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 — Mar 1 – May 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)
48.6°F
Average temperature
9th-warmest of 101
+3.1°
vs. average
Normal: 45.5°F (1991–2020)
13.28"
Precipitation
7th-wettest of 99
+3.50"
vs. average
Normal: 9.78" · 136% of normal

Average Temperature by Year — Mar 1 – May 31

1926–2026 · 2026 highlighted · trend +0.46° per decade (warming since 1926)

Precipitation by Year — Mar 1 – May 31

1926–2026 · 2026 highlighted · trend +0.17" per decade (wetter since 1926)

Warmest Mar 1 – May 31 on Record

# Year Avg Temp
1 2012 51.9°F
2 2024 50.9°F
3 2010 50.8°F
4 1987 49.6°F
5 1998 49.2°F
6 2022 49.1°F
7 1991 49.0°F
8 2021 48.9°F
9 2026 48.6°F
10 2020 48.2°F

Coolest Mar 1 – May 31 on Record

# Year Avg Temp
1 1926 38.0°F
2 1956 39.7°F
3 1940 40.5°F
4 1943 40.5°F
5 1950 41.2°F
6 1971 41.2°F
7 1928 41.3°F
8 1932 41.4°F
9 1984 41.4°F
10 1965 41.4°F

Wettest Mar 1 – May 31 on Record

# Year Total
1 2002 15.52"
2 2011 14.96"
3 1990 14.92"
4 2017 14.53"
5 1976 14.04"
6 1992 13.84"
7 2026 13.28"
8 1991 13.02"
9 1996 12.59"
10 1955 12.45"

Driest Mar 1 – May 31 on Record

# Year Total
1 1941 3.79"
2 1946 5.09"
3 2006 5.44"
4 1935 5.57"
5 2010 6.02"
6 1927 6.07"
7 1934 6.10"
8 1981 6.15"
9 1995 6.23"
10 1957 6.26"
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.
← Back to all stations