Oswego, NY

New York · Records since 1926–2026

☀️ 68°F Feels like 66°
Currently in Oswego
As of 2:30 PM EDT

Records for September 11

🔥 Record High

91°F

September 11, 1931

+17° from 74° normal

❄ Record Low

42°F

September 11, 2006

-15° from 57° normal
🌞 Normal high: 74°F 🌑 Normal low: 57°F 1991–2020 normals

All-Time Records — Oswego

🔥
97°F
Hottest Day Ever
Aug 14, 2002
❄
-23°F
Coldest Day Ever
Dec 29, 1933
🌧
3.80"
Wettest Day Ever
Jul 3, 1974
☃
40.0"
Most Snow in One Day
Dec 8, 1958

First & Last Dates — Oswego

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)
219 days
Longest growing season
2010
141 days
Shortest growing season
1947
183 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 91°F September 11, 1931
2 90°F September 11, 2013
3 90°F September 11, 1961
4 88°F September 11, 1947
5 86°F September 11, 1955
6 86°F September 11, 1936
7 85°F September 11, 2016
8 85°F September 11, 2002
9 83°F September 11, 1983
10 83°F September 11, 1971

Top 5 Record Lows — September 11

# Temp Date
🥶 42°F September 11, 2006
2 42°F September 11, 1995
3 43°F September 11, 1979
4 45°F September 11, 2017
5 45°F September 11, 2008
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 1926–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Oswego

threshold: 86°F (90th percentile of historical Jun–Aug highs)
3.8
Avg heat wave length
days (historical)
91°
Avg peak temp
during heat waves
15
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1927–2026
3
2026 so far
4
Avg/year 1970–2025
4
Avg/year (last 10 complete)
18
Most in a year (1988)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Oswego

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 11, 2002 – Aug 18, 2002 8 97°F (Aug 14) 89°F 69°F
2 Jul 5, 1993 – Jul 11, 1993 7 93°F (Jul 6) 89°F 69°F
3 Jul 15, 1977 – Jul 21, 1977 7 92°F (Jul 20) 89°F 69°F
4 Aug 15, 1995 – Aug 21, 1995 7 90°F (Aug 19) 88°F 67°F
5 Jul 6, 1988 – Jul 11, 1988 6 94°F (Jul 9) 90°F 67°F
6 Aug 5, 2001 – Aug 10, 2001 6 94°F (Aug 9) 90°F 70°F
7 Jul 8, 1987 – Jul 13, 1987 6 93°F (Jul 12) 89°F 70°F
8 Jul 28, 2002 – Aug 2, 2002 6 93°F (Aug 2) 88°F 71°F
9 Jul 17, 1991 – Jul 22, 1991 6 92°F (Jul 20) 89°F 70°F
10 Jun 24, 2005 – Jun 29, 2005 6 92°F (Jun 25) 89°F 67°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

52
2026 total
above-normal nights
38.3
Avg / summer
1970–2020
67
Most in a summer
2020

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 (1926–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1926, annual totals have trended +1.25" per decade, about +12.4" 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 Oswego is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

27.83"
2026 YTD
Normal: 27.81"
+0.02"
1.31"
September so far
September normal: 3.92"
-2.61"
4
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Oswego is running right at normal

Period Review — Sep 1 – Sep 10, 2026

Any window, evaluated against every other year on record — 10 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
70.6°F
Average temperature
15th-warmest of 101
+3.8°
vs. average
Normal: 66.8°F (1991–2020)
1.31"
Precipitation
30th-wettest of 101
+0.04"
vs. average
Normal: 1.27" · 103% of normal

Average Temperature by Year — Sep 1 – Sep 10

1926–2026 · 2026 highlighted · trend +0.20° per decade (warming since 1926)

Precipitation by Year — Sep 1 – Sep 10

1926–2026 · 2026 highlighted · trend +0.08" per decade (wetter since 1926)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1959 76.7°F
2 1961 74.8°F
3 2015 74.2°F
4 1929 73.4°F
5 1945 72.0°F
6 1999 72.0°F
7 1983 71.8°F
8 1953 71.7°F
9 1971 71.6°F
10 2014 71.0°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1938 58.7°F
2 1994 59.4°F
3 2017 60.0°F
4 1935 60.4°F
5 1951 60.5°F
6 1975 60.6°F
7 1926 60.9°F
8 1974 60.9°F
9 1928 61.3°F
10 1963 61.3°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 2013 3.76"
2 2004 3.42"
3 2010 3.35"
4 1981 3.24"
5 2011 3.22"
6 1965 2.84"
7 1980 2.69"
8 2012 2.65"
9 1993 2.24"
10 2024 2.24"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2009 0.00"
2 1955 0.00"
3 1932 0.01"
4 1977 0.03"
5 1959 0.03"
6 1945 0.04"
7 2000 0.05"
8 2003 0.07"
9 1986 0.08"
10 2005 0.11"
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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