Lennep, MT Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Lennep's primary NOAA station, LENNEP 5 SW.
The climate verdict for Lennep
Dryness leads the climate profile for Lennep, Montana, with 18.5 inches of precipitation a year. NOAA records an annual average of 39°F. At 35/100 (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
- yearly average temperature, NOAA normal
- 35/100
- comfort score, above 4% of station-mapped location scores
- 18.5"
- annual precipitation · 96" snow
Lennep: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00244954 · Lennep, MT 39°F mean · 18.5" precip
TEMP-COLD · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-MID · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COLD 39°F
- RANK-COOL #274
- PHOTO-FINISH ≈ Sunshine
- PRCP-DRY 18.5"
- SWING-MID 39°F
- COMF-LOW 35/100
- LOAD-HEAT 9,598 HDD
- STN-1 USC00244954
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Sunshine, WY (+ 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 MT station list.
- Lennep (this station) 39°F
- Cold Bedford, WY 39°F
- Hot Scofield-skylin…, UT 39°F
- Near Sunshine, WY 39°F
- Near Green Mt Dam, CO 39°F
Lennep 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 · Lennep
Lennep: 9/100 · grade F
Lennep publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Lennep, not an official NOAA rating. Rankings still use Comfort Score 35/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 18.5 in · 16.5 from 35 in | 42/100 · D |
| Annual temperature balance | 38.7°F · 28.8° from 67.5°F | 1/100 · F |
| Normal heat + freeze calendar | 231 calendar days | 1/100 · F |
| Snowfall burden | 95.6 inches/year | 0/100 · F |
Lennep · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Lennep is a continental Köppen climate: Dfb
Coldest-month mean 21.4°F and warmest-month mean 60.1°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
- 60.1°F
- Coldest month
- 21.4°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 Lennep sits across the climate record
Three NOAA fields for Lennep'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, Lennep sits in the cooler third of annual means.
- Annual precipitation
- Drier than 75%
- Lennep's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 70%
- Warmest-to-coldest month gap for Lennep is compact versus 6,861 complete station-years.
How Lennep compares across U.S. station-mapped locations
Lennep's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
35 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
Lennep's measured station temperature trend
MethodologyAcross 40 complete annual observations from 1960 to 2018, LENNEP 5 SW warmed at a fitted rate of 0.35°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Lennep primary station fitted change +0.35 °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 (-1°C) | 13°F (-11°C) | 22°F (-6°C) | 1.0" | 17.0" | 30.2 | 0.0 |
| February | 32°F (0°C) | 12°F (-11°C) | 22°F (-6°C) | 0.9" | 13.3" | 27.2 | 0.0 |
| March | 40°F (5°C) | 18°F (-8°C) | 29°F (-2°C) | 1.1" | 15.5" | 29.6 | 0.0 |
| April | 48°F (9°C) | 24°F (-5°C) | 36°F (2°C) | 1.9" | 12.5" | 26.7 | 0.0 |
| May | 58°F (14°C) | 32°F (0°C) | 45°F (7°C) | 3.1" | 2.5" | 15.6 | 0.0 |
| June | 66°F (19°C) | 39°F (4°C) | 53°F (11°C) | 2.9" | 0.3" | 3.9 | 0.0 |
| July | 77°F (25°C) | 43°F (6°C) | 60°F (16°C) | 1.5" | 0.0" | 0.3 | 1.2 |
| August | 77°F (25°C) | 41°F (5°C) | 59°F (15°C) | 1.3" | 0.0" | 1.7 | 0.9 |
| September | 66°F (19°C) | 35°F (1°C) | 50°F (10°C) | 1.3" | 0.9" | 11.0 | 0.1 |
| October | 52°F (11°C) | 27°F (-3°C) | 39°F (4°C) | 1.6" | 7.9" | 23.8 | 0.0 |
| November | 38°F (3°C) | 19°F (-7°C) | 29°F (-2°C) | 1.1" | 12.5" | 27.4 | 0.0 |
| December | 30°F (-1°C) | 13°F (-11°C) | 21°F (-6°C) | 1.0" | 13.2" | 30.2 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 79°F around July 27, short of 90°F on every date, while 231 dates carry a normal low at or below freezing, the coldest 11°F near February 12.
The freezing stretch
The normal low stays at or below 32°F into May 14, then returns to freezing around September 27, covering 231 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 29, when 43% of years recorded at least a hundredth of an inch. The driest is September 3 at 24%. Summed across the calendar, that is about 119 wet dates a year.
The widest day
August 13 carries the biggest normal gap between afternoon and dawn, 36°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Lennep.
Where Lennep Stands Nationally
Winters bite deep and often: the normal nightly low dips to freezing or below on around 231 nights a year, placing this among the most frost-prone tenth of ranked stations.
Daily temperature swings run wider than most of the country, peaking near 36°F between the normal high and low.
Lennep 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: 17.0"
10.1 days with precipitation
Snow: 13.3"
9.4 days with precipitation
Snow: 15.5"
10.8 days with precipitation
Snow: 12.5"
12.3 days with precipitation
Snow: 2.5"
12.5 days with precipitation
Snow: 0.3"
11.8 days with precipitation
8.4 days with precipitation
7.7 days with precipitation
Snow: 0.9"
6.7 days with precipitation
Snow: 7.9"
9.5 days with precipitation
Snow: 12.5"
9.1 days with precipitation
Snow: 13.2"
10.8 days with precipitation
Lennep spreads its precipitation across the year
Neither half of the year dominates here: June through August take 31% of the annual total and December through February 15%, with neither reaching the 35% that would mark a distinct wet season. Lennep has no dry season to plan around, though it does carry a 38.7°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 3.1" and February 0.9". The three wettest months together take 42% 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.
Lennep is dry, and what does fall arrives gently
Only about 119 days a year record measurable precipitation here, 33% of the calendar, and they carry 18.5" 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 13 wet days; the driest is September at about 7.
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 Lennep
Lennep averages 95.6 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 61 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: 95.6 inches of depth.
- Days recording measurable snow: about 61 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 52% 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
N/A
50% probability date
Last Spring Freeze
N/A
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
9,598
Higher = more heating needed
Cooling Degree Days
28
Higher = more cooling needed
Warmest Month
July
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside MT closest to Lennep 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).
- Leeds, ND 39°F · 0.0°F off
- Stanley, ND 39°F · 0.0°F off
- Fosston, MN 39°F · 0.1°F off
- Rugby, ND 39°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (18.5" here), excluding temperature-peer places.
- Friday Harbor, WA 18.5" · 0.0" off
- Julesburg, CO 18.6" · 0.0" off
- Flasher, ND 18.5" · 0.1" off
- Glenbrook, NV 18.5" · 0.1" off
Snow and freeze rhythm
When cold and snow define Lennep
heating led · dry · mid swing
Lennep's energy balance leans toward cold weather: 9,598 annual heating degree days against 28 for cooling. Its 38.7°F seasonal range still makes the monthly rows more useful than the annual average alone.
A frost-free growing-season length is not available for Lennep. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
-
1. Lennep coldest normal
December
Averaging 21°F (-6°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Lennep typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Lennep snow peak
January
Lennep averages 95.6 inches of snow a year, with January the snowiest month on the normals.
Questions about Lennep's climate
How much snow does Lennep get? ▼
How cold does Lennep get in winter? ▼
How much energy does heating and cooling require in Lennep? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Lennep's primary station: LENNEP 5 SW (USC00244954). 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 Lennep; 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 Lennep 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.