Trenton, NJ

New Jersey · Records since 1865–2026

⛅ 80°F Feels like 84°
Currently in Trenton
As of 2:30 PM EDT

Records for September 11

🔥 Record High

100°F

September 11, 1983

+21° from 79° normal

❄ Record Low

40°F

September 11, 1917

-19° from 59° normal
🌞 Normal high: 79°F 🌑 Normal low: 59°F 1991–2020 normals

All-Time Records — Trenton

🔥
106°F
Hottest Day Ever
Jul 22, 2011
❄
-16°F
Coldest Day Ever
Jan 22, 1984
🌧
7.25"
Wettest Day Ever
Sep 16, 1999
☃
21.0"
Most Snow in One Day
Mar 12, 1888

First & Last Dates — Trenton

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)
253 days
Longest growing season
1945
142 days
Shortest growing season
1996
193 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 100°F September 11, 1983
2 95°F September 11, 1931
3 94°F September 11, 1912
4 94°F September 11, 1897
5 93°F September 11, 2013
6 92°F September 11, 1964
7 92°F September 11, 1896
8 91°F September 11, 1961
9 91°F September 11, 1895
10 89°F September 11, 2019

Top 5 Record Lows — September 11

# Temp Date
🥶 40°F September 11, 1917
2 43°F September 11, 1995
3 43°F September 11, 1924
4 44°F September 11, 1994
5 46°F September 11, 1985
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 1865–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Trenton

threshold: 92°F (90th percentile of historical Jun–Aug highs)
4.1
Avg heat wave length
days (historical)
97°
Avg peak temp
during heat waves
25
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1865–2026
18
2026 so far
18
Avg/year 1970–2025
24
Avg/year (last 10 complete)
52
Most in a year (2010)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Trenton

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 4, 1993 – Jul 14, 1993 11 100°F (Jul 7) 96°F 72°F
2 Jul 23, 1999 – Aug 2, 1999 11 99°F (Aug 1) 96°F 71°F
3 Jul 12, 1983 – Jul 21, 1983 10 99°F (Jul 15) 95°F 71°F
4 Aug 5, 1896 – Aug 13, 1896 9 99°F (Aug 6) 97°F 77°F
5 Jul 17, 1987 – Jul 25, 1987 9 99°F (Jul 21) 96°F 66°F
6 Aug 11, 2002 – Aug 19, 2002 9 99°F (Aug 14) 96°F 72°F
7 Jul 17, 2011 – Jul 24, 2011 8 106°F (Jul 22) 98°F 75°F
8 Jul 16, 1991 – Jul 23, 1991 8 101°F (Jul 19) 97°F 69°F
9 Aug 27, 1953 – Sep 3, 1953 8 100°F (Sep 2) 97°F 72°F
10 Aug 28, 1973 – Sep 4, 1973 8 98°F (Aug 28) 95°F 74°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
45.2
Avg / summer
1970–2020
66
Most in a summer
1898

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 (1865–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1865, annual totals have trended +0.14" per decade, about +2.3" 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 Trenton is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

29.37"
2026 YTD
Normal: 31.87"
-2.50"
1.47"
September so far
September normal: 4.05"
-2.58"
8
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Trenton is 2.50" behind the normal pace

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)
74.0°F
Average temperature
26th-warmest of 133
+2.9°
vs. average
Normal: 71.1°F (1991–2020)
1.47"
Precipitation
42nd-wettest of 152
+0.27"
vs. average
Normal: 1.20" · 123% of normal

Average Temperature by Year — Sep 1 – Sep 10

1893–2026 · 2026 highlighted

Precipitation by Year — Sep 1 – Sep 10

1866–2026 · 2026 highlighted · trend +0.01" per decade (wetter since 1866)

Warmest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1898 79.9°F
2 1961 79.8°F
3 1959 78.6°F
4 1983 78.0°F
5 2015 77.4°F
6 1900 77.4°F
7 1929 77.1°F
8 1985 76.9°F
9 2023 76.6°F
10 2016 76.5°F

Coolest Sep 1 – Sep 10 on Record

# Year Avg Temp
1 1986 63.3°F
2 1994 63.4°F
3 1984 63.5°F
4 1917 63.6°F
5 1988 64.1°F
6 2017 64.4°F
7 1924 64.9°F
8 1935 65.1°F
9 1949 65.3°F
10 1928 65.4°F

Wettest Sep 1 – Sep 10 on Record

# Year Total
1 2021 5.92"
2 1935 5.41"
3 1929 5.38"
4 1969 5.30"
5 2011 4.73"
6 1868 4.30"
7 1926 3.98"
8 1940 3.94"
9 1934 3.79"
10 1974 3.62"

Driest Sep 1 – Sep 10 on Record

# Year Total
1 2010 0.00"
2 2007 0.00"
3 2005 0.00"
4 1994 0.00"
5 1990 0.00"
6 1989 0.00"
7 1971 0.00"
8 1964 0.00"
9 1955 0.00"
10 1914 0.00"
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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