Greybull S Big Horn, WY Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Greybull S Big Horn's primary NOAA station, GREYBULL S BIG HORN AP.
The climate verdict for Greybull S Big Horn
Winter sets the terms in Greybull S Big Horn, Wyoming. A pronounced 57.4°F seasonal swing and heating demand above twice the cooling total frame an annual average of 46°F. At 40/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 6% of scores.
- 46°F
- yearly average temperature, NOAA normal
- 40/100
- comfort score, above 6% of station-mapped location scores
- 5.5"
- yearly precipitation total
- 150 days
- growing season, frost-free days
Greybull S Big Horn: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00024048 · Greybull S Big Horn, WY 46°F mean · 5.5" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-ARID · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,647
- PHOTO-FINISH ≈ Mission Ridge
- PRCP-ARID 5.5"
- SWING-WIDE 57°F
- COMF-LOW 40/100
- LOAD-HEAT 7,546 HDD
- STN-1 USW00024048
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Mission Ridge, SD (+ 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 WY station list.
- Greybull S Big… (this station) 46°F
- Cold Miles City F Wi…, MT 46°F
- Hot Mission Ridge, SD 46°F
- Near White Lake, SD 46°F
- Near Spencer, IA 46°F
Greybull S Big Horn sits in Wyoming, the #5 coldest U.S. state at 43.3°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Greybull S Big Horn
Greybull S Big Horn: 15/100 · grade F
Greybull S Big Horn publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Greybull S Big Horn, not an official NOAA rating. Rankings still use Comfort Score 40/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 150 days/year | 25/100 · F |
| Annual temperature balance | 46.2°F · 21.3° from 67.5°F | 24/100 · F |
| Normal heat + freeze calendar | 211 calendar days | 9/100 · F |
| Precipitation balance | 5.5 in · 29.4 from 35 in | 2/100 · F |
Greybull S Big Horn · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Greybull S Big Horn's normals sit in a dry climate class: BWk
Annual precipitation falls well below the aridity threshold for this temperature regime, so the normals classify as cold desert (BWk). Class BWk is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically cold desert.
- Köppen code
- BWk
- Group
- Dry (arid or semi-arid)
- Warmest month
- 74.9°F
- Coldest month
- 17.5°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 Greybull S Big Horn sits across the climate record
Three NOAA fields for Greybull S Big Horn's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 76%
- Among 6,861 stations, Greybull S Big Horn sits in the cooler third of annual means.
- Annual precipitation
- Drier than 99%
- Greybull S Big Horn's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 95%
- Warmest-to-coldest month gap for Greybull S Big Horn is large versus 6,861 complete station-years.
How Greybull S Big Horn compares across U.S. station-mapped locations
Greybull S Big Horn's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
40 6th percentile score exceeds 6% 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%). This entry sits in this band.
- 50–60: 1,329 station-mapped locations (21%). Above this entry.
- 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 | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 29°F (-2°C) | 6°F (-14°C) | 18°F (-8°C) | 0.1" | 31.0 | 0.0 |
| February | 36°F (2°C) | 12°F (-11°C) | 24°F (-5°C) | 0.1" | 27.7 | 0.0 |
| March | 51°F (11°C) | 25°F (-4°C) | 38°F (3°C) | 0.2" | 26.1 | 0.0 |
| April | 60°F (16°C) | 33°F (1°C) | 47°F (8°C) | 0.5" | 13.4 | 0.0 |
| May | 70°F (21°C) | 44°F (6°C) | 57°F (14°C) | 1.3" | 2.4 | 1.0 |
| June | 81°F (27°C) | 53°F (11°C) | 67°F (19°C) | 1.1" | 0.0 | 7.3 |
| July | 91°F (33°C) | 58°F (15°C) | 75°F (24°C) | 0.2" | 0.0 | 23.1 |
| August | 89°F (32°C) | 56°F (13°C) | 72°F (22°C) | 0.2" | 0.0 | 17.7 |
| September | 77°F (25°C) | 45°F (7°C) | 61°F (16°C) | 0.8" | 1.2 | 4.1 |
| October | 60°F (16°C) | 33°F (1°C) | 47°F (8°C) | 0.6" | 15.6 | 0.0 |
| November | 44°F (6°C) | 19°F (-7°C) | 31°F (0°C) | 0.2" | 28.1 | 0.0 |
| December | 31°F (-1°C) | 8°F (-13°C) | 19°F (-7°C) | 0.1" | 31.0 | 0.0 |
The year, day by day
Greybull S Big Horn works both ends of the calendar. Normal highs climb to 93°F by July 22 and hold at or above 90°F on 36 dates, then normal lows drop to freezing or below on 175 dates, bottoming at 6°F around January 4.
When the heat sits
Normal highs reach 90°F from July 8 through August 12, covering 36 dates. The broader mild season, normal highs of 70°F or more, runs May 15 to September 27.
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 April 10, then returns to freezing around October 19, covering 175 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 May 24, when 30% of years recorded at least a hundredth of an inch. The driest is December 13 at 7%. Summed across the calendar, that is about 54 wet dates a year.
The widest day
July 16 carries the biggest normal gap between afternoon and dawn, 34°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Greybull S Big Horn.
Where Greybull S Big Horn Stands Nationally
Aridity defines the water calendar: about 6 inches in a normal year lands this among the driest tenth of ranked stations.
Daily temperature swings run wider than most of the country, peaking near 34°F between the normal high and low.
Greybull S Big Horn earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
2.6 days with precipitation
3.0 days with precipitation
3.2 days with precipitation
6.0 days with precipitation
8.8 days with precipitation
7.1 days with precipitation
3.8 days with precipitation
4.0 days with precipitation
4.5 days with precipitation
5.5 days with precipitation
3.3 days with precipitation
2.4 days with precipitation
Greybull S Big Horn spreads its precipitation across the year
Neither half of the year dominates here: June through August take 26% of the annual total and December through February 7%, with neither reaching the 35% that would mark a distinct wet season. Greybull S Big Horn has no dry season to plan around, though it does carry a wide 57.4°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 1.3" and December 0.1". The three wettest months together take 58% 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.
Greybull S Big Horn is dry, and what does fall arrives gently
Only about 54 days a year record measurable precipitation here, 15% of the calendar, and they carry 5.6" between them. At roughly 0.10 inches on an average wet day, this is not the damp drizzle of a marine climate; it is an arid record in which precipitation is both uncommon and light when it appears.
The wettest month by count is May at about 9 wet days; the driest is December at about 2.
A low per-event average in a dry record is a statement about typical days only. Arid regions can still take a large share of a year's total from a single convective storm, which a normal cannot show.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, not the extremes within it.
Frost Dates & Growing Season
First Fall Freeze
October 1
50% probability date
Last Spring Freeze
May 4
50% probability date
Growing Season
150 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,546
Higher = more heating needed
Cooling Degree Days
743
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WY closest to Greybull S Big Horn 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 (46°F here).
- Cashton, WI 46°F · 0.0°F off
- Clarence, PA 46°F · 0.0°F off
- Eureka, NV 46°F · 0.0°F off
- Fremont, MI 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (5.5" here), excluding temperature-peer places.
- Mina, NV 5.6" · 0.0" off
- Victorville, CA 5.6" · 0.0" off
- Bouse, AZ 5.7" · 0.1" off
- Independence, CA 5.4" · 0.1" off
Scarce-water calendar
Where Greybull S Big Horn's limited precipitation lands
heating led · dry · high swing
Winter and seasonal range jointly define this record. Greybull S Big Horn logs 7,546 heating degree days, more than twice its 743 cooling total, while the typical coldest-to-warmest-month gap reaches 57.4°F. The annual mean therefore compresses two materially different seasons.
Greybull S Big Horn's frost-free season lasts about 150 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
July and January mark the typical warm and cold ends of the calendar in this dry, high-range record. The gap is 57.4°F, so a single annual figure is especially lossy; the annual average is 46°f. Compare monthly temperature and precipitation together before drawing a seasonal conclusion about Greybull S Big Horn.
Greybull S Big Horn's cold-season load does not imply a wet climate. Annual precipitation is 5.5 inches, which places the station in PlainClimate's dry range. Snowfall is not added to the interpretation because its annual value is missing. The snowfall and rainfall fields should be read separately rather than inferred from temperature.
Greybull S Big Horn wettest normal
May
May concentrates the scarce annual total (5.5 inches).
Greybull S Big Horn driest normal
December
December is typically driest; arid stations are defined by when water is absent, not by a four-season grid.
Questions about Greybull S Big Horn's climate
How dry is Greybull S Big Horn? ▼
How many days above 90°F does Greybull S Big Horn get? ▼
How much energy does heating and cooling require in Greybull S Big Horn? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Greybull S Big Horn's primary station: GREYBULL S BIG HORN AP (USW00024048). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Greybull S Big Horn; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Greybull S Big Horn 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.