Photo: Tricia Simpson · CC BY-SA 4.0Castle Dale’s winters are colder but less snowy than most of the U.S.
A typical July afternoon reaches 90°, a January night drops to 13°, and about 11 inches of snow falls in a normal winter.
A year in Castle Dale at a glance
Each month’s typical high and low, and what it brings.
What stands out about Castle Dale’s climate
Compared with towns across the U.S., with Castle Dale’s place in Utah beside it.
What a year in Castle Dale feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 128 frost-free days a year
In half of years the last 32° night comes by May 18 and the first by September 27. Frost and day counts come from NOAA’s station at Castle Dale, UT, 1.1 miles from the town’s center, 180 ft lower.
The 2023 USDA map puts Castle Dale’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −8°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 11 inches of snow a winter
Snow, measured at Castledale Hunter Up&l, UT, falls mostly in January. Precipitation (rain plus melted snow) adds up to 8 inches a year; September is the wettest month and November the driest. Rain or snow falls on about 47 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Castle Dale
92% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Castle Dale, UT.
Living with Castle Dale’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
128 frost-free days in zone 6a. The last frost comes by May 18 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Sep 27.
Months with highs of 62–84° and lows of 40° or more: May, June and September. 0.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Castle Dale from natural hazards, river flooding is the largest share (41%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Castle Dale and similar climates
TownRatings has no climate map of the towns around Castle Dale yet.
Climates most like Castle Dale’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Castle Dale, UT | 13° | 90° | 8" | 11" |
| Zuni Pueblo, NM | 16° | 89° | 11" | 10" |
| Montrose, CO | 15° | 90° | 10" | 22" |
| Blackfoot, ID | 16° | 88° | 11" | 15" |
| Powell, WY | 11° | 87° | 7" | 11" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Castle Dale averaged 1.7° warmer than the 1900s. The biggest change is in January (+3.3°).
A bigger shift than in 72% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Castle Dale compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Castle Dale’s place among Utah’s.
Castle Dale weather by month
Highs, lows and precipitation from NOAA’s grid at Castle Dale’s center; snow, wet days and snow on the ground from Castledale Hunter Up&l, UT. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 13° | 0.6" | 5.0" | 3 | 13 | 17° – 34° |
| February | 45° | 19° | 0.7" | 2.1" | 4 | 5 | 24° – 40° |
| March | 55° | 27° | 0.6" | 0.2" | 3 | 1 | 36° – 46° |
| April | 62° | 32° | 0.5" | 0.1" | 4 | 0 | 43° – 54° |
| May | 73° | 41° | 0.7" | 0.0" | 4 | 0 | 51° – 61° |
| June | 84° | 49° | 0.5" | 0.0" | 4 | 0 | 61° – 72° |
| July | 90° | 57° | 0.7" | 0.0" | 3 | 0 | 69° – 77° |
| August | 87° | 54° | 1.0" | 0.0" | 6 | 0 | 68° – 75° |
| September | 79° | 45° | 1.1" | 0.0" | 5 | 0 | 58° – 66° |
| October | 66° | 34° | 1.1" | 0.1" | 5 | 0 | 44° – 55° |
| November | 51° | 23° | 0.4" | 1.1" | 3 | 1 | 31° – 42° |
| December | 38° | 14° | 0.5" | 2.4" | 2 | 4 | 18° – 32° |
| Year | 64° | 34° | 8.4" | 11.0" | 47 | 23 |
How much a month can swing
A normal is an average. January swings the most: from 1991 to 2020 its average ranged from 17° to 34°. August is the most reliable, staying within 7°.
Where Castle Dale’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Castle Dale’s center.
- Snow: Castledale Hunter Up&l, UT.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Castle Dale, UT, 1.1 miles from the town’s center, 180 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Castle Dale’s climate
What is the weather like in Castle Dale?
A typical July afternoon reaches 90°, a January night drops to 13°, and about 11 inches of snow falls in a normal winter. Colder January nights than 90% of U.S. towns; hotter July afternoons than 78% of U.S. towns.
How cold does it get in Castle Dale in winter?
January nights average 13°. About 186 nights a year reach 32° or below and 11 reach 0° or below. In the coldest January of the last 30 years the month averaged 17°.
How much snow does Castle Dale get?
About 11 inches in a normal winter at Castledale Hunter Up&l, UT, most of it in January, with snow on the ground about 23 days a year.
How hot does it get in Castle Dale?
July, with a typical high of 90° and a low of 57°. About 44 days a year reach 90° and 2 reach 100° (Castle Dale, UT).
When is the first and last frost in Castle Dale?
In half of years the last spring frost (32°) comes by May 18 and the first fall frost by September 27, about 128 frost-free days, at Castle Dale, UT.
What growing zone is Castle Dale in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −8°.
What is the best time of year to visit Castle Dale?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Castle Dale getting warmer?
Yes: 1991–2020 averaged 1.7° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 72% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Castle Dale.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.