Castle Valley, UT Climate: Temperature & Rain by Month
Temperature and precipitation from NOAA NCEI 1991–2020 normals →, plus PlainClimate's derived comfort score
30-year climate normals (1991-2020) from Castle Valley's primary NOAA station, CASTLE VALLEY - 2 stations mapped to the area.
The climate verdict for Castle Valley
Dryness leads the climate profile for Castle Valley, Utah, with 9.8 inches of precipitation a year. NOAA records an annual average of 56°F. Its climate comfort score of 58/100 (moderate) lands mid-pack nationally, exceeding 37% of station-mapped location scores.
- 56°F
- average temperature, NOAA 1991-2020 normal
- 58/100
- comfort score, above 37% of station-mapped location scores
- 9.8"
- annual precipitation · 15" snow
- 189 days
- frost-free days per growing season
Castle Valley: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00421241 · Castle Valley, UT 56°F mean · 9.8" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-ARID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-MULTI · BOOK-FULL
- TEMP-MILD 56°F
- RANK-UPPER #4,254
- PHOTO-FINISH ≈ Kinsley
- PRCP-ARID 9.8"
- SWING-WIDE 51°F
- COMF-MID 58/100
- LOAD-HEAT 4,908 HDD
- STN-MULTI USC00421241
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Kinsley, KS (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every UT station list.
- Castle Valley (this station) 56°F
- Hot Butler, MO 56°F
- Near Kinsley, KS 56°F
- Near Terre Haute Ind…, IN 56°F
- Cold Meade, KS 55°F
Climate Living Index · Castle Valley
Castle Valley: 38/100 · grade F
Castle Valley publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Castle Valley, not an official NOAA rating. Rankings still use Comfort Score 58/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 55.5°F · 12.0° from 67.5°F | 61/100 · C |
| Frost-free season | 189 days/year | 56/100 · C |
| Snowfall burden | 15.1 inches/year | 56/100 · C |
| Normal heat + freeze calendar | 194 calendar days | 17/100 · F |
| Precipitation balance | 9.8 in · 25.2 from 35 in | 12/100 · F |
Castle Valley · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Castle Valley's normals sit in a dry climate class: BSk
Precipitation is low relative to temperature but above true desert thresholds: cold semi-arid steppe (BSk). Class BSk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold semi-arid steppe.
- Köppen code
- BSk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 80.8°F
- Coldest month
- 30.1°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Castle Valley sits across the climate record
Three NOAA fields for Castle Valley's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 62nd percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Drier than 94%
- Castle Valley's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 83%
- Warmest-to-coldest month gap for Castle Valley is large versus 6,861 complete station-years.
How Castle Valley compares across U.S. station-mapped locations
Castle Valley's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
58 37th percentile score exceeds 37% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 41°F (5°C) | 20°F (-7°C) | 30°F (-1°C) | 0.8" | 3.6" | 28.7 | 0.0 |
| February | 49°F (9°C) | 26°F (-3°C) | 38°F (3°C) | 0.7" | 1.6" | 21.7 | 0.0 |
| March | 60°F (16°C) | 34°F (1°C) | 47°F (8°C) | 0.9" | 1.0" | 13.3 | 0.0 |
| April | 67°F (19°C) | 40°F (5°C) | 54°F (12°C) | 1.0" | 1.0" | 3.8 | 0.0 |
| May | 78°F (26°C) | 50°F (10°C) | 64°F (18°C) | 0.8" | 0.0" | 0.0 | 2.7 |
| June | 90°F (32°C) | 60°F (15°C) | 75°F (24°C) | 0.4" | 0.0" | 0.0 | 15.7 |
| July | 96°F (36°C) | 65°F (18°C) | 81°F (27°C) | 0.8" | 0.0" | 0.0 | 27.0 |
| August | 93°F (34°C) | 63°F (17°C) | 78°F (26°C) | 0.8" | 0.0" | 0.0 | 21.8 |
| September | 84°F (29°C) | 55°F (13°C) | 70°F (21°C) | 0.9" | 0.0" | 0.1 | 5.3 |
| October | 71°F (22°C) | 41°F (5°C) | 56°F (14°C) | 1.3" | 0.0" | 3.3 | 0.1 |
| November | 55°F (13°C) | 30°F (-1°C) | 43°F (6°C) | 0.7" | 2.2" | 19.8 | 0.0 |
| December | 42°F (5°C) | 21°F (-6°C) | 31°F (0°C) | 0.8" | 5.7" | 29.4 | 0.0 |
The year, day by day
Castle Valley works both ends of the calendar. Normal highs climb to 97°F by July 18 and hold at or above 90°F on 75 dates, then normal lows drop to freezing or below on 119 dates, bottoming at 18°F around January 1.
When the heat sits
Normal highs reach 90°F from June 15 through August 28, covering 75 dates. The broader mild season, normal highs of 70°F or more, runs April 27 to October 19.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
The freezing stretch
The normal low stays at or below 32°F into March 7, then returns to freezing around November 10, covering 119 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is February 20, when 18% of years recorded at least a hundredth of an inch. The driest is June 21 at 8%. Summed across the calendar, that is about 49 wet dates a year.
The widest day
July 25 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Castle Valley.
Where Castle Valley Stands Nationally
Aridity defines the water calendar: about 10 inches in a normal year lands this among the driest tenth of ranked stations.
Heat is a defining feature of the normals calendar — the normal daily high reaches 90°F on roughly 75 days a year, more than four out of five ranked stations record.
Castle Valley earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 3.6"
4.0 days with precipitation
Snow: 1.6"
5.5 days with precipitation
Snow: 1.0"
4.1 days with precipitation
Snow: 1.0"
5.1 days with precipitation
4.7 days with precipitation
2.2 days with precipitation
3.0 days with precipitation
4.1 days with precipitation
4.2 days with precipitation
4.4 days with precipitation
Snow: 2.2"
3.9 days with precipitation
Snow: 5.7"
3.9 days with precipitation
Castle Valley spreads its precipitation across the year
Neither half of the year dominates here: June through August take 20% of the annual total and December through February 23%, with neither reaching the 35% that would mark a distinct wet season. Castle Valley has no dry season to plan around, though it does carry a wide 50.7°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: October averages 1.3" and June 0.4". The three wettest months together take 33% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Castle Valley's precipitation splits across the calendar
About 49 days a year record measurable precipitation here, carrying 9.8" between them, or roughly 0.20 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Castle Valley
Castle Valley averages 15.1 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 7 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 15.1 inches of depth.
- Days recording measurable snow: about 7 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 15% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 23
50% probability date
Last Spring Freeze
April 17
50% probability date
Growing Season
189 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,908
Higher = more heating needed
Cooling Degree Days
1,457
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside UT closest to Castle Valley on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (56°F here).
- Allardt, TN 56°F · 0.0°F off
- Hayesville, NC 56°F · 0.0°F off
- Hillsboro, IL 56°F · 0.0°F off
- Hugoton, KS 56°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (9.8" here), excluding temperature-peer places.
- Hagerman, ID 9.8" · 0.0" off
- San Diego, CA 9.8" · 0.0" off
- Blanca, CO 9.8" · 0.1" off
- Jeffrey City, WY 9.9" · 0.1" off
Snow and freeze rhythm
When cold and snow define Castle Valley
heating led · dry · mid swing
Castle Valley's energy balance leans toward cold weather: 4,908 annual heating degree days against 1,457 for cooling. Its 50.7°F seasonal range still makes the monthly rows more useful than the annual average alone.
Castle Valley's frost-free season lasts about 189 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Castle Valley coldest normal
January
The monthly mean of 30°F (-1°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Castle Valley typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Castle Valley snow peak
December
Castle Valley averages 15.1 inches of snow a year, with December the snowiest month on the normals.
Questions about Castle Valley's climate
How much snow does Castle Valley get? ▼
How many days above 90°F does Castle Valley get? ▼
How much energy does heating and cooling require in Castle Valley? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Castle Valley's primary station: CASTLE VALLEY (USC00421241). 2 NOAA stations are mapped to the Castle Valley area; the primary station's record is used for consistency. For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4911000). Match rule for Castle Valley: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Castle Valley comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.