Billy Creek, WY Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Billy Creek's primary NOAA station, BILLY CREEK.
The climate verdict for Billy Creek
Dryness leads the climate profile for Billy Creek, Wyoming, with 13.4 inches of precipitation a year. NOAA records an annual average of 46°F. At 49/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 18% of scores.
- 46°F
- annual average temperature (NOAA normal)
- 49/100
- comfort score, above 18% of station-mapped location scores
- 13.4"
- annual precipitation · 36" snow
- 125 days
- growing season, frost-free days
Billy Creek: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00480740 · Billy Creek, WY 46°F mean · 13.4" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 46°F
- RANK-COOL #1,441
- PHOTO-FINISH ≈ Enosburg Falls
- PRCP-DRY 13.4"
- SWING-MID 45°F
- COMF-LOW 49/100
- LOAD-HEAT 7,516 HDD
- STN-1 USC00480740
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Enosburg Falls, VT (+ 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.
- Billy Creek (this station) 46°F
- Hot Casper Natrona…, WY 46°F
- Near Enosburg Falls, VT 46°F
- Near Helena, MT 46°F
- Cold Sheridan County, WY 45°F
Billy Creek 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 · Billy Creek
Billy Creek: 20/100 · grade F
Billy Creek publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Billy Creek, not an official NOAA rating. Rankings still use Comfort Score 49/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 35.7 inches/year | 32/100 · F |
| Precipitation balance | 13.4 in · 21.6 from 35 in | 23/100 · F |
| Annual temperature balance | 45.5°F · 22.0° from 67.5°F | 21/100 · F |
| Normal heat + freeze calendar | 196 calendar days | 16/100 · F |
| Frost-free season | 125 days/year | 9/100 · F |
Billy Creek · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Billy Creek'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
- 70.1°F
- Coldest month
- 25.3°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 Billy Creek sits across the climate record
Three NOAA fields for Billy Creek's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 79%
- Among 6,861 stations, Billy Creek sits in the cooler third of annual means.
- Annual precipitation
- Drier than 86%
- Billy Creek's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 57th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Billy Creek compares across U.S. station-mapped locations
Billy Creek's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
49 18th percentile score exceeds 18% 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 | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 39°F (4°C) | 12°F (-11°C) | 25°F (-4°C) | 0.3" | 5.0" | 30.2 | 0.0 |
| February | 40°F (4°C) | 15°F (-10°C) | 27°F (-3°C) | 0.4" | 5.2" | 26.9 | 0.0 |
| March | 49°F (9°C) | 22°F (-5°C) | 36°F (2°C) | 0.6" | 5.5" | 26.7 | 0.0 |
| April | 55°F (13°C) | 30°F (-1°C) | 43°F (6°C) | 1.5" | 6.2" | 20.4 | 0.0 |
| May | 64°F (18°C) | 39°F (4°C) | 52°F (11°C) | 2.8" | 1.1" | 7.1 | 0.1 |
| June | 76°F (24°C) | 48°F (9°C) | 62°F (17°C) | 2.1" | 0.0" | 0.7 | 2.3 |
| July | 86°F (30°C) | 55°F (13°C) | 70°F (21°C) | 1.6" | 0.0" | 0.0 | 11.4 |
| August | 84°F (29°C) | 53°F (12°C) | 68°F (20°C) | 0.8" | 0.0" | 0.0 | 10.1 |
| September | 74°F (24°C) | 43°F (6°C) | 59°F (15°C) | 1.3" | 0.2" | 4.1 | 2.4 |
| October | 60°F (15°C) | 31°F (-1°C) | 45°F (7°C) | 1.1" | 3.1" | 18.3 | 0.0 |
| November | 48°F (9°C) | 21°F (-6°C) | 34°F (1°C) | 0.5" | 4.8" | 27.2 | 0.0 |
| December | 39°F (4°C) | 12°F (-11°C) | 26°F (-4°C) | 0.3" | 4.6" | 30.5 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 87°F around July 22, short of 90°F on every date, while 196 dates carry a normal low at or below freezing, the coldest 11°F near January 1.
The freezing stretch
The normal low stays at or below 32°F into April 25, then returns to freezing around October 13, covering 196 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 27, when 40% of years recorded at least a hundredth of an inch. The driest is December 16 at 14%. Summed across the calendar, that is about 83 wet dates a year.
The widest day
September 4 carries the biggest normal gap between afternoon and dawn, 32°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Billy Creek.
Where Billy Creek Stands Nationally
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 196 nights a year, more than most ranked stations.
A drier-than-most normal water year — around 14 inches, below what four out of five ranked stations collect.
Billy Creek 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: 5.0"
5.0 days with precipitation
Snow: 5.2"
5.3 days with precipitation
Snow: 5.5"
6.2 days with precipitation
Snow: 6.2"
9.4 days with precipitation
Snow: 1.1"
11.5 days with precipitation
10.5 days with precipitation
7.5 days with precipitation
5.9 days with precipitation
Snow: 0.2"
6.2 days with precipitation
Snow: 3.1"
6.2 days with precipitation
Snow: 4.8"
4.9 days with precipitation
Snow: 4.6"
4.3 days with precipitation
Billy Creek spreads its precipitation across the year
Neither half of the year dominates here: June through August take 33% of the annual total and December through February 8%, with neither reaching the 35% that would mark a distinct wet season. Billy Creek has no dry season to plan around, though it does carry a 44.8°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 2.8" and January 0.3". The three wettest months together take 48% 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.
Billy Creek is dry, and what does fall arrives gently
Only about 83 days a year record measurable precipitation here, 23% of the calendar, and they carry 13.4" between them. At roughly 0.16 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 12 wet days; the driest is December at about 4.
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.
Winter brings real snow to Billy Creek
Billy Creek averages 35.7 inches of snowfall a year, with April the snowiest month on the normals, spread across roughly 28 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: 35.7 inches of depth.
- Days recording measurable snow: about 28 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 27% 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
September 21
50% probability date
Last Spring Freeze
May 19
50% probability date
Growing Season
125 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,516
Higher = more heating needed
Cooling Degree Days
452
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WY closest to Billy Creek 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).
- Britt, IA 46°F · 0.0°F off
- Caledonia, MN 46°F · 0.0°F off
- Charlevoix, MI 46°F · 0.0°F off
- Deer Park, WA 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (13.4" here), excluding temperature-peer places.
- Stockton, CA 13.4" · 0.0" off
- Weiser, ID 13.4" · 0.0" off
- Chinook, MT 13.4" · 0.0" off
- Glasgow, MT 13.4" · 0.0" off
Snow and freeze rhythm
When cold and snow define Billy Creek
heating led · dry · mid swing
Billy Creek's energy balance leans toward cold weather: 7,516 annual heating degree days against 452 for cooling. Its 44.8°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 125 days are frost-free in a normal year. That short interval is consistent with the cold-season signal, but the measure does not predict the exact first or last freeze in any one year.
-
1. Billy Creek coldest normal
January
Averaging 25°F (-4°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Billy Creek typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Billy Creek snow peak
April
Billy Creek averages 35.7 inches of snow a year, with April the snowiest month on the normals.
Questions about Billy Creek's climate
How much snow does Billy Creek get? ▼
How cold does Billy Creek get in winter? ▼
How much energy does heating and cooling require in Billy Creek? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Billy Creek's primary station: BILLY CREEK (USC00480740). 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 Billy Creek; 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 Billy Creek 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.