September
September · August · June
82climate match
United States · 1991–2020
Best time to visit
Rock River Mobile Home Park.
September leads for comfortable weather in Rock River Mobile Home Park: typically 23.8°C by day, 11.6°C at night, with 86 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.8°C
Typical low11.6°C
Rain in September86 mm
July
July · August · June
70climate match
May
May · September · October
74climate match
The weakest month is January, scoring 5 against September’s 82 — days reach only -2.4°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
5-2.4° / -11.2°
Feb
5-1.2° / -10.8°
Mar
56.4° / -4°
Apr
2713.8° / 2.3°
May
6020.6° / 8.9°
Jun
7126.4° / 14.9°
Jul
6628.5° / 17.2°
Aug
7327.3° / 16.1°
Sep
8223.8° / 11.6°
Oct
4315.9° / 5°
Nov
107.9° / -1.6°
Dec
50.3° / -7.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.4°C | -11.2°C | 45 mm | 7 | 9 h 20 | 5 | Good coverage |
| February | -1.2°C | -10.8°C | 43 mm | 7.1 | 10 h 27 | 5 | Good coverage |
| March | 6.4°C | -4°C | 59 mm | 7.1 | 11 h 47 | 5 | Good coverage |
| April | 13.8°C | 2.3°C | 106 mm | 10.1 | 13 h 20 | 27 | Good coverage |
| May | 20.6°C | 8.9°C | 111 mm | 10.8 | 14 h 38 | 60 | Good coverage |
| June | 26.4°C | 14.9°C | 140 mm | 9.4 | 15 h 21 | 71 | Good coverage |
| July | 28.5°C | 17.2°C | 113 mm | 7.1 | 15 h 04 | 66 | Good coverage |
| August | 27.3°C | 16.1°C | 105 mm | 7.7 | 13 h 56 | 73 | Good coverage |
| September | 23.8°C | 11.6°C | 86 mm | 7.8 | 12 h 26 | 82 | Good coverage |
| October | 15.9°C | 5°C | 85 mm | 8.7 | 10 h 57 | 43 | Good coverage |
| November | 7.9°C | -1.6°C | 58 mm | 6.8 | 9 h 39 | 10 | Good coverage |
| December | 0.3°C | -7.7°C | 58 mm | 8.3 | 9 h 01 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 14.4°C30 Jan 2013 | -34.4°C31 Jan 2019 | 30 mm29 Jan 2006 | 92 mm2005 · driest 3 mm in 2025 | 22 |
| February | 21.7°C23 Feb 2017 | -33.9°C1 Feb 2019 | 35 mm27 Feb 2023 | 89 mm2023 · driest 12 mm in 2026 | 22 |
| March | 28.3°C22 Mar 2012 | -22.8°C1 Mar 2015 | 56 mm25 Mar 2009 | 148 mm2009 · driest 16 mm in 2015 | 22 |
| April | 29.4°C30 Apr 2007 | -8.9°C8 Apr 2018 | 58 mm14 Apr 2014 | 193 mm2026 · driest 32 mm in 2021 | 22 |
| May | 35.0°C28 May 2018 | -5.0°C9 May 2020 | 90 mm13 May 2014 | 199 mm2018 · driest 20 mm in 2026 | 22 |
| June | 36.1°C25 Jun 2005 | 5.0°C1 Jun 2015 | 88 mm16 Jun 2022 | 269 mm2010 · driest 9 mm in 2012 | 22 |
| July | 40.6°C6 Jul 2012 | 9.4°C2 Jul 2015 | 110 mm23 Jul 2010 | 229 mm2010 · driest 27 mm in 2021 | 22 |
| August | 38.9°C2 Aug 2006 | 6.1°C31 Aug 2009 | 108 mm19 Aug 2007 | 322 mm2007 · driest 30 mm in 2008 | 21 |
| September | 35.0°C11 Sep 2013 | 1.7°C30 Sep 2022 | 121 mm12 Sep 2022 | 190 mm2015 · driest 2 mm in 2017 | 22 |
| October | 31.7°C4 Oct 2025 | -4.4°C12 Oct 2009 | 72 mm2 Oct 2019 | 163 mm2006 · driest 14 mm in 2005 | 22 |
| November | 23.9°C10 Nov 2020 | -16.1°C21 Nov 2014 | 50 mm5 Nov 2022 | 122 mm2015 · driest 9 mm in 2007 | 22 |
| December | 18.9°C4 Dec 2012 | -25.0°C25 Dec 2013 | 40 mm14 Dec 2015 | 132 mm2015 · driest 18 mm in 2017 | 22 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | 1 | 7 |
| February | 0 | 0 | 27 | 1 | 7 |
| March | <1 | 0 | 24 | 2 | 2 |
| April | 2 | 0 | 9 | 3 | <1 |
| May | 8 | 2 | <1 | 4 | 0 |
| June | 20 | 7 | 0 | 4 | 0 |
| July | 27 | 11 | 0 | 3 | 0 |
| August | 24 | 7 | 0 | 3 | 0 |
| September | 13 | 3 | 0 | 3 | 0 |
| October | 3 | <1 | 5 | 3 | <1 |
| November | 0 | 0 | 19 | 2 | 1 |
| December | 0 | 0 | 28 | 2 | 6 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 23% | 4% | 23% | -5.1–0.3°C |
| February | <1% | 22% | 4% | 23% | -5.6–3.1°C |
| March | 3% | 24% | 7% | 30% | 3.6–9.9°C |
| April | 14% | 34% | 11% | 44% | 11.1–17.0°C |
| May | 40% | 32% | 11% | 41% | 18.6–23.5°C |
| June | 65% | 32% | 14% | 37% | 24.9–28.1°C |
| July | 75% | 24% | 10% | 25% | 26.8–30.0°C |
| August | 75% | 24% | 12% | 23% | 26.0–28.3°C |
| September | 62% | 25% | 9% | 30% | 21.5–25.7°C |
| October | 22% | 27% | 8% | 32% | 13.2–19.4°C |
| November | 4% | 22% | 6% | 23% | 3.1–11.2°C |
| December | 0% | 25% | 5% | 25% | -3.2–4.3°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 7232547
- NOAA station
- USC00474108 · JEFFERSON WWTP
- Station distance
- 7.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 15 usable years
- Daylight
- Calculated from latitude 43.06°, 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.