Yellowstone Park Mammoth, WY Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Yellowstone Park Mammoth's primary NOAA station, YELLOWSTONE PARK MAMMOTH.
The climate verdict for Yellowstone Park Mammoth
Dryness leads the climate profile for Yellowstone Park Mammoth, Wyoming, with 14.8 inches of precipitation a year. NOAA records an annual average of 41°F. At 34/100 (below average) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 2% of scores.
- 41°F
- yearly average temperature, NOAA normal
- 34/100
- comfort score, above 2% of station-mapped location scores
- 14.8"
- annual precipitation · 72" snow
- 103 days
- growing season, frost-free days
Yellowstone Park Mammoth: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00489905 · Yellowstone Park Mammoth, WY 41°F mean · 14.8" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 41°F
- RANK-COOL #480
- PHOTO-FINISH ≈ Pinkham Notch
- PRCP-DRY 14.8"
- SWING-MID 44°F
- COMF-LOW 34/100
- LOAD-HEAT 8,924 HDD
- STN-1 USC00489905
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Pinkham Notch, NH (+ 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.
- Yellowstone Par… (this station) 41°F
- Hot Munising, MI 41°F
- Near Pinkham Notch, NH 41°F
- Near Newcomb, NY 41°F
- Near Highmarket, NY 41°F
Yellowstone Park Mammoth 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 · Yellowstone Park Mammoth
Yellowstone Park Mammoth: 10/100 · grade F
Yellowstone Park Mammoth publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Yellowstone Park Mammoth, not an official NOAA rating. Rankings still use Comfort Score 34/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 14.8 in · 20.2 from 35 in | 28/100 · F |
| Snowfall burden | 71.5 inches/year | 9/100 · F |
| Normal heat + freeze calendar | 213 calendar days | 8/100 · F |
| Annual temperature balance | 40.8°F · 26.7° from 67.5°F | 6/100 · F |
| Frost-free season | 103 days/year | 0/100 · F |
Yellowstone Park Mammoth · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Yellowstone Park Mammoth is a continental Köppen climate: Dfb
Coldest-month mean 21.1°F and warmest-month mean 64.6°F place this station in continental, no dry season, warm summer climates (Dfb). Class Dfb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, warm summer.
- Köppen code
- Dfb
- Group
- Continental
- Warmest month
- 64.6°F
- Coldest month
- 21.1°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 Yellowstone Park Mammoth sits across the climate record
Three NOAA fields for Yellowstone Park Mammoth's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 93%
- Among 6,861 stations, Yellowstone Park Mammoth sits in the cooler third of annual means.
- Annual precipitation
- Drier than 83%
- Yellowstone Park Mammoth's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- 51st percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Yellowstone Park Mammoth compares across U.S. station-mapped locations
Yellowstone Park Mammoth's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
34 2nd percentile score exceeds 2% 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
Yellowstone Park Mammoth's measured station temperature trend
MethodologyAcross 99 complete annual observations from 1887 to 2024, YELLOWSTONE PARK MAMMOTH changed little at a fitted rate of 0.00°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Yellowstone Park Mammoth primary station fitted change +0.00 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 31°F (0°C) | 12°F (-11°C) | 22°F (-6°C) | 0.9" | 11.5" | 30.7 | 0.0 |
| February | 34°F (1°C) | 12°F (-11°C) | 23°F (-5°C) | 0.8" | 11.5" | 27.2 | 0.0 |
| March | 42°F (5°C) | 19°F (-7°C) | 31°F (-1°C) | 1.1" | 10.9" | 28.7 | 0.0 |
| April | 50°F (10°C) | 26°F (-3°C) | 38°F (3°C) | 1.4" | 7.8" | 23.1 | 0.0 |
| May | 60°F (15°C) | 35°F (1°C) | 47°F (8°C) | 1.8" | 1.7" | 9.8 | 0.0 |
| June | 70°F (21°C) | 42°F (6°C) | 56°F (13°C) | 1.9" | 0.3" | 1.2 | 0.2 |
| July | 81°F (27°C) | 48°F (9°C) | 65°F (18°C) | 1.3" | 0.0" | 0.0 | 3.3 |
| August | 80°F (27°C) | 47°F (8°C) | 63°F (17°C) | 1.1" | 0.0" | 0.4 | 1.7 |
| September | 69°F (20°C) | 39°F (4°C) | 54°F (12°C) | 1.2" | 0.6" | 4.9 | 0.3 |
| October | 54°F (12°C) | 29°F (-2°C) | 41°F (5°C) | 1.3" | 4.7" | 19.2 | 0.0 |
| November | 39°F (4°C) | 19°F (-7°C) | 29°F (-1°C) | 1.1" | 9.9" | 26.8 | 0.0 |
| December | 30°F (-1°C) | 12°F (-11°C) | 21°F (-6°C) | 0.9" | 12.6" | 30.3 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 83°F around July 28, short of 90°F on every date, while 213 dates carry a normal low at or below freezing, the coldest 11°F near December 21.
The freezing stretch
The normal low stays at or below 32°F into May 6, then returns to freezing around October 7, covering 213 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 31, when 46% of years recorded at least a hundredth of an inch. The driest is August 20 at 27%. Summed across the calendar, that is about 127 wet dates a year.
The widest day
August 2 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 Yellowstone Park Mammoth.
Where Yellowstone Park Mammoth Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 213 nights a year, placing this among the most frost-prone tenth of ranked stations.
A drier-than-most normal water year — around 15 inches, below what four out of five ranked stations collect.
Yellowstone Park Mammoth 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: 11.5"
10.6 days with precipitation
Snow: 11.5"
11.4 days with precipitation
Snow: 10.9"
10.5 days with precipitation
Snow: 7.8"
11.3 days with precipitation
Snow: 1.7"
12.8 days with precipitation
Snow: 0.3"
12.5 days with precipitation
9.2 days with precipitation
8.5 days with precipitation
Snow: 0.6"
8.7 days with precipitation
Snow: 4.7"
9.7 days with precipitation
Snow: 9.9"
9.6 days with precipitation
Snow: 12.6"
11.9 days with precipitation
Yellowstone Park Mammoth spreads its precipitation across the year
Neither half of the year dominates here: June through August take 28% of the annual total and December through February 18%, with neither reaching the 35% that would mark a distinct wet season. Yellowstone Park Mammoth has no dry season to plan around, though it does carry a 43.5°F seasonal spread.
The gap between the wettest and driest month still matters: June averages 1.9" and February 0.8". The three wettest months together take 34% 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.
Rain reaches Yellowstone Park Mammoth in small, frequent amounts
Yellowstone Park Mammoth records about 127 days with measurable precipitation a year and 14.8" in total, which works out to roughly 0.12 inches on an average wet day. Precipitation on 35% of all days, arriving that lightly, is the damp many-grey-days pattern rather than the storm-driven one.
Places in this band read as wetter than their annual totals suggest, because what people notice is the number of overcast days, not the depth in the gauge.
- Most wet days: May, about 13 of them.
- Fewest: August, about 9.
- Average depth per wet day: 0.12 inches.
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 Yellowstone Park Mammoth
Yellowstone Park Mammoth averages 71.5 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 53 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: 71.5 inches of depth.
- Days recording measurable snow: about 53 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 48% 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 14
50% probability date
Last Spring Freeze
June 3
50% probability date
Growing Season
103 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,924
Higher = more heating needed
Cooling Degree Days
126
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside WY closest to Yellowstone Park Mammoth 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 (41°F here).
- Morrisville, VT 41°F · 0.0°F off
- Steamboat Springs, CO 41°F · 0.0°F off
- Underwood, ND 41°F · 0.0°F off
- Gordon, WI 41°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (14.8" here), excluding temperature-peer places.
- Billings, MT 14.8" · 0.0" off
- Mccamey, TX 14.8" · 0.0" off
- Great Falls, MT 14.8" · 0.0" off
- Union, OR 14.8" · 0.0" off
Snow and freeze rhythm
When cold and snow define Yellowstone Park Mammoth
heating led · dry · mid swing
Yellowstone Park Mammoth's energy balance leans toward cold weather: 8,924 annual heating degree days against 126 for cooling. Its 43.5°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 103 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. Yellowstone Park Mammoth coldest normal
December
Averaging 21°F (-6°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Yellowstone Park Mammoth typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Yellowstone Park Mammoth snow peak
December
Yellowstone Park Mammoth averages 71.5 inches of snow a year, with December the snowiest month on the normals.
Questions about Yellowstone Park Mammoth's climate
How much snow does Yellowstone Park Mammoth get? ▼
How cold does Yellowstone Park Mammoth get in winter? ▼
How much energy does heating and cooling require in Yellowstone Park Mammoth? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Yellowstone Park Mammoth's primary station: YELLOWSTONE PARK MAMMOTH (USC00489905). 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 Yellowstone Park Mammoth; 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 Yellowstone Park Mammoth 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.