Belvidere, NJ

New Jersey · Records since 1893–2026

☀️ 80°F
Currently in Belvidere
As of 2:30 PM EDT

Records for September 11

🔥 Record High

99°F

September 11, 1931

+21° from 78° normal

❄ Record Low

33°F

September 11, 1917

-21° from 54° normal
🌞 Normal high: 78°F 🌑 Normal low: 54°F 1991–2020 normals

All-Time Records — Belvidere

🔥
106°F
Hottest Day Ever
Jul 9, 1936
❄
-20°F
Coldest Day Ever
Jan 22, 1961
🌧
7.47"
Wettest Day Ever
Sep 17, 1999
☃
23.0"
Most Snow in One Day
Jan 25, 1905

First & Last Dates — Belvidere

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)
203 days
Longest growing season
1973
121 days
Shortest growing season
1963
168 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 99°F September 11, 1931
2 98°F September 11, 1983
3 96°F September 11, 1897
4 96°F September 11, 1895
5 95°F September 11, 1896
6 94°F September 11, 2016
7 93°F September 11, 2002
8 90°F September 11, 1989
9 90°F September 11, 1964
10 90°F September 11, 1952

Top 5 Record Lows — September 11

# Temp Date
🥶 33°F September 11, 1917
2 38°F September 11, 1924
3 40°F September 11, 1995
4 40°F September 11, 1923
5 41°F September 11, 1967
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 1893–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Belvidere

threshold: 91°F (90th percentile of historical Jun–Aug highs)
4.3
Avg heat wave length
days (historical)
96°
Avg peak temp
during heat waves
9
Dangerous nights 2026
Overnights ≥ 70°F
2
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
14
2026 so far
17
Avg/year 1970–2025
16
Avg/year (last 10 complete)
50
Most in a year (1955)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Belvidere

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jun 25, 1901 – Jul 6, 1901 12 102°F (Jul 2) 96°F 70°F
2 Jul 12, 1952 – Jul 23, 1952 12 99°F (Jul 23) 95°F 66°F
3 Jul 24, 1999 – Aug 3, 1999 11 98°F (Jul 24) 96°F 65°F
4 Aug 11, 2002 – Aug 21, 2002 11 98°F (Aug 14) 94°F 66°F
5 Aug 27, 1953 – Sep 5, 1953 10 104°F (Sep 2) 99°F 66°F
6 Jul 14, 1955 – Jul 23, 1955 10 104°F (Jul 22) 97°F 66°F
7 Jul 2, 1955 – Jul 11, 1955 10 101°F (Jul 5) 95°F 66°F
8 Jun 19, 1943 – Jun 28, 1943 10 100°F (Jun 25) 95°F 66°F
9 Aug 4, 1896 – Aug 13, 1896 10 99°F (Aug 6) 96°F 69°F
10 Jul 3, 1912 – Jul 12, 1912 10 98°F (Jul 9) 94°F 66°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

41
2026 total
above-normal nights
43.9
Avg / summer
1970–2020
73
Most in a summer
1906

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended -0.08" per decade, about -1.0" 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 Belvidere is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

126 of 240 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

32.69"
2026 YTD
Normal: 32.76"
-0.07"
1.24"
September so far
September normal: 4.63"
-3.39"
9
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Belvidere is 0.07" behind 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)
71.9°F
Average temperature
41st-warmest of 121
+0.7°
vs. average
Normal: 71.1°F (1991–2020)

Average Temperature by Year — Jun 1 – Aug 31

1894–2026 · 2026 highlighted · trend -0.05° per decade (cooling since 1894)

Precipitation by Year — Jun 1 – Aug 31

1894–2024 · 2026 highlighted · trend -0.06" per decade (drier since 1894)

Warmest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1949 75.9°F
2 1955 75.3°F
3 1943 74.8°F
4 1935 74.5°F
5 1931 74.1°F
6 1900 74.0°F
7 1944 74.0°F
8 1933 74.0°F
9 2002 74.0°F
10 1936 73.7°F

Coolest Jun 1 – Aug 31 on Record

# Year Avg Temp
1 1965 67.2°F
2 1992 67.3°F
3 1982 67.4°F
4 1964 67.5°F
5 1963 67.9°F
6 1985 68.3°F
7 1972 68.4°F
8 1979 68.5°F
9 2000 68.6°F
10 1977 68.7°F
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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