September
September · August · July
77climate match
United States · 1991–2020
Best time to visit
Heart Prairie.
September leads for comfortable weather in Heart Prairie: typically 23.2°C by day, 10.1°C at night, with 88 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.2°C
Typical low10.1°C
Rain in September88 mm
July
July · August · June
66climate match
September
September · May · October
76climate match
The weakest month is January, scoring 5 against September’s 77 — days reach only -2.5°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
5-2.5° / -11.5°
Feb
5-0.4° / -9.9°
Mar
56.3° / -4.2°
Apr
2813.6° / 1.6°
May
5820.3° / 7.9°
Jun
7325.8° / 13.5°
Jul
7427.7° / 15.6°
Aug
7526.7° / 14.3°
Sep
7723.2° / 10.1°
Oct
4315.9° / 3.9°
Nov
97.6° / -2.1°
Dec
50.6° / -7.8°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.5°C | -11.5°C | 41 mm | 6.4 | 9 h 21 | 5 | Strong coverage |
| February | -0.4°C | -9.9°C | 38 mm | 5.8 | 10 h 28 | 5 | Strong coverage |
| March | 6.3°C | -4.2°C | 47 mm | 6.4 | 11 h 47 | 5 | Strong coverage |
| April | 13.6°C | 1.6°C | 90 mm | 9.3 | 13 h 19 | 28 | Strong coverage |
| May | 20.3°C | 7.9°C | 106 mm | 10.7 | 14 h 36 | 58 | Strong coverage |
| June | 25.8°C | 13.5°C | 126 mm | 9.3 | 15 h 19 | 73 | Strong coverage |
| July | 27.7°C | 15.6°C | 96 mm | 7.5 | 15 h 02 | 74 | Strong coverage |
| August | 26.7°C | 14.3°C | 109 mm | 7.8 | 13 h 55 | 75 | Strong coverage |
| September | 23.2°C | 10.1°C | 88 mm | 7.5 | 12 h 26 | 77 | Strong coverage |
| October | 15.9°C | 3.9°C | 76 mm | 8.2 | 10 h 58 | 43 | Strong coverage |
| November | 7.6°C | -2.1°C | 57 mm | 6.2 | 9 h 41 | 9 | Strong coverage |
| December | 0.6°C | -7.8°C | 44 mm | 6.5 | 9 h 03 | 5 | Strong coverage |
What has changed
Heart Prairie 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
+0.3
Feb
-0.7
Mar
+0.3
Apr
-1.8
May
-1.3
Jun
-0.8
Jul
-1.1
Aug
-0.9
Sep
+0.3
Oct
-0.7
Nov
-0.6
Dec
+1.5
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 15.6°C25 Jan 1950 | -38.3°C30 Jan 1951 | 42 mm20 Jan 1988 | 103 mm2005 · driest 3 mm in 2025 | 77 |
| February | 21.7°C28 Feb 2024 | -32.8°C3 Feb 1996 | 43 mm9 Feb 2001 | 100 mm2008 · driest 0 mm in 1987 | 77 |
| March | 28.3°C22 Mar 2012 | -28.9°C1 Mar 1962 | 55 mm25 Mar 2009 | 144 mm2024 · driest 4 mm in 1996 | 77 |
| April | 32.2°C22 Apr 1980 | -17.8°C7 Apr 1982 | 73 mm23 Apr 1999 | 252 mm2026 · driest 21 mm in 2003 | 77 |
| May | 35.0°C28 May 2018 | -8.3°C9 May 1966 | 135 mm13 May 2014 | 227 mm2004 · driest 15 mm in 2026 | 77 |
| June | 37.8°C19 Jun 1953 | -3.3°C7 Jun 1998 | 105 mm13 Jun 1950 | 276 mm2008 · driest 4 mm in 1987 | 77 |
| July | 38.9°C7 Jul 2012 | 4.4°C1 Jul 1965 | 104 mm22 Jul 1982 | 240 mm2010 · driest 18 mm in 2026 | 77 |
| August | 38.3°C31 Aug 1953 | -0.6°C22 Aug 1997 | 125 mm11 Aug 2025 | 322 mm2007 · driest 6 mm in 1969 | 75 |
| September | 37.8°C2 Sep 1953 | -3.3°C27 Sep 1991 | 105 mm9 Sep 1985 | 278 mm1961 · driest 2 mm in 1979 | 75 |
| October | 31.7°C1 Oct 1971 | -10.6°C30 Oct 1988 | 102 mm23 Oct 1959 | 225 mm1959 · driest 3 mm in 1952 | 77 |
| November | 25.6°C1 Nov 1950 | -23.3°C25 Nov 1950 | 86 mm6 Nov 2005 | 165 mm1985 · driest 5 mm in 2007 | 76 |
| December | 18.9°C4 Dec 2012 | -31.7°C25 Dec 2000 | 48 mm15 Dec 1971 | 128 mm2015 · driest 5 mm in 1975 | 76 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 1 | 5 |
| February | 0 | 0 | 27 | 1 | 4 |
| March | <1 | 0 | 24 | 1 | 2 |
| April | 2 | <1 | 12 | 3 | <1 |
| May | 8 | 2 | 2 | 3 | 0 |
| June | 18 | 6 | <1 | 4 | 0 |
| July | 26 | 9 | 0 | 3 | 0 |
| August | 22 | 5 | 0 | 3 | 0 |
| September | 12 | 3 | <1 | 3 | 0 |
| October | 3 | <1 | 8 | 2 | <1 |
| November | 0 | 0 | 20 | 2 | <1 |
| December | 0 | 0 | 28 | 1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 18% | 3% | 14% | -5.5–1.0°C |
| February | 0% | 18% | 3% | 15% | -4.0–3.9°C |
| March | 3% | 22% | 6% | 22% | 3.4–9.8°C |
| April | 16% | 30% | 10% | 35% | 11.1–17.3°C |
| May | 43% | 31% | 9% | 37% | 18.4–24.2°C |
| June | 67% | 29% | 12% | 33% | 24.5–28.4°C |
| July | 74% | 25% | 11% | 26% | 26.5–30.5°C |
| August | 74% | 25% | 11% | 24% | 25.5–29.5°C |
| September | 60% | 24% | 9% | 28% | 21.9–25.8°C |
| October | 26% | 24% | 7% | 27% | 14.1–19.3°C |
| November | 4% | 22% | 7% | 19% | 4.5–11.2°C |
| December | 0% | 21% | 4% | 19% | -3.5–3.9°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 5255938
- NOAA station
- USC00479190 · WHITEWATER WWTP
- Station distance
- 11.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 42.77°, 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.