September
September · August · June
80climate match
United States · 1991–2020
Best time to visit
Danbury.
September leads for comfortable weather in Danbury: typically 24.8°C by day, 10.2°C at night, with 77 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.8°C
Typical low10.2°C
Rain in September77 mm
July
July · August · June
70climate match
September
September · October · May
73climate match
The weakest month is January, scoring 5 against September’s 80 — days reach only -1.6°C, 26° below the 24°C the score treats as ideal.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
5-1.6° / -12.2°
Feb
51.6° / -9.8°
Mar
139.1° / -3.5°
Apr
3916.3° / 2°
May
6522.2° / 8.7°
Jun
7127.8° / 14.9°
Jul
6429.5° / 16.9°
Aug
7228.3° / 15.4°
Sep
8024.8° / 10.2°
Oct
5217.5° / 3.3°
Nov
148.5° / -3.7°
Dec
51.3° / -9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -1.6°C | -12.2°C | 18 mm | 3.7 | 9 h 24 | 5 | Strong coverage |
| February | 1.6°C | -9.8°C | 23 mm | 4 | 10 h 30 | 5 | Strong coverage |
| March | 9.1°C | -3.5°C | 46 mm | 6 | 11 h 48 | 13 | Strong coverage |
| April | 16.3°C | 2°C | 87 mm | 7.9 | 13 h 18 | 39 | Strong coverage |
| May | 22.2°C | 8.7°C | 117 mm | 10.1 | 14 h 33 | 65 | Strong coverage |
| June | 27.8°C | 14.9°C | 115 mm | 9.2 | 15 h 15 | 71 | Strong coverage |
| July | 29.5°C | 16.9°C | 108 mm | 7.1 | 14 h 58 | 64 | Strong coverage |
| August | 28.3°C | 15.4°C | 103 mm | 7.2 | 13 h 53 | 72 | Strong coverage |
| September | 24.8°C | 10.2°C | 77 mm | 6.5 | 12 h 26 | 80 | Strong coverage |
| October | 17.5°C | 3.3°C | 58 mm | 6.2 | 10 h 59 | 52 | Strong coverage |
| November | 8.5°C | -3.7°C | 37 mm | 4.1 | 9 h 44 | 14 | Strong coverage |
| December | 1.3°C | -9°C | 28 mm | 4.3 | 9 h 06 | 5 | Strong coverage |
What has changed
Danbury runs +0.3°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
+0.6
Feb
-0.6
Mar
+1.3
Apr
-1.8
May
-1.4
Jun
+0.5
Jul
-0.1
Aug
-0.2
Sep
+1.6
Oct
-0.1
Nov
+1.0
Dec
+2.2
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C27 Jan 2002 | -35.6°C21 Jan 1970 | 41 mm30 Jan 1947 | 52 mm2023 · driest 0 mm in 2019 | 88 |
| February | 24.4°C27 Feb 2024 | -37.2°C16 Feb 2021 | 44 mm28 Feb 1951 | 96 mm1951 · driest 1 mm in 1996 | 87 |
| March | 33.9°C22 Mar 2026 | -31.7°C11 Mar 1948 | 51 mm28 Mar 2004 | 141 mm1987 · driest 0 mm in 1994 | 87 |
| April | 35.6°C22 Apr 1980 | -18.3°C3 Apr 1975 | 75 mm27 Apr 1986 | 216 mm1986 · driest 14 mm in 1948 | 87 |
| May | 38.3°C25 May 1967 | -5.0°C2 May 1961 | 86 mm27 May 2014 | 246 mm1959 · driest 10 mm in 1955 | 86 |
| June | 40.0°C21 Jun 1988 | 2.2°C3 Jun 1969 | 115 mm4 Jun 1940 | 323 mm1967 · driest 13 mm in 2006 | 86 |
| July | 41.1°C29 Jul 1947 | 5.6°C28 Jul 2013 | 248 mm17 Jul 1996 | 276 mm1996 · driest 11 mm in 2012 | 88 |
| August | 40.0°C23 Aug 1938 | 2.2°C20 Aug 1950 | 105 mm1 Aug 1944 | 264 mm2017 · driest 12 mm in 1947 | 87 |
| September | 40.0°C6 Sep 1939 | -5.6°C28 Sep 1942 | 85 mm12 Sep 1982 | 276 mm1938 · driest 3 mm in 2011 | 87 |
| October | 34.4°C5 Oct 1963 | -12.2°C31 Oct 1993 | 71 mm30 Oct 1979 | 166 mm2009 · driest 0 mm in 1958 | 88 |
| November | 27.2°C9 Nov 2006 | -26.7°C21 Nov 1937 | 54 mm12 Nov 2015 | 107 mm1991 · driest 0 mm in 1976 | 89 |
| December | 20.6°C16 Dec 2021 | -33.3°C23 Dec 1989 | 53 mm14 Dec 2015 | 112 mm2015 · driest 1 mm in 1954 | 87 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 3 |
| February | 0 | 0 | 25 | <1 | 4 |
| March | <1 | 0 | 23 | 1 | 2 |
| April | 3 | <1 | 11 | 3 | <1 |
| May | 11 | 3 | 1 | 4 | 0 |
| June | 24 | 11 | 0 | 4 | 0 |
| July | 28 | 14 | 0 | 3 | 0 |
| August | 25 | 10 | 0 | 3 | 0 |
| September | 16 | 5 | 1 | 3 | 0 |
| October | 5 | <1 | 10 | 2 | <1 |
| November | <1 | 0 | 22 | 1 | 1 |
| December | 0 | 0 | 29 | <1 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 10% | 1% | 5% | -5.0–3.4°C |
| February | <1% | 14% | 2% | 8% | -3.0–6.4°C |
| March | 8% | 19% | 5% | 17% | 3.7–12.6°C |
| April | 28% | 25% | 9% | 28% | 13.3–19.8°C |
| May | 53% | 29% | 11% | 35% | 20.5–25.2°C |
| June | 69% | 29% | 12% | 32% | 25.3–29.7°C |
| July | 77% | 23% | 10% | 22% | 27.5–31.7°C |
| August | 76% | 23% | 10% | 22% | 26.5–30.6°C |
| September | 67% | 21% | 8% | 19% | 21.9–27.0°C |
| October | 40% | 17% | 5% | 14% | 15.3–21.5°C |
| November | 6% | 13% | 3% | 10% | 4.8–12.0°C |
| December | 0% | 12% | 2% | 7% | -2.5–4.6°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 4853367
- NOAA station
- USC00135123 · MAPLETON NO.2
- Station distance
- 5.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 42.23°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.