Opheim, MT 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 Opheim's primary NOAA station, OPHEIM 10 N - 2 stations mapped to the area.
The climate verdict for Opheim
Dryness leads the climate profile for Opheim, Montana, with 14.4 inches of precipitation a year. NOAA records an annual average of 39°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.
- 39°F
- average temperature, NOAA 1991-2020 normal
- 39/100
- comfort score, above 4% of station-mapped location scores
- 14.4"
- annual precipitation · 33" snow
- 98 days
- frost-free days per growing season
Opheim: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00246236 · Opheim, MT 39°F mean · 14.4" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-MULTI · BOOK-FULL
- TEMP-COLD 39°F
- RANK-COOL #274
- PHOTO-FINISH ≈ Champion Van Ri…
- PRCP-DRY 14.4"
- SWING-WIDE 55°F
- COMF-LOW 39/100
- LOAD-HEAT 9,603 HDD
- STN-MULTI USC00246236
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Champion Van Riper Park, MI ( -0.1 °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 MT station list.
- Opheim (this station) 39°F
- Cold Wolf Ridge Elc, MN 39°F
- Hot Velva, ND 39°F
- Near Champion Van Ri…, MI 39°F
- Near Devils Lake, ND 39°F
Opheim sits in Montana, the #6 coldest U.S. state at 43.4°F statewide annual average - see all 50 coldest states ranked by NOAA normals
Climate Living Index · Opheim
Opheim: 11/100 · grade F
Opheim publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Opheim, not an official NOAA rating. Rankings still use Comfort Score 39/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 33.0 inches/year | 35/100 · F |
| Precipitation balance | 14.4 in · 20.6 from 35 in | 26/100 · F |
| Normal heat + freeze calendar | 214 calendar days | 7/100 · F |
| Annual temperature balance | 39.1°F · 28.4° from 67.5°F | 2/100 · F |
| Frost-free season | 98 days/year | 0/100 · F |
Opheim · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Opheim is a continental Köppen climate: Dwb
Coldest-month mean 11.2°F and warmest-month mean 65.7°F place this station in continental, dry-winter, warm summer climates (Dwb). Class Dwb is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, dry-winter, warm summer.
- Köppen code
- Dwb
- Group
- Continental
- Warmest month
- 65.7°F
- Coldest month
- 11.2°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 Opheim sits across the climate record
Three NOAA fields for Opheim's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 96%
- Among 6,861 stations, Opheim sits in the cooler third of annual means.
- Annual precipitation
- Drier than 84%
- Opheim's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 91%
- Warmest-to-coldest month gap for Opheim is large versus 6,861 complete station-years.
How Opheim compares across U.S. station-mapped locations
Opheim'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
Opheim's measured station temperature trend
MethodologyAcross 31 complete annual observations from 1960 to 2024, OPHEIM 10 N warmed at a fitted rate of 0.42°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Opheim primary station fitted change +0.42 °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 | 22°F (-6°C) | 1°F (-17°C) | 11°F (-12°C) | 0.3" | 4.5" | 30.6 | 0.0 |
| February | 26°F (-4°C) | 4°F (-16°C) | 15°F (-10°C) | 0.4" | 6.2" | 27.5 | 0.0 |
| March | 38°F (3°C) | 15°F (-9°C) | 27°F (-3°C) | 0.4" | 5.1" | 29.4 | 0.0 |
| April | 54°F (12°C) | 26°F (-3°C) | 40°F (4°C) | 0.9" | 2.5" | 23.3 | 0.0 |
| May | 65°F (19°C) | 36°F (2°C) | 51°F (10°C) | 2.1" | 0.9" | 10.8 | 0.0 |
| June | 73°F (23°C) | 46°F (8°C) | 59°F (15°C) | 3.7" | 0.0" | 0.9 | 0.7 |
| July | 81°F (27°C) | 50°F (10°C) | 66°F (19°C) | 2.3" | 0.0" | 0.0 | 4.4 |
| August | 81°F (27°C) | 49°F (9°C) | 65°F (18°C) | 1.6" | 0.0" | 0.5 | 6.1 |
| September | 70°F (21°C) | 39°F (4°C) | 55°F (13°C) | 1.4" | 0.2" | 6.9 | 1.2 |
| October | 54°F (12°C) | 28°F (-2°C) | 41°F (5°C) | 0.8" | 1.2" | 21.5 | 0.0 |
| November | 37°F (3°C) | 15°F (-9°C) | 26°F (-3°C) | 0.4" | 5.3" | 28.0 | 0.0 |
| December | 25°F (-4°C) | 4°F (-15°C) | 14°F (-10°C) | 0.3" | 7.1" | 30.6 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 84°F around July 30, short of 90°F on every date, while 214 dates carry a normal low at or below freezing, the coldest 1°F near January 6.
The freezing stretch
The normal low stays at or below 32°F into May 5, then returns to freezing around October 5, covering 214 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 June 14, when 34% of years recorded at least a hundredth of an inch. The driest is December 6 at 9%. Summed across the calendar, that is about 62 wet dates a year.
The widest day
August 12 carries the biggest normal gap between afternoon and dawn, 33°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Opheim.
Where Opheim Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 214 nights a year, placing this among the most frost-prone tenth of ranked stations.
A drier-than-most normal water year — around 14 inches, below what four out of five ranked stations collect.
Opheim 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: 4.5"
2.9 days with precipitation
Snow: 6.2"
3.4 days with precipitation
Snow: 5.1"
3.2 days with precipitation
Snow: 2.5"
5.2 days with precipitation
Snow: 0.9"
7.3 days with precipitation
10.5 days with precipitation
7.3 days with precipitation
5.7 days with precipitation
Snow: 0.2"
5.6 days with precipitation
Snow: 1.2"
4.1 days with precipitation
Snow: 5.3"
3.1 days with precipitation
Snow: 7.1"
2.8 days with precipitation
Opheim runs a summer-peaked wet season
52% of Opheim's yearly precipitation falls in June, July and August alone, against the 25% an evenly spread year would give those three months. The wettest month is June at 3.7", on a wide 54.5°F gap between its warmest and coldest month. Warm-season convection and, across the Southwest, the North American monsoon produce this shape: rain arrives in short heavy bursts during the hottest part of the year rather than as long cool-season soaking.
- Wettest three months: June, July, May, taking 56% of the annual total between them.
- Driest month: December at 0.3".
- Winter share: 6% falls in December, January and February.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. A summer-peaked label means the June-August share reaches 35%; it describes timing across an average year, not any single season, and says nothing about how heavy an individual storm can be.
How Opheim's precipitation splits across the calendar
About 61 days a year record measurable precipitation here, carrying 14.4" between them, or roughly 0.24 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 Opheim
Opheim averages 33.0 inches of snowfall a year, with December the snowiest month on the normals, spread across roughly 15 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: 33.0 inches of depth.
- Days recording measurable snow: about 15 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 23% 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 7
50% probability date
Last Spring Freeze
June 1
50% probability date
Growing Season
98 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
9,603
Higher = more heating needed
Cooling Degree Days
211
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside MT closest to Opheim 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 (39°F here).
- Alta, UT 39°F · 0.0°F off
- Divide, CO 39°F · 0.0°F off
- Esmond, ND 39°F · 0.0°F off
- Hallock, MN 39°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (14.4" here), excluding temperature-peer places.
- Lakeview, OR 14.4" · 0.0" off
- Denver, CO 14.5" · 0.1" off
- Newark, CA 14.4" · 0.1" off
- Randolph, UT 14.4" · 0.1" off
Snow and freeze rhythm
When cold and snow define Opheim
heating led · dry · mid swing
Opheim's energy balance leans toward cold weather: 9,603 annual heating degree days against 211 for cooling. Its 54.5°F seasonal range still makes the monthly rows more useful than the annual average alone.
Only about 98 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. Opheim coldest normal
January
Averaging 11°F (-12°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Opheim typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Opheim snow peak
December
Opheim averages 33.0 inches of snow a year, with December the snowiest month on the normals.
Questions about Opheim's climate
How much snow does Opheim get? ▼
How cold does Opheim get in winter? ▼
How much energy does heating and cooling require in Opheim? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Opheim's primary station: OPHEIM 10 N (USC00246236). 2 NOAA stations are mapped to the Opheim 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 3055525). Match rule for Opheim: 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 Opheim 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.