Heart Mtn, 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 Heart Mtn's primary NOAA station, HEART MTN.
The climate verdict for Heart Mtn
Dryness leads the climate profile for Heart Mtn, Wyoming, with 9.3 inches of precipitation a year. NOAA records an annual average of 46°F. At 39/100 (below average) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 4% of scores.
- 46°F
- yearly average temperature, NOAA normal
- 39/100
- comfort score, above 4% of station-mapped location scores
- 9.3"
- annual precipitation · 44" snow
- 133 days
- frost-free days per growing season
Heart Mtn: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00484411 · Heart Mtn, WY 46°F mean · 9.3" 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 #1,441
- PHOTO-FINISH ≈ White Lake
- PRCP-ARID 9.3"
- SWING-WIDE 46°F
- COMF-LOW 39/100
- LOAD-HEAT 7,405 HDD
- STN-1 USC00484411
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: White Lake, MI (+ 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.
- Heart Mtn (this station) 46°F
- Cold Sanford, ME 46°F
- Hot Downey, ID 46°F
- Near White Lake, MI 46°F
- Near Salisbury, NH 46°F
Heart Mtn 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 · Heart Mtn
Heart Mtn: 19/100 · grade F
Heart Mtn publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Heart Mtn, not an official NOAA rating. Rankings still use Comfort Score 39/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 44.2 inches/year | 24/100 · F |
| Normal heat + freeze calendar | 184 calendar days | 23/100 · F |
| Annual temperature balance | 45.6°F · 21.9° from 67.5°F | 22/100 · F |
| Frost-free season | 133 days/year | 14/100 · F |
| Precipitation balance | 9.3 in · 25.7 from 35 in | 10/100 · F |
Heart Mtn · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Heart Mtn'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
- 69.5°F
- Coldest month
- 23.3°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 Heart Mtn sits across the climate record
Three NOAA fields for Heart Mtn'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, Heart Mtn sits in the cooler third of annual means.
- Annual precipitation
- Drier than 95%
- Heart Mtn's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 65th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Heart Mtn compares across U.S. station-mapped locations
Heart Mtn's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
39 4th percentile score exceeds 4% 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%). This entry sits in this band.
- 40–50: 1,113 station-mapped locations (18%). Above this entry.
- 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 | 34°F (1°C) | 13°F (-11°C) | 23°F (-5°C) | 0.3" | 7.7" | 29.7 | 0.0 |
| February | 38°F (3°C) | 15°F (-10°C) | 26°F (-3°C) | 0.4" | 5.8" | 26.6 | 0.0 |
| March | 50°F (10°C) | 24°F (-4°C) | 37°F (3°C) | 0.6" | 7.8" | 25.9 | 0.0 |
| April | 59°F (15°C) | 31°F (0°C) | 45°F (7°C) | 0.8" | 4.5" | 16.7 | 0.0 |
| May | 68°F (20°C) | 41°F (5°C) | 54°F (12°C) | 1.8" | 0.2" | 4.2 | 0.1 |
| June | 77°F (25°C) | 48°F (9°C) | 62°F (17°C) | 1.5" | 0.0" | 0.4 | 1.4 |
| July | 85°F (29°C) | 54°F (12°C) | 70°F (21°C) | 0.9" | 0.0" | 0.0 | 7.9 |
| August | 83°F (28°C) | 53°F (11°C) | 68°F (20°C) | 0.5" | 0.0" | 0.1 | 4.1 |
| September | 73°F (23°C) | 44°F (7°C) | 59°F (15°C) | 0.9" | 0.7" | 2.5 | 0.2 |
| October | 59°F (15°C) | 33°F (1°C) | 46°F (8°C) | 0.9" | 5.7" | 12.0 | 0.0 |
| November | 45°F (7°C) | 22°F (-6°C) | 33°F (1°C) | 0.3" | 5.7" | 25.3 | 0.0 |
| December | 34°F (1°C) | 14°F (-10°C) | 24°F (-5°C) | 0.3" | 6.1" | 29.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 86°F around July 21, short of 90°F on every date, while 184 dates carry a normal low at or below freezing, the coldest 12°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into April 20, then returns to freezing around October 20, covering 184 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 25, when 34% of years recorded at least a hundredth of an inch. The driest is December 17 at 10%. Summed across the calendar, that is about 70 wet dates a year.
The widest day
July 3 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 Heart Mtn.
Where Heart Mtn Stands Nationally
Aridity defines the water calendar: about 9 inches in a normal year lands this among the driest tenth of ranked stations.
Freezing is routine here by normals standards — the normal low reaches 32°F or colder on about 184 nights a year, more than most ranked stations.
Heart Mtn 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: 7.7"
3.7 days with precipitation
Snow: 5.8"
3.7 days with precipitation
Snow: 7.8"
5.3 days with precipitation
Snow: 4.5"
5.1 days with precipitation
Snow: 0.2"
10.1 days with precipitation
8.8 days with precipitation
7.5 days with precipitation
7.0 days with precipitation
Snow: 0.7"
6.6 days with precipitation
Snow: 5.7"
5.0 days with precipitation
Snow: 5.7"
3.9 days with precipitation
Snow: 6.1"
3.2 days with precipitation
Heart Mtn spreads its precipitation across the year
Neither half of the year dominates here: June through August take 32% of the annual total and December through February 11%, with neither reaching the 35% that would mark a distinct wet season. Heart Mtn has no dry season to plan around, though it does carry a wide 46.2°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: May averages 1.8" and January 0.3". The three wettest months together take 46% 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.
Heart Mtn is dry, and what does fall arrives gently
Only about 70 days a year record measurable precipitation here, 19% of the calendar, and they carry 9.3" between them. At roughly 0.13 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 10 wet days; the driest is December at about 3.
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 Heart Mtn
Heart Mtn averages 44.2 inches of snowfall a year, with March the snowiest month on the normals, spread across roughly 20 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: 44.2 inches of depth.
- Days recording measurable snow: about 20 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 47% 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 25
50% probability date
Last Spring Freeze
May 15
50% probability date
Growing Season
133 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
7,405
Higher = more heating needed
Cooling Degree Days
354
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside WY closest to Heart Mtn 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).
- Appleton, WI 46°F · 0.0°F off
- Cobleskill, NY 46°F · 0.0°F off
- Downey, ID 46°F · 0.0°F off
- La Crosse, WI 46°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (9.3" here), excluding temperature-peer places.
- St George, UT 9.3" · 0.0" off
- Terlingua, TX 9.3" · 0.0" off
- Arlington, OR 9.3" · 0.0" off
- Minden, NV 9.3" · 0.0" off
Snow and freeze rhythm
When cold and snow define Heart Mtn
heating led · dry · mid swing
Heart Mtn's energy balance leans toward cold weather: 7,405 annual heating degree days against 354 for cooling. Its 46.2°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 133 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. Heart Mtn coldest normal
January
Averaging 23°F (-5°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Heart Mtn typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Heart Mtn snow peak
March
Heart Mtn averages 44.2 inches of snow a year, with March the snowiest month on the normals.
Questions about Heart Mtn's climate
How much snow does Heart Mtn get? ▼
How cold does Heart Mtn get in winter? ▼
How much energy does heating and cooling require in Heart Mtn? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Heart Mtn's primary station: HEART MTN (USC00484411). 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 Heart Mtn; 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 Heart Mtn 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.