Stillwater, OK

Oklahoma · Records since 1893–2026

☀️ 85°F Feels like 95°
Currently in Stillwater
As of 1:30 PM CDT

Records for September 11

🔥 Record High

105°F

September 11, 2000

+17° from 88° normal

❄ Record Low

39°F

September 11, 1940

-25° from 64° normal
🌞 Normal high: 88°F 🌑 Normal low: 64°F 1991–2020 normals

All-Time Records — Stillwater

🔥
115°F
Hottest Day Ever
Aug 11, 1936
❄
-21°F
Coldest Day Ever
Feb 10, 2011
🌧
7.00"
Wettest Day Ever
May 21, 1957
☃
13.0"
Most Snow in One Day
Mar 9, 1994

First & Last Dates — Stillwater

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)
252 days
Longest growing season
2004
168 days
Shortest growing season
2013
203 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 105°F September 11, 2000
2 103°F September 11, 1956
3 101°F September 11, 1909
4 100°F September 11, 1984
5 100°F September 11, 1936
6 99°F September 11, 1895
7 98°F September 11, 2013
8 97°F September 11, 2021
9 97°F September 11, 1910
10 96°F September 11, 1939

Top 5 Record Lows — September 11

# Temp Date
🥶 39°F September 11, 1940
2 45°F September 11, 1968
3 45°F September 11, 1945
4 47°F September 11, 1907
5 48°F September 11, 1960
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 — Stillwater

threshold: 101°F (90th percentile of historical Jun–Aug highs)
5.5
Avg heat wave length
days (historical)
106°
Avg peak temp
during heat waves
78
Dangerous nights 2026
Overnights ≥ 70°F
6
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
87
2026 so far
75
Avg/year 1970–2025
94
Avg/year (last 10 complete)
128
Most in a year (1956)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Stillwater

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 25, 1956 – Aug 19, 1956 26 111°F (Aug 6) 106°F 76°F
2 Jul 2, 1954 – Jul 25, 1954 24 113°F (Jul 14) 106°F 77°F
3 Aug 7, 1936 – Aug 27, 1936 21 115°F (Aug 11) 106°F 79°F
4 Jul 17, 2012 – Aug 4, 2012 19 114°F (Aug 1) 107°F 78°F
5 Jul 10, 1934 – Jul 26, 1934 17 109°F (Jul 20) 105°F 77°F
6 Aug 19, 2000 – Sep 4, 2000 17 109°F (Sep 2) 105°F 72°F
7 Jul 13, 2022 – Jul 27, 2022 15 112°F (Jul 19) 107°F 75°F
8 Jul 29, 1934 – Aug 12, 1934 15 110°F (Jul 31) 106°F 80°F
9 Jul 26, 2011 – Aug 8, 2011 14 113°F (Aug 2) 109°F 77°F
10 Aug 29, 1939 – Sep 10, 1939 13 110°F (Sep 2) 104°F 71°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

56
2026 total
above-normal nights
36.4
Avg / summer
1970–2020
71
Most in a summer
1937

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended +0.11" per decade, about +1.4" 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 Stillwater is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

154 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

28.72"
2026 YTD
Normal: 24.73"
+3.99"
0.50"
September so far
September normal: 3.11"
-2.61"
10
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Stillwater is 3.99" ahead of the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
86.4°F
Average temperature
3rd-warmest of 129
+6.7°
vs. average
Normal: 79.7°F (1991–2020)
4.96"
Precipitation
24th-wettest of 125
+1.38"
vs. average
Normal: 3.58" · 139% of normal

Average Temperature by Year — Aug 11 – Sep 10

1894–2026 · 2026 highlighted

Precipitation by Year — Aug 11 – Sep 10

1893–2026 · 2026 highlighted · trend +0.02" per decade (wetter since 1893)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1936 89.4°F
2 1954 86.5°F
3 2026 86.4°F
4 2000 86.3°F
5 1983 84.6°F
6 1922 84.5°F
7 1998 84.2°F
8 1912 84.1°F
9 1913 83.8°F
10 2021 83.7°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1915 72.0°F
2 1967 72.7°F
3 1992 73.2°F
4 1950 73.8°F
5 1974 73.9°F
6 2004 74.0°F
7 1920 74.4°F
8 1986 74.5°F
9 1917 75.6°F
10 1953 75.8°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1942 9.36"
2 1905 8.61"
3 2018 8.31"
4 1941 7.34"
5 1906 6.96"
6 1964 6.93"
7 1894 6.85"
8 1973 6.67"
9 1904 6.64"
10 1974 6.62"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1893 0.00"
2 2000 0.07"
3 1982 0.17"
4 1978 0.48"
5 1936 0.48"
6 1925 0.51"
7 1956 0.62"
8 1945 0.63"
9 1986 0.71"
10 1995 0.75"
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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