Jefferson City, MO

Missouri · Records since 1894–2026

☁️ 79°F Feels like 85°
Currently in Jefferson City
As of 1:30 PM CDT

Records for September 11

🔥 Record High

100°F

September 11, 1936

+18° from 82° normal

❄ Record Low

37°F

September 11, 1940

-22° from 59° normal
🌞 Normal high: 82°F 🌑 Normal low: 59°F 1991–2020 normals

All-Time Records — Jefferson City

🔥
114°F
Hottest Day Ever
Jul 12, 1901
❄
-25°F
Coldest Day Ever
Feb 12, 1899
🌧
7.50"
Wettest Day Ever
Dec 20, 1895
☃
14.0"
Most Snow in One Day
Jan 19, 1995

First & Last Dates — Jefferson City

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)
230 days
Longest growing season
1944
140 days
Shortest growing season
1961
198 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 100°F September 11, 1936
2 98°F September 11, 2000
3 98°F September 11, 1933
4 96°F September 11, 1953
5 95°F September 11, 2013
6 95°F September 11, 1938
7 95°F September 11, 1928
8 95°F September 11, 1909
9 94°F September 11, 1908
10 94°F September 11, 1906

Top 5 Record Lows — September 11

# Temp Date
🥶 37°F September 11, 1940
2 39°F September 11, 1968
3 40°F September 11, 1959
4 42°F September 11, 1917
5 43°F September 11, 1976
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 1894–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Jefferson City

threshold: 97°F (90th percentile of historical Jun–Aug highs)
5.0
Avg heat wave length
days (historical)
102°
Avg peak temp
during heat waves
50
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1895–2026
44
2026 so far
49
Avg/year 1970–2025
48
Avg/year (last 10 complete)
111
Most in a year (1901)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Jefferson City

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 8, 1934 – Jul 25, 1934 18 112°F (Jul 24) 106°F 76°F
2 Jul 3, 1936 – Jul 19, 1936 17 112°F (Jul 14) 105°F 74°F
3 Jul 5, 1980 – Jul 21, 1980 17 108°F (Jul 16) 104°F 75°F
4 Aug 12, 1936 – Aug 28, 1936 17 106°F (Aug 15) 102°F 76°F
5 Jun 20, 1901 – Jul 6, 1901 17 105°F (Jun 26) 103°F 74°F
6 Aug 3, 1934 – Aug 15, 1934 13 111°F (Aug 9) 105°F 75°F
7 Jun 27, 2012 – Jul 7, 2012 11 107°F (Jun 28) 103°F 73°F
8 Jul 24, 1953 – Aug 3, 1953 11 104°F (Jul 31) 101°F 70°F
9 Jul 24, 1940 – Aug 3, 1940 11 102°F (Jul 29) 101°F 72°F
10 Jul 25, 1987 – Aug 3, 1987 10 106°F (Aug 2) 100°F 68°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

54
2026 total
above-normal nights
34.7
Avg / summer
1970–2020
73
Most in a summer
2010

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 -0.03" per decade, about -0.3" 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 Jefferson City is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

26.92"
2026 YTD
Normal: 28.99"
-2.07"
1.00"
September so far
September normal: 3.73"
-2.73"
6
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Jefferson City is 2.07" behind the normal pace

Period Review — Sep 1 – Nov 30, 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)
2026 is still under way for this window — totals and rankings appear once November 30 passes.

Average Temperature by Year — Sep 1 – Nov 30

1895–2025 · 2026 highlighted

Precipitation by Year — Sep 1 – Nov 30

1896–2025 · 2026 highlighted · trend -0.09" per decade (drier since 1896)

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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