Kalispell, MT

Montana · Records since 1899–2026

☁️ 63°F
Currently in Kalispell
As of 12:30 PM MDT

Records for September 11

🔥 Record High

92°F

September 11, 1958

+20° from 72° normal

❄ Record Low

27°F

September 11, 1921

-13° from 40° normal
🌞 Normal high: 72°F 🌑 Normal low: 40°F 1991–2020 normals

All-Time Records — Kalispell

🔥
105°F
Hottest Day Ever
Aug 4, 1961
❄
-38°F
Coldest Day Ever
Jan 31, 1950
🌧
2.71"
Wettest Day Ever
Jun 29, 1982
☃
20.1"
Most Snow in One Day
Nov 19, 1996

First & Last Dates — Kalispell

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)
172 days
Longest growing season
1938
20 days
Shortest growing season
1971
101 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 92°F September 11, 1958
2 88°F September 11, 2013
3 87°F September 11, 1990
4 87°F September 11, 1973
5 87°F September 11, 1969
6 87°F September 11, 1953
7 86°F September 11, 1959
8 86°F September 11, 1940
9 85°F September 11, 2011
10 84°F September 11, 2025

Top 5 Record Lows — September 11

# Temp Date
🥶 27°F September 11, 1921
2 29°F September 11, 2014
3 29°F September 11, 1989
4 30°F September 11, 1949
5 30°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 1899–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Kalispell

threshold: 90°F (90th percentile of historical Jun–Aug highs)
4.6
Avg heat wave length
days (historical)
95°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1900–2026
10
2026 so far
11
Avg/year 1970–2025
19
Avg/year (last 10 complete)
34
Most in a year (2003)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Kalispell

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 8, 2024 – Jul 24, 2024 17 100°F (Jul 21) 95°F 53°F
2 Jul 11, 1960 – Jul 23, 1960 13 104°F (Jul 19) 95°F 52°F
3 Jun 26, 2021 – Jul 6, 2021 11 101°F (Jun 29) 94°F 56°F
4 Aug 10, 1967 – Aug 20, 1967 11 97°F (Aug 17) 95°F 47°F
5 Jul 16, 2003 – Jul 25, 2003 10 101°F (Jul 23) 95°F 51°F
6 Aug 7, 1971 – Aug 16, 1971 10 98°F (Aug 11) 94°F 49°F
7 Jul 28, 2000 – Aug 6, 2000 10 97°F (Jul 30) 92°F 51°F
8 Jun 26, 2015 – Jul 4, 2015 9 102°F (Jun 28) 95°F 55°F
9 Jul 27, 1973 – Aug 4, 1973 9 97°F (Aug 2) 95°F 50°F
10 Jul 21, 2006 – Jul 29, 2006 9 97°F (Jul 22) 94°F 53°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

51
2026 total
above-normal nights
48.7
Avg / summer
1970–2020
81
Most in a summer
1940

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 (1899–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1899, annual totals have trended +0.24" per decade, about +3.0" 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 Kalispell is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

15.42"
2026 YTD
Normal: 11.78"
+3.64"
2.21"
September so far
September normal: 1.17"
+1.04"
2
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Kalispell is 3.64" ahead of the normal pace

Period Review — Jun 12 – Sep 10, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
63.8°F
Average temperature
35th-warmest of 127
+1.0°
vs. average
Normal: 62.8°F (1991–2020)
5.85"
Precipitation
21st-wettest of 126
+1.68"
vs. average
Normal: 4.17" · 140% of normal

Average Temperature by Year — Jun 12 – Sep 10

1899–2026 · 2026 highlighted · trend +0.12° per decade (warming since 1899)

Precipitation by Year — Jun 12 – Sep 10

1899–2026 · 2026 highlighted · trend +0.03" per decade (wetter since 1899)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 2021 67.0°F
2 1940 66.8°F
3 1936 66.8°F
4 1961 66.7°F
5 2024 66.0°F
6 2003 66.0°F
7 2013 65.6°F
8 2017 65.5°F
9 1979 65.4°F
10 2007 65.2°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1993 58.5°F
2 1899 58.5°F
3 1902 59.0°F
4 1964 59.2°F
5 1907 59.5°F
6 1912 59.7°F
7 1995 60.0°F
8 1954 60.1°F
9 1903 60.4°F
10 1965 60.4°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1993 10.21"
2 1916 7.97"
3 1911 7.61"
4 1950 7.37"
5 2014 7.36"
6 1965 7.20"
7 1956 6.97"
8 1976 6.83"
9 1954 6.74"
10 1948 6.70"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 2015 1.15"
2 1917 1.27"
3 1929 1.29"
4 2017 1.37"
5 2007 1.39"
6 1962 1.58"
7 2018 1.65"
8 1973 1.71"
9 1967 1.77"
10 2003 1.88"
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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