Glasgow, MT

Montana · Records since 1893–2026

☁️ 56°F
Currently in Glasgow
As of 12:30 PM MDT

Records for September 11

🔥 Record High

95°F

September 11, 1919

+20° from 75° normal

❄ Record Low

26°F

September 11, 1989

-23° from 49° normal
🌞 Normal high: 75°F 🌑 Normal low: 49°F 1991–2020 normals

All-Time Records — Glasgow

🔥
113°F
Hottest Day Ever
Jul 31, 1900
❄
-59°F
Coldest Day Ever
Feb 15, 1936
🌧
3.26"
Wettest Day Ever
Aug 25, 1933
☃
14.1"
Most Snow in One Day
Apr 2, 1940

First & Last Dates — Glasgow

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)
171 days
Longest growing season
1987
74 days
Shortest growing season
1928
135 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 1919
2 93°F September 11, 1971
3 92°F September 11, 1948
4 91°F September 11, 1990
5 90°F September 11, 2017
6 90°F September 11, 2011
7 90°F September 11, 1969
8 90°F September 11, 1966
9 90°F September 11, 1940
10 89°F September 11, 2022

Top 5 Record Lows — September 11

# Temp Date
🥶 26°F September 11, 1989
2 27°F September 11, 1955
3 29°F September 11, 1903
4 30°F September 11, 1902
5 31°F September 11, 1913
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Glasgow

threshold: 96°F (90th percentile of historical Jun–Aug highs)
3.9
Avg heat wave length
days (historical)
103°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

Days ≥ 90°F Per Year

1894–2026
27
2026 so far
28
Avg/year 1970–2025
33
Avg/year (last 10 complete)
66
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Glasgow

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 14, 1936 – Jul 25, 1936 12 112°F (Jul 18) 103°F 65°F
2 Jul 2, 1936 – Jul 11, 1936 10 108°F (Jul 5) 102°F 64°F
3 Jul 18, 2024 – Jul 25, 2024 8 109°F (Jul 24) 99°F 68°F
4 Jul 24, 1926 – Jul 31, 1926 8 107°F (Jul 30) 100°F 61°F
5 Jul 15, 1901 – Jul 22, 1901 8 103°F (Jul 21) 99°F 54°F
6 Jul 23, 1929 – Jul 29, 1929 7 108°F (Jul 24) 102°F 56°F
7 Jun 22, 1936 – Jun 28, 1936 7 107°F (Jun 27) 101°F 62°F
8 Jul 21, 1931 – Jul 27, 1931 7 106°F (Jul 23) 101°F 62°F
9 Jul 26, 1914 – Aug 1, 1914 7 103°F (Jul 28) 99°F 63°F
10 Jun 20, 1900 – Jun 25, 1900 6 109°F (Jun 22) 103°F 66°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

43
2026 total
above-normal nights
34.5
Avg / summer
1970–2020
60
Most in a summer
1961

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1894–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1894, annual totals have trended +0.10" per decade, about +1.3" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How Glasgow is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

146 of 252 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

13.91"
2026 YTD
Normal: 10.92"
+2.99"
1.44"
September so far
September normal: 1.06"
+0.38"
3
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Glasgow is 2.99" ahead of the normal pace

Period Review — Sep 3 – Sep 10, 2026

Any window, evaluated against every other year on record — 8 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
68.1°F
Average temperature
16th-warmest of 127
+4.6°
vs. average
Normal: 63.4°F (1991–2020)
1.42"
Precipitation
5th-wettest of 127
+1.07"
vs. average
Normal: 0.35" · 406% of normal

Average Temperature by Year — Sep 3 – Sep 10

1894–2026 · 2026 highlighted · trend +0.30° per decade (warming since 1894)

Precipitation by Year — Sep 3 – Sep 10

1894–2026 · 2026 highlighted

Warmest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1998 75.7°F
2 1963 72.0°F
3 2013 72.0°F
4 1990 71.3°F
5 2022 71.1°F
6 2003 70.3°F
7 1931 70.1°F
8 1942 70.0°F
9 2024 70.0°F
10 1967 69.8°F

Coolest Sep 3 – Sep 10 on Record

# Year Avg Temp
1 1929 50.8°F
2 1965 51.4°F
3 1962 51.6°F
4 1964 52.5°F
5 1985 53.0°F
6 1986 54.1°F
7 2008 54.1°F
8 1895 54.2°F
9 1989 54.7°F
10 1956 54.9°F

Wettest Sep 3 – Sep 10 on Record

# Year Total
1 1938 4.72"
2 1916 2.11"
3 2019 1.54"
4 2013 1.53"
5 2026 1.42"
6 2010 1.31"
7 1946 1.28"
8 1921 1.14"
9 2020 1.00"
10 1927 0.97"

Driest Sep 3 – Sep 10 on Record

# Year Total
1 2025 0.00"
2 2024 0.00"
3 2022 0.00"
4 2021 0.00"
5 2018 0.00"
6 2017 0.00"
7 2011 0.00"
8 2006 0.00"
9 2004 0.00"
10 1997 0.00"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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