Glasgow weather in May: Glasgow, Montana: normal highs, lows, rain and records for May
Glasgow in May has a normal high of 68°F and a normal low of 43°F, a daily mean of 56°F, rising from 63°F on the 1st to 72°F by the 31st. Measurable precipitation falls on 11 days in a normal May, 2.22 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 20°C and low of 6°C, 56 mm of precipitation and 2 cm of snow in May.
- NOAA stationGlasgow International Airport
- Station IDUSW00094008
- Location48.21°N 106.62°W
- Elevation2,285 ft (697 m)
- Population3,169
- Jan 24° 6°
- Feb 28° 9°
- Mar 42° 21°
- Apr 57° 33°
- May 68° 43°
- Jun 76° 53°
- Jul 86° 59°
- Aug 85° 57°
- Sep 73° 47°
- Oct 57° 34°
- Nov 40° 21°
- Dec 27° 10°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Glasgow in May?
The normal high is 68°F and the normal low 43°F, for a daily mean of 55.5°F. May is 10.7°F warmer than April and 9.0°F cooler than June. May is the 5th warmest month of the year in Glasgow and the 2nd wettest. Across the month the normal high rises 9°F, from 63°F on May 1 to 72°F on May 31. From one year to the next May's mean temperature typically moves about 2.9°F either way (NOAA's standard deviation), so roughly two Mays in three average between 53°F and 58°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 40%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 63°F | 37°F | 30% | 14% |
| May 8 | 65°F | 40°F | 32% | 15% |
| May 15 | 68°F | 43°F | 34% | 16% |
| May 22 | 70°F | 46°F | 38% | 19% |
| May 31 | 72°F | 49°F | 40% | 21% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 63°F | 37°F | 30% | 14% | 14 h 30 min |
| May 2 | 63°F | 38°F | 30% | 14% | 14 h 30 min |
| May 3 | 63°F | 38°F | 31% | 14% | 14 h 30 min |
| May 4 | 64°F | 39°F | 31% | 14% | 14 h 40 min |
| May 5 | 64°F | 39°F | 31% | 14% | 14 h 40 min |
| May 6 | 64°F | 39°F | 32% | 15% | 14 h 40 min |
| May 7 | 65°F | 40°F | 32% | 15% | 14 h 50 min |
| May 8 | 65°F | 40°F | 32% | 15% | 14 h 50 min |
| May 9 | 66°F | 41°F | 32% | 15% | 14 h 50 min |
| May 10 | 66°F | 41°F | 33% | 15% | 15 h |
| May 11 | 66°F | 41°F | 33% | 16% | 15 h |
| May 12 | 67°F | 42°F | 33% | 16% | 15 h |
| May 13 | 67°F | 42°F | 34% | 16% | 15 h |
| May 14 | 67°F | 43°F | 34% | 16% | 15 h 10 min |
| May 15 | 68°F | 43°F | 34% | 16% | 15 h 10 min |
| May 16 | 68°F | 43°F | 35% | 17% | 15 h 10 min |
| May 17 | 68°F | 44°F | 35% | 17% | 15 h 10 min |
| May 18 | 69°F | 44°F | 36% | 17% | 15 h 20 min |
| May 19 | 69°F | 45°F | 36% | 18% | 15 h 20 min |
| May 20 | 69°F | 45°F | 37% | 18% | 15 h 20 min |
| May 21 | 69°F | 45°F | 37% | 18% | 15 h 20 min |
| May 22 | 70°F | 46°F | 38% | 19% | 15 h 30 min |
| May 23 | 70°F | 46°F | 38% | 19% | 15 h 30 min |
| May 24 | 70°F | 47°F | 38% | 19% | 15 h 30 min |
| May 25 | 71°F | 47°F | 39% | 20% | 15 h 30 min |
| May 26 | 71°F | 47°F | 39% | 20% | 15 h 40 min |
| May 27 | 71°F | 48°F | 39% | 20% | 15 h 40 min |
| May 28 | 71°F | 48°F | 40% | 20% | 15 h 40 min |
| May 29 | 72°F | 48°F | 40% | 21% | 15 h 40 min |
| May 30 | 72°F | 49°F | 40% | 21% | 15 h 40 min |
| May 31 | 72°F | 49°F | 40% | 21% | 15 h 40 min |
- Normal high
- 68°FMay average
- Normal low
- 43°FMay average
- Precipitation
- 2.22 inmonth total
- Days with precipitation
- 110.01 inch or more
- Snowfall
- 0.9 inmonth total
- Days at 90°F or more
- 1
- Nights at 32°F or colder
- 4
- Daylight
- 14 h 30 min to 15 h 40 minMay 1 to May 31
- Days at 70°F or more
- 14
- Days at 80°F or more
- 4
- Sunshine
- 75%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00094008; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Glasgow in May?
On a given May day the chance of 0.01 inch or more is 35% on average, highest around May 31 (40%). In all, 2.22 in falls on 11 days of a normal May.
In a normal May in Glasgow, 1 days reach 90°F, 4 nights fall to freezing and snowfall averages 0.9 inches.
Snow falls on 1 day in a normal May.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00094008.
How humid and windy is Glasgow in May?
At 3 p.m. the normal temperature is 70°F with 38% relative humidity and a dew point of 43°F; at 6 a.m. it is 52°F with 75% humidity. The wind averages 11.7 mph, most often from the north-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 52°F | 45°F | 75% | 10.1 mph | 64% |
| 9 a.m. | 61°F | 45°F | 56% | 12.4 mph | 61% |
| noon | 67°F | 44°F | 42% | 14.0 mph | 56% |
| 3 p.m. | 70°F | 43°F | 38% | 13.7 mph | 55% |
| 6 p.m. | 68°F | 43°F | 41% | 13.0 mph | 61% |
| 9 p.m. | 59°F | 44°F | 59% | 10.5 mph | 63% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00094008. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Glasgow?
The warmest May temperature on Glasgow's official record (since 1893) is 102°F, on May 18, 1948; the coldest is 15°F, on May 6, 1929. The wettest May brought 6.97 in (2011); the snowiest, 10.7 inches (1983).
The May mean against the 1991-2020 normal of 55.5°F: 2021 53.4°F (−2.1), 2022 54.9°F (−0.6), 2023 63.0°F (+7.5), 2024 55.5°F (at normal), 2025 58.2°F (+2.7), 2026 57.6°F (+2.1). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 53.4°F | −2.1°F | 1.55 in |
| 2022 | 54.9°F | −0.6°F | 2.11 in |
| 2023 | 63.0°F | +7.5°F | 3.89 in |
| 2024 | 55.5°F | at normal | 2.67 in |
| 2025 | 58.2°F | +2.7°F | 1.43 in |
| 2026 | 57.6°F | +2.1°F | 2.22 in |
Source: records: ACIS, NWS threaded record GGWthr; recent months: ACIS, station USW00094008. Records and recent months use complete months only.
How does May in Glasgow compare across Montana?
Across the 141 places PlainClimate covers in Montana, May normal highs run from 54°F in Cooke City to 72°F in Savage; Glasgow's is 68°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.