 72.7°F | 0.59 | 0.0 | 5 | 19 | <1 | 14 h 40 min |
| August | 89°F | 52°F | 70.4°F | 0.92 | 0.0 | 7 | 13 | <1 | 13 h 50 min |
| September | 81°F | 43°F | 62.0°F | 1.03 | 0.0 | 6 | 3 | 2 | 12 h 30 min |
| October | 68°F | 32°F | 49.9°F | 0.97 | 0.1 | 5 | <1 | 17 | 11 h 10 min |
| November | 53°F | 20°F | 36.5°F | 0.46 | 1.2 | 3 | <1 | 28 | 10 h |
| December | 41°F | 11°F | 26.1°F | 0.47 | 4.9 | 5 | <1 | 31 | 9 h 30 min |
| Year (annual) | 66°F | 32°F | 48.9°F | 8.01 | 16.6 | 57 | 44 | 186 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −12°C | −3.8°C | 16 mm | 14 cm |
| February | 8°C | −9°C | −0.3°C | 16 mm | 8 cm |
| March | 15°C | −4°C | 5.3°C | 15 mm | 4 cm |
| April | 19°C | −1°C | 9.0°C | 14 mm | 1 cm |
| May | 24°C | 4°C | 13.9°C | 18 mm | 0 cm |
| June | 30°C | 8°C | 18.9°C | 11 mm | 0 cm |
| July | 33°C | 12°C | 22.6°C | 15 mm | 0 cm |
| August | 31°C | 11°C | 21.3°C | 23 mm | 0 cm |
| September | 27°C | 6°C | 16.7°C | 26 mm | 0 cm |
| October | 20°C | 0°C | 9.9°C | 25 mm | 0 cm |
| November | 12°C | −7°C | 2.5°C | 12 mm | 3 cm |
| December | 5°C | −12°C | −3.3°C | 12 mm | 12 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00421214; 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 Castle Dale?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, April has the fewest days with rain (4).
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 USC00421214.
When is the last frost in Castle Dale?
In Castle Dale, the last spring frost (32°F) comes after May 18 in half of years and after June 8 in one year in ten; the first autumn frost comes before September 27 in half of years and before September 14 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 181 year in 10 after June 8; 9 in 10 after May 4
- First autumn frost, half of years before
- September 271 year in 10 before September 14; 9 in 10 before October 9
NOAA puts the median frost-free season at 128 days, and the season without a hard freeze (28°F) at 153 days.
A hard freeze (28°F) comes after May 4 in half of springs and before October 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Castle Dale in zone 6a in ZIP code 84513. By the map's own method, the average of each year's coldest night over 1991-2020, Castle Dale's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (29 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 USC00421214; 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 Castle Dale?
In a normal year in Castle Dale, 44 days a year reach 90°F (2 of them 100°F or more), 186 nights fall to 32°F or colder and 57 days bring measurable precipitation.
- Days at 90°F or more
- 44a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 186a normal year
- Days that stay below freezing
- 14high of 32°F or less
- Days with 0.01 inch of precipitation
- 57a normal year
- Days with 1 inch of snow or more
- 7a normal year
The highest temperature in this station's record (since 1899) is 107°F, on July 13, 2002; the lowest is −35°F, on February 10, 1933.
The wettest calendar year on that record is 1965, with 14.28 in; the snowiest season is 1936–37, with 47.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00421214; records: ACIS (NOAA Regional Climate Centers), station USC00421214. Records use complete months only; a month missing more than three days is left out.
How sunny is Castle Dale?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Castle Dale, 5.0 kWh per square metre a day. June is the sunniest month (87%) and December the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.5 |
| February | 75% | 3.4 |
| March | 76% | 4.7 |
| April | 74% | 5.7 |
| May | 78% | 6.8 |
| June | 87% | 7.9 |
| July | 84% | 7.2 |
| August | 84% | 6.5 |
| September | 86% | 5.5 |
| October | 82% | 4.0 |
| November | 77% | 2.7 |
| December | 72% | 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 Castle Dale need?
A normal year in Castle Dale brings 6,378 heating degree days, 19% more than the median U.S. place (5,373), and 547 cooling degree days, 40% 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 2,574 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,238 | 0 |
| February | 938 | 0 |
| March | 727 | 0 |
| April | 503 | 0 |
| May | 257 | 10 |
| June | 58 | 93 |
| July | 3 | 243 |
| August | 6 | 174 |
| September | 119 | 27 |
| October | 468 | 0 |
| November | 855 | 0 |
| December | 1,206 | 0 |
| Year (annual) | 6,378 | 547 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00421214. 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 Castle Dale been warmer than normal lately?
2025 averaged 51.3°F, 2.4°F above the 1991-2020 normal of 48.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 50.0°F | +1.1°F | 7.34 | 18.0 |
| 2022 | 49.0°F | +0.1°F | 4.71 | 18.0 |
| 2023 | 47.5°F | −1.4°F | 8.39 | 37.1 |
| 2024 | 50.1°F | +1.2°F | 9.36 | 19.0 |
| 2025 | 51.3°F | +2.4°F | 6.14 | 5.0 |
Over 76 complete years from 1903 to 2025, the station's annual mean temperature rose at a fitted 1.3°F per century (+0.07°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00421214; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Castle Dale's climate compare?
Castle Dale is warmer than 43 of the other 96 places with their own NOAA record in Utah, and wetter than 9. Across the 7,247 U.S. stations with normals, its annual mean of 48.9°F is warmer than 36%.
In the Köppen classification computed from these normals, Castle Dale 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 Castle Dale 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.
- Huntington, UT1,984 people · 9 mi N
- Orangeville, UT1,269 people · 3 mi NW
- Cleveland, UT516 people · 13 mi NE
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 Castle Dale's climate
What is the coldest month in Castle Dale?
January, with a normal high of 40°F and a normal low of 10°F. The warmest is July (91°F by day, 54°F at night).
Does it snow in Castle Dale?
Yes: 17 inches in a normal year, falling on 8 days with 0.1 inch or more, the most in January (5.5 inches).
What is the rainiest month in Castle Dale?
September, with 1.03 in of precipitation in a normal year; the driest is June with 0.45 in.
What plant hardiness zone is Castle Dale in?
The USDA's 2023 map puts Castle Dale in zone 6a in ZIP code 84513. By the same method at Castle Dale's NOAA station, the coldest night of a typical year reaches −9°F (29 years, 1991-2020): zone 6a.
How late can frost come in Castle Dale?
In half of years the last 32°F night comes after May 18; in one year in ten it comes after June 8. Waiting until June 8 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Utah climateThe statewide normals and every place in the state
- Ferron, UT11 miles from this station, 49.7°F a year
- Wellington, UT29 miles from this station, 47.0°F a year
- Electric Lake, UT29 miles from this station, 34.3°F a year
- Salina (24 mi E), UT30 miles from this station, 43.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made