Green Bay, WI

Wisconsin · Records since 1886–2026

☀️ 78°F
Currently in Green Bay
As of 1:30 PM CDT

Records for September 11

🔥 Record High

95°F

September 11, 1931

+21° from 74° normal

❄ Record Low

35°F

September 11, 1959

-17° from 52° normal
🌞 Normal high: 74°F 🌑 Normal low: 52°F 1991–2020 normals

All-Time Records — Green Bay

🔥
104°F
Hottest Day Ever
Jul 13, 1936
❄
-36°F
Coldest Day Ever
Jan 21, 1888
🌧
4.90"
Wettest Day Ever
Jun 22, 1990
☃
24.0"
Most Snow in One Day
Mar 1, 1888

First & Last Dates — Green Bay

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)
199 days
Longest growing season
1898
116 days
Shortest growing season
1958
155 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 95°F September 11, 1931
2 95°F September 11, 1895
3 91°F September 11, 1906
4 90°F September 11, 2005
5 90°F September 11, 1952
6 89°F September 11, 1998
7 86°F September 11, 1994
8 86°F September 11, 1981
9 86°F September 11, 1976
10 85°F September 11, 1947

Top 5 Record Lows — September 11

# Temp Date
🥶 35°F September 11, 1959
2 35°F September 11, 1958
3 36°F September 11, 1955
4 37°F September 11, 2020
5 37°F September 11, 1967
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 1886–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Green Bay

threshold: 88°F (90th percentile of historical Jun–Aug highs)
4.0
Avg heat wave length
days (historical)
94°
Avg peak temp
during heat waves
2
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1886–2026
6
2026 so far
8
Avg/year 1970–2025
6
Avg/year (last 10 complete)
34
Most in a year (1988)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Green Bay

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 26, 1973 – Sep 3, 1973 9 96°F (Aug 27) 91°F 68°F
2 Aug 26, 1937 – Sep 3, 1937 9 94°F (Aug 31) 91°F 68°F
3 Jul 7, 1936 – Jul 14, 1936 8 104°F (Jul 13) 100°F 74°F
4 Jul 22, 1941 – Jul 29, 1941 8 99°F (Jul 29) 94°F 73°F
5 Aug 14, 1955 – Aug 21, 1955 8 99°F (Aug 21) 93°F 63°F
6 Jun 30, 1921 – Jul 7, 1921 8 97°F (Jul 6) 94°F 71°F
7 Jun 17, 1995 – Jun 24, 1995 8 96°F (Jun 18) 93°F 67°F
8 Jul 17, 1987 – Jul 24, 1987 8 93°F (Jul 19) 91°F 68°F
9 Jun 26, 1910 – Jul 2, 1910 7 100°F (Jun 30) 94°F 67°F
10 Jun 30, 2012 – Jul 6, 2012 7 99°F (Jul 5) 93°F 67°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

47
2026 total
above-normal nights
38.6
Avg / summer
1970–2020
69
Most in a summer
1921

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 (1886–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1886, annual totals have trended +0.22" 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 Green Bay is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

32.00"
2026 YTD
Normal: 23.13"
+8.87"
2.75"
September so far
September normal: 3.20"
-0.45"
9
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Green Bay is 8.87" 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)
69.2°F
Average temperature
19th-warmest of 140
+2.6°
vs. average
Normal: 66.6°F (1991–2020)
3.74"
Precipitation
46th-wettest of 140
+0.33"
vs. average
Normal: 3.41" · 110% of normal

Average Temperature by Year — Aug 11 – Sep 10

1887–2026 · 2026 highlighted

Precipitation by Year — Aug 11 – Sep 10

1887–2026 · 2026 highlighted · trend +0.06" per decade (wetter since 1887)

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1947 74.3°F
2 1900 72.8°F
3 1937 72.7°F
4 1959 72.3°F
5 1948 70.8°F
6 1922 70.7°F
7 1983 70.5°F
8 1906 70.4°F
9 1991 70.4°F
10 1973 70.1°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1950 60.3°F
2 1967 61.2°F
3 1997 61.6°F
4 1986 61.7°F
5 1934 61.9°F
6 1917 61.9°F
7 1992 62.1°F
8 1887 62.2°F
9 1924 62.4°F
10 1951 62.4°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1975 9.66"
2 2018 8.42"
3 2014 8.19"
4 1985 7.35"
5 1964 7.21"
6 1995 6.81"
7 2015 6.51"
8 1910 6.50"
9 1900 6.20"
10 1997 6.17"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 1932 0.45"
2 1913 0.49"
3 1942 0.53"
4 1933 0.53"
5 1930 0.57"
6 2008 0.61"
7 1999 0.61"
8 1955 0.83"
9 1952 0.83"
10 1976 0.85"
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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