Glasgow, 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 Glasgow's primary NOAA station, GLASGOW INTL AP - 2 stations mapped to the area.
The climate verdict for Glasgow
Winter sets the terms in Glasgow, Montana. A pronounced 57.4°F seasonal swing and heating demand above twice the cooling total frame an annual average of 44°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.
- 44°F
- average temperature, NOAA 1991-2020 normal
- 39/100
- comfort score, above 4% of station-mapped location scores
- 13.4"
- annual precipitation · 41" snow
- 147 days
- frost-free days per growing season
Glasgow: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00094008 · Glasgow, MT 44°F mean · 13.4" precip
TEMP-COOL · RANK-COOL · PHOTO-FINISH · PRCP-DRY · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-MULTI · BOOK-FULL
- TEMP-COOL 44°F
- RANK-COOL #1,029
- PHOTO-FINISH ≈ St Peter
- PRCP-DRY 13.4"
- SWING-WIDE 57°F
- COMF-LOW 39/100
- LOAD-HEAT 8,245 HDD
- STN-MULTI USW00094008
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: St Peter, MN (+ 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.
- Glasgow (this station) 44°F
- Cold Madison Wwtp, MN 44°F
- Hot Faulkton, SD 44°F
- Near St Peter, MN 44°F
- Near Redfield, SD 44°F
Glasgow 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 · Glasgow
Glasgow: 32/100 · grade F
Glasgow publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Glasgow, not an official NOAA rating. Rankings still use Comfort Score 39/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Summer moisture balance | 48.1°F mean dew point | 83/100 · B |
| Normal heat + freeze calendar | 176 calendar days | 28/100 · F |
| Snowfall burden | 40.7 inches/year | 27/100 · F |
| Frost-free season | 147 days/year | 23/100 · F |
| Precipitation balance | 13.4 in · 21.6 from 35 in | 23/100 · F |
| Annual temperature balance | 43.9°F · 23.6° from 67.5°F | 16/100 · F |
Glasgow · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Glasgow'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
- 72.0°F
- Coldest month
- 14.6°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 Glasgow sits across the climate record
Three NOAA fields for Glasgow's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Cooler than 85%
- Among 6,861 stations, Glasgow sits in the cooler third of annual means.
- Annual precipitation
- Drier than 86%
- Glasgow's annual total ranks in the drier third of 6,352 measured normals.
- Seasonal temperature swing
- Wider than 95%
- Warmest-to-coldest month gap for Glasgow is large versus 6,861 complete station-years.
How Glasgow compares across U.S. station-mapped locations
Glasgow'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
Glasgow's measured station temperature trend
MethodologyAcross 119 complete annual observations from 1894 to 2025, GLASGOW INTL AP warmed at a fitted rate of 0.18°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Glasgow primary station fitted change +0.18 °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 | 24°F (-5°C) | 6°F (-15°C) | 15°F (-10°C) | 0.4" | 9.8" | 30.7 | 0.0 |
| February | 28°F (-2°C) | 9°F (-13°C) | 19°F (-7°C) | 0.3" | 6.2" | 27.8 | 0.0 |
| March | 42°F (5°C) | 21°F (-6°C) | 32°F (0°C) | 0.5" | 5.6" | 27.7 | 0.0 |
| April | 57°F (14°C) | 33°F (0°C) | 45°F (7°C) | 1.0" | 2.5" | 16.2 | 0.0 |
| May | 68°F (20°C) | 43°F (6°C) | 56°F (13°C) | 2.2" | 0.9" | 3.7 | 0.5 |
| June | 76°F (25°C) | 53°F (12°C) | 65°F (18°C) | 2.8" | 0.0" | 0.0 | 2.2 |
| July | 86°F (30°C) | 59°F (15°C) | 72°F (22°C) | 1.9" | 0.0" | 0.0 | 10.4 |
| August | 85°F (29°C) | 57°F (14°C) | 71°F (22°C) | 1.3" | 0.0" | 0.0 | 10.3 |
| September | 73°F (23°C) | 47°F (8°C) | 60°F (16°C) | 1.1" | 0.0" | 1.4 | 2.5 |
| October | 57°F (14°C) | 34°F (1°C) | 45°F (7°C) | 0.9" | 1.5" | 14.8 | 0.0 |
| November | 40°F (4°C) | 21°F (-6°C) | 30°F (-1°C) | 0.5" | 5.9" | 27.4 | 0.0 |
| December | 27°F (-3°C) | 10°F (-12°C) | 19°F (-7°C) | 0.4" | 8.3" | 30.9 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 88°F around July 28, short of 90°F on every date, while 176 dates carry a normal low at or below freezing, the coldest 6°F near January 10.
The freezing stretch
The normal low stays at or below 32°F into April 12, then returns to freezing around October 20, covering 176 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 12, when 42% of years recorded at least a hundredth of an inch. The driest is November 1 at 20%. Summed across the calendar, that is about 95 wet dates a year.
The widest day
August 4 carries the biggest normal gap between afternoon and dawn, 28°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Glasgow.
Where Glasgow Stands Nationally
A drier-than-most normal water year — around 13 inches, below what four out of five ranked stations collect.
Glasgow earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 9.8"
7.8 days with precipitation
Snow: 6.2"
6.4 days with precipitation
Snow: 5.6"
6.8 days with precipitation
Snow: 2.5"
7.8 days with precipitation
Snow: 0.9"
10.6 days with precipitation
12.7 days with precipitation
9.2 days with precipitation
7.6 days with precipitation
6.7 days with precipitation
Snow: 1.5"
6.7 days with precipitation
Snow: 5.9"
6.2 days with precipitation
Snow: 8.3"
6.6 days with precipitation
Glasgow runs a summer-peaked wet season
45% of Glasgow'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 2.8", on a wide 57.4°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, May, July, taking 52% of the annual total between them.
- Driest month: February at 0.3".
- Winter share: 9% 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.
Glasgow is dry, and what does fall arrives gently
Only about 95 days a year record measurable precipitation here, 26% of the calendar, and they carry 13.4" between them. At roughly 0.14 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 June at about 13 wet days; the driest is November at about 6.
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 Glasgow
Glasgow averages 40.7 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 36 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: 40.7 inches of depth.
- Days recording measurable snow: about 36 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 30% 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 30
50% probability date
Last Spring Freeze
May 6
50% probability date
Growing Season
147 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
8,245
Higher = more heating needed
Cooling Degree Days
586
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 79% | 9.3 | 52% | 29% |
| February | 74% | 10.1 | 47% | 35% |
| March | 60% | 11.8 | 50% | 27% |
| April | 52% | 12.2 | 48% | 26% |
| May | 57% | 11.7 | 51% | 22% |
| June | 55% | 10.5 | 64% | 12% |
| July | 48% | 10.3 | 73% | 6% |
| August | 47% | 10.5 | 70% | 10% |
| September | 55% | 10.4 | 64% | 17% |
| October | 66% | 10.5 | 55% | 28% |
| November | 76% | 9.4 | 50% | 34% |
| December | 78% | 9.0 | 51% | 31% |
Nationwide similar cities
Other rankable U.S. places outside MT closest to Glasgow 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 (44°F here).
- Bethel, ME 44°F · 0.0°F off
- Colton, NY 44°F · 0.0°F off
- Dayton, WY 44°F · 0.0°F off
- Del Norte, CO 44°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (13.4" here), excluding temperature-peer places.
- Briggsdale, CO 13.4" · 0.0" off
- Glendo, WY 13.4" · 0.0" off
- Stockton, CA 13.4" · 0.0" off
- Weiser, ID 13.4" · 0.0" off
Snow and freeze rhythm
When cold and snow define Glasgow
heating led · dry · high swing
Winter and seasonal range jointly define this record. Glasgow logs 8,245 heating degree days, more than twice its 586 cooling total, while the typical coldest-to-warmest-month gap reaches 57.4°F. The annual mean therefore compresses two materially different seasons.
Only about 147 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. Glasgow coldest normal
January
Averaging 15°F (-10°C), this month sits below freezing for the month as a whole, not merely overnight.
-
2. Glasgow typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Glasgow snow peak
January
Glasgow averages 40.7 inches of snow a year, with January the snowiest month on the normals.
Questions about Glasgow's climate
How much snow does Glasgow get? ▼
How cold does Glasgow get in winter? ▼
How much energy does heating and cooling require in Glasgow? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Glasgow's primary station: GLASGOW INTL AP (USW00094008). 2 NOAA stations are mapped to the Glasgow 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 3031075). Match rule for Glasgow: 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 Glasgow 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.