Rochester, NY

New York · Records since 1872–2026

☀️ 71°F
Currently in Rochester
As of 2:15 PM EDT

Records for September 11

🔥 Record High

94°F

September 11, 1931

+18° from 76° normal

❄ Record Low

37°F

September 11, 1879

-18° from 55° normal
🌞 Normal high: 76°F 🌑 Normal low: 55°F 1991–2020 normals

All-Time Records — Rochester

🔥
102°F
Hottest Day Ever
Jul 10, 1936
❄
-22°F
Coldest Day Ever
Feb 9, 1934
🌧
4.14"
Wettest Day Ever
Aug 29, 1893
☃
29.8"
Most Snow in One Day
Mar 1, 1900

First & Last Dates — Rochester

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)
216 days
Longest growing season
1938
122 days
Shortest growing season
1963
173 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 94°F September 11, 1931
2 92°F September 11, 2013
3 92°F September 11, 1952
4 92°F September 11, 1896
5 92°F September 11, 1895
6 91°F September 11, 1900
7 90°F September 11, 1947
8 90°F September 11, 1936
9 90°F September 11, 1925
10 89°F September 11, 1961

Top 5 Record Lows — September 11

# Temp Date
🥶 37°F September 11, 1879
2 38°F September 11, 1967
3 41°F September 11, 1995
4 41°F September 11, 1917
5 41°F September 11, 1898
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 1872–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Rochester

threshold: 89°F (90th percentile of historical Jun–Aug highs)
3.9
Avg heat wave length
days (historical)
94°
Avg peak temp
during heat waves
7
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1872–2026
6
2026 so far
10
Avg/year 1970–2025
11
Avg/year (last 10 complete)
32
Most in a year (1952)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Rochester

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 27, 1953 – Sep 4, 1953 9 99°F (Sep 3) 95°F 68°F
2 Aug 28, 1973 – Sep 5, 1973 9 95°F (Sep 4) 93°F 70°F
3 Aug 9, 1944 – Aug 16, 1944 8 97°F (Aug 11) 93°F 68°F
4 Jul 30, 1955 – Aug 6, 1955 8 96°F (Aug 1) 93°F 71°F
5 Jun 25, 1963 – Jul 2, 1963 8 95°F (Jul 2) 92°F 62°F
6 Jul 2, 1921 – Jul 8, 1921 7 97°F (Jul 8) 94°F 72°F
7 Aug 10, 2002 – Aug 16, 2002 7 97°F (Aug 14) 92°F 67°F
8 Aug 5, 1900 – Aug 11, 1900 7 96°F (Aug 6) 94°F 71°F
9 Jun 29, 2018 – Jul 5, 2018 7 96°F (Jul 4) 93°F 69°F
10 Jun 2, 1925 – Jun 8, 1925 7 95°F (Jun 5) 92°F 70°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

45
2026 total
above-normal nights
38.4
Avg / summer
1970–2020
64
Most in a summer
1938

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 (1871–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1871, annual totals have trended +0.09" 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 Rochester is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

33.89"
2026 YTD
Normal: 24.27"
+9.62"
2.23"
September so far
September normal: 3.18"
-0.95"
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 · Rochester is 9.62" 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)
70.0°F
Average temperature
60th-warmest of 154
+0.1°
vs. average
Normal: 69.9°F (1991–2020)
14.21"
Precipitation
5th-wettest of 154
+4.15"
vs. average
Normal: 10.06" · 141% of normal

Average Temperature by Year — Jun 12 – Sep 10

1872–2026 · 2026 highlighted · trend +0.08° per decade (warming since 1872)

Precipitation by Year — Jun 12 – Sep 10

1871–2026 · 2026 highlighted · trend +0.12" per decade (wetter since 1871)

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 2016 73.7°F
2 2018 73.0°F
3 1921 72.8°F
4 1949 72.8°F
5 2002 72.5°F
6 1973 72.4°F
7 1959 72.3°F
8 1955 72.1°F
9 1983 72.0°F
10 1952 71.9°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1992 65.7°F
2 1986 66.2°F
3 1903 66.3°F
4 1902 66.5°F
5 2004 66.6°F
6 1885 66.7°F
7 1997 66.9°F
8 1958 66.9°F
9 2009 67.0°F
10 1963 67.0°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1998 20.06"
2 2004 16.36"
3 2023 15.34"
4 2006 14.65"
5 2026 14.21"
6 1947 13.91"
7 1981 13.91"
8 1905 13.65"
9 1987 13.43"
10 1871 12.65"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 1887 4.16"
2 1899 4.52"
3 1923 4.66"
4 1936 4.78"
5 1964 4.88"
6 1907 4.93"
7 1959 5.05"
8 1952 5.25"
9 2016 5.42"
10 1991 5.42"
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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