Burlington, IA

Iowa · Records since 1897–2026

☀️ 78°F Feels like 83°
Currently in Burlington
As of 1:30 PM CDT

Records for September 11

🔥 Record High

98°F

September 11, 1936

+19° from 79° normal

❄ Record Low

38°F

September 11, 1917

-20° from 58° normal
🌞 Normal high: 79°F 🌑 Normal low: 58°F 1991–2020 normals

All-Time Records — Burlington

🔥
111°F
Hottest Day Ever
Jul 15, 1936
❄
-27°F
Coldest Day Ever
Feb 13, 1905
🌧
6.28"
Wettest Day Ever
Jun 29, 1933
☃
13.5"
Most Snow in One Day
Jan 26, 1967

First & Last Dates — Burlington

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)
225 days
Longest growing season
1998
147 days
Shortest growing season
1913
184 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 98°F September 11, 1936
2 97°F September 11, 2000
3 97°F September 11, 1912
4 96°F September 11, 1927
5 95°F September 11, 1933
6 95°F September 11, 1906
7 94°F September 11, 1931
8 93°F September 11, 1953
9 93°F September 11, 1920
10 93°F September 11, 1908

Top 5 Record Lows — September 11

# Temp Date
🥶 38°F September 11, 1917
2 41°F September 11, 1940
3 44°F September 11, 1992
4 44°F September 11, 1959
5 44°F September 11, 1955
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 1897–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Burlington

threshold: 94°F (90th percentile of historical Jun–Aug highs)
4.8
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
29
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1897–2026
20
2026 so far
28
Avg/year 1970–2025
21
Avg/year (last 10 complete)
74
Most in a year (1936)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Burlington

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 17, 1987 – Aug 3, 1987 18 104°F (Aug 1) 98°F 74°F
2 Jul 3, 1936 – Jul 18, 1936 16 111°F (Jul 14) 105°F 77°F
3 Jun 16, 1933 – Jun 27, 1933 12 103°F (Jun 26) 98°F 69°F
4 Aug 9, 1936 – Aug 19, 1936 11 105°F (Aug 18) 100°F 72°F
5 May 29, 1934 – Jun 8, 1934 11 104°F (Jun 1) 99°F 69°F
6 Jul 23, 1916 – Aug 1, 1916 10 104°F (Jul 27) 100°F 73°F
7 Jun 22, 1931 – Jul 1, 1931 10 102°F (Jun 27) 100°F 76°F
8 Aug 25, 1953 – Sep 3, 1953 10 99°F (Aug 31) 97°F 68°F
9 Jul 18, 1901 – Jul 26, 1901 9 107°F (Jul 24) 101°F 74°F
10 Aug 31, 1960 – Sep 8, 1960 9 97°F (Sep 2) 96°F 69°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
44.5
Avg / summer
1970–2020
72
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 (1897–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1897, annual totals have trended +0.33" per decade, about +4.3" 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 Burlington is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

30.22"
2026 YTD
Normal: 28.35"
+1.87"
0.00"
September so far
September normal: 3.53"
-3.53"
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 · Burlington is 1.87" ahead of the normal pace

Period Review — Jun 1 – Aug 31, 2026

Any window, evaluated against every other year on record — 92 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
74.2°F
Average temperature
59th-warmest of 126
-0.1°
vs. average
Normal: 74.3°F (1991–2020)
17.69"
Precipitation
13th-wettest of 121
+5.13"
vs. average
Normal: 12.56" · 141% of normal

Average Temperature by Year — Jun 1 – Aug 31

1899–2026 · 2026 highlighted

Precipitation by Year — Jun 1 – Aug 31

1901–2026 · 2026 highlighted · trend +0.10" per decade (wetter since 1901)

Warmest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1936 80.9°F
2 1934 80.5°F
3 1901 78.6°F
4 1983 78.1°F
5 1914 77.9°F
6 1988 77.9°F
7 2010 77.6°F
8 1933 77.4°F
9 1921 77.4°F
10 1999 77.3°F

Coolest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1915 69.2°F
2 1950 69.6°F
3 1967 70.4°F
4 1992 70.8°F
5 1958 71.0°F
6 1982 71.2°F
7 1951 71.2°F
8 2009 71.2°F
9 1974 71.4°F
10 2004 71.5°F

Wettest Jun 1 – Aug 31 on Record

# Year Total
1 1902 29.54"
2 1993 25.79"
3 1980 25.45"
4 1924 24.94"
5 2010 22.33"
6 2009 21.39"
7 2007 19.84"
8 2015 19.63"
9 1981 18.63"
10 1990 18.19"

Driest Jun 1 – Aug 31 on Record

# Year Total
1 2013 3.86"
2 1914 3.87"
3 1991 4.79"
4 2005 4.94"
5 1913 5.02"
6 2012 5.28"
7 1971 5.29"
8 2022 5.95"
9 1936 6.13"
10 1953 6.69"
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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