September
September · August · June
77climate match
United States · 1991–2020
Best time to visit
Pecatonica.
September leads for comfortable weather in Pecatonica: typically 23.7°C by day, 10.6°C at night, with 104 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.7°C
Typical low10.6°C
Rain in September104 mm
July
July · August · June
68climate match
May
May · September · October
73climate match
The weakest month is January, scoring 5 against September’s 77 — days reach only -2.1°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
5-2.1° / -11.5°
Feb
50.4° / -9.6°
Mar
57.3° / -3.5°
Apr
3314.7° / 2.4°
May
6321.2° / 9.1°
Jun
7226.4° / 14.8°
Jul
6928.2° / 16.8°
Aug
7427.2° / 15.5°
Sep
7723.7° / 10.6°
Oct
4616.5° / 4.1°
Nov
107.9° / -2.1°
Dec
50.9° / -7.9°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.1°C | -11.5°C | 40 mm | 6.5 | 9 h 24 | 5 | Strong coverage |
| February | 0.4°C | -9.6°C | 42 mm | 6.1 | 10 h 30 | 5 | Strong coverage |
| March | 7.3°C | -3.5°C | 54 mm | 7.1 | 11 h 48 | 5 | Strong coverage |
| April | 14.7°C | 2.4°C | 93 mm | 8.9 | 13 h 18 | 33 | Strong coverage |
| May | 21.2°C | 9.1°C | 112 mm | 10.4 | 14 h 34 | 63 | Strong coverage |
| June | 26.4°C | 14.8°C | 134 mm | 9.9 | 15 h 15 | 72 | Strong coverage |
| July | 28.2°C | 16.8°C | 107 mm | 7.9 | 14 h 59 | 69 | Strong coverage |
| August | 27.2°C | 15.5°C | 111 mm | 7.4 | 13 h 53 | 74 | Strong coverage |
| September | 23.7°C | 10.6°C | 104 mm | 7.3 | 12 h 26 | 77 | Strong coverage |
| October | 16.5°C | 4.1°C | 76 mm | 7.3 | 10 h 59 | 46 | Strong coverage |
| November | 7.9°C | -2.1°C | 60 mm | 6.2 | 9 h 43 | 10 | Strong coverage |
| December | 0.9°C | -7.9°C | 46 mm | 6.7 | 9 h 06 | 5 | Strong coverage |
What has changed
Pecatonica runs +0.5°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
+1.2
Feb
+0.5
Mar
+1.2
Apr
-0.8
May
-0.3
Jun
+0.2
Jul
-1.1
Aug
-0.2
Sep
+1.3
Oct
+0.9
Nov
+0.2
Dec
+2.6
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 16.1°C28 Jan 2002 | -35.0°C31 Jan 2019 | 33 mm28 Jan 2006 | 95 mm2005 · driest 1 mm in 1981 | 53 |
| February | 24.4°C28 Feb 2024 | -35.0°C1 Feb 2019 | 52 mm8 Feb 2001 | 107 mm2001 · driest 1 mm in 1987 | 52 |
| March | 29.4°C30 Mar 1986 | -28.3°C1 Mar 2015 | 63 mm5 Mar 1976 | 148 mm2009 · driest 6 mm in 1994 | 53 |
| April | 33.3°C23 Apr 1980 | -12.8°C7 Apr 1982 | 95 mm16 Apr 2006 | 227 mm2026 · driest 19 mm in 1985 | 53 |
| May | 35.6°C28 May 2018 | -3.9°C2 May 2005 | 73 mm13 May 1978 | 234 mm1996 · driest 14 mm in 1992 | 53 |
| June | 37.8°C21 Jun 1988 | 3.3°C1 Jun 1993 | 121 mm3 Jun 2002 | 292 mm1993 · driest 8 mm in 1988 | 53 |
| July | 39.4°C8 Jul 2012 | 7.8°C2 Jul 2001 | 152 mm24 Jul 2010 | 342 mm2010 · driest 16 mm in 1991 | 53 |
| August | 38.3°C17 Aug 1988 | 4.4°C28 Aug 1986 | 232 mm21 Aug 2002 | 330 mm2022 · driest 20 mm in 2023 | 53 |
| September | 35.6°C9 Sep 1978 | -2.2°C23 Sep 1974 | 104 mm25 Sep 1986 | 359 mm2019 · driest 1 mm in 2017 | 53 |
| October | 32.2°C4 Oct 1997 | -9.4°C30 Oct 1988 | 59 mm5 Oct 1991 | 166 mm1984 · driest 6 mm in 1975 | 53 |
| November | 25.0°C1 Nov 2000 | -20.6°C26 Nov 1977 | 80 mm5 Nov 2022 | 157 mm1985 · driest 4 mm in 2007 | 53 |
| December | 20.6°C16 Dec 2021 | -30.6°C25 Dec 2000 | 48 mm9 Dec 2003 | 129 mm2015 · driest 8 mm in 1976 | 53 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 6 |
| February | 0 | 0 | 26 | 1 | 5 |
| March | <1 | 0 | 23 | 2 | 3 |
| April | 2 | <1 | 9 | 3 | <1 |
| May | 9 | 2 | <1 | 3 | 0 |
| June | 21 | 7 | 0 | 4 | 0 |
| July | 26 | 10 | 0 | 3 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 14 | 3 | <1 | 3 | 0 |
| October | 3 | <1 | 8 | 2 | <1 |
| November | 0 | 0 | 21 | 2 | 1 |
| December | 0 | 0 | 28 | 1 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 19% | 3% | 15% | -6.0–0.6°C |
| February | <1% | 19% | 4% | 15% | -4.6–4.9°C |
| March | 4% | 23% | 6% | 24% | 3.5–10.5°C |
| April | 17% | 29% | 11% | 35% | 11.7–18.0°C |
| May | 44% | 30% | 10% | 36% | 18.8–24.2°C |
| June | 67% | 30% | 13% | 34% | 25.1–28.0°C |
| July | 75% | 26% | 10% | 25% | 26.6–30.6°C |
| August | 74% | 25% | 10% | 25% | 25.3–29.3°C |
| September | 61% | 23% | 9% | 24% | 21.7–26.2°C |
| October | 23% | 22% | 7% | 23% | 13.9–19.3°C |
| November | 4% | 20% | 7% | 18% | 4.6–11.2°C |
| December | <1% | 21% | 5% | 19% | -3.2–4.1°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 4905572
- NOAA station
- USC00113262 · FREEPORT WWTP
- Station distance
- 20.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.31°, 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.