September
September · May · June
United States · 1991–2020
September leads for comfortable weather in Heyworth: typically 25.9°C by day, 11.9°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.
September · May · June
July · August · June
October · April · May
The weakest month is January, scoring 5 against September’s 78 — days reach only 0.4°C, 24° below the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0.4°C | -9.2°C | 64 mm | 7.9 | 9 h 35 | 5 | Good coverage |
| February | 2.3°C | -8.3°C | 55 mm | 7.2 | 10 h 36 | 5 | Good coverage |
| March | 10.4°C | -1.8°C | 62 mm | 7.8 | 11 h 49 | 17 | Good coverage |
| April | 18.3°C | 4.4°C | 101 mm | 9.6 | 13 h 13 | 47 | Good coverage |
| May | 23.5°C | 10.1°C | 117 mm | 10.6 | 14 h 23 | 71 | Good coverage |
| June | 27.9°C | 15.4°C | 114 mm | 9.8 | 15 h 02 | 69 | Good coverage |
| July | 29.7°C | 17.1°C | 92 mm | 7.3 | 14 h 47 | 66 | Good coverage |
| August | 29.1°C | 16.2°C | 97 mm | 7.7 | 13 h 46 | 68 | Good coverage |
| September | 25.9°C | 11.9°C | 83 mm | 6.6 | 12 h 24 | 78 | Good coverage |
| October | 18.2°C | 5.6°C | 91 mm | 8.3 | 11 h 04 | 51 | Good coverage |
| November | 10.5°C | -0.4°C | 63 mm | 6.1 | 9 h 53 | 21 | Good coverage |
| December | 2.3°C | -6.7°C | 63 mm | 8.3 | 9 h 19 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C28 Jan 2002 | -29.4°C17 Jan 2009 | 81 mm8 Jan 2008 | 164 mm2005 · driest 22 mm in 2009 | 16 |
| February | 23.3°C25 Feb 2000 | -24.4°C12 Feb 2014 | 49 mm25 Feb 2001 | 127 mm2008 · driest 11 mm in 2006 | 16 |
| March | 28.9°C22 Mar 2012 | -21.1°C4 Mar 2014 | 34 mm23 Mar 2007 | 143 mm2007 · driest 26 mm in 2005 | 16 |
| April | 33.3°C16 Apr 2002 | -7.2°C8 Apr 2007 | 44 mm17 Apr 2006 | 176 mm2009 · driest 53 mm in 2005 | 16 |
| May | 35.0°C30 May 2006 | -2.2°C4 May 2005 | 70 mm17 May 2001 | 230 mm2013 · driest 26 mm in 2005 | 16 |
| June | 37.8°C26 Jun 2005 | 3.3°C1 Jun 2003 | 89 mm8 Jun 2015 | 283 mm2015 · driest 14 mm in 2005 | 16 |
| July | 38.9°C7 Jul 2012 | 7.2°C1 Jul 2001 | 117 mm9 Jul 2003 | 198 mm2003 · driest 13 mm in 2012 | 16 |
| August | 37.8°C21 Aug 2003 | 7.2°C12 Aug 2004 | 81 mm31 Aug 2003 | 188 mm2002 · driest 33 mm in 2013 | 16 |
| September | 37.2°C2 Sep 2011 | 1.1°C16 Sep 2007 | 71 mm14 Sep 2008 | 274 mm2008 · driest 35 mm in 2004 | 17 |
| October | 34.4°C4 Oct 2006 | -4.4°C24 Oct 1999 | 76 mm23 Oct 2009 | 262 mm2009 · driest 24 mm in 2005 | 16 |
| November | 28.3°C1 Nov 2000 | -13.9°C19 Nov 2014 | 42 mm17 Nov 2003 | 129 mm2004 · driest 6 mm in 1999 | 16 |
| December | 21.1°C4 Dec 2012 | -22.8°C24 Dec 2000 | 51 mm1 Dec 2006 | 120 mm2007 · driest 25 mm in 2014 | 16 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 29 | 2 | 6 |
| February | 0 | 0 | 26 | 2 | 5 |
| March | 1 | 0 | 21 | 2 | 2 |
| April | 6 | 1 | 6 | 4 | <1 |
| May | 15 | 4 | <1 | 4 | 0 |
| June | 24 | 10 | 0 | 3 | 0 |
| July | 28 | 16 | 0 | 3 | 0 |
| August | 28 | 14 | 0 | 3 | 0 |
| September | 18 | 7 | 0 | 3 | 0 |
| October | 6 | <1 | 4 | 3 | 0 |
| November | <1 | 0 | 17 | 2 | <1 |
| December | 0 | 0 | 27 | 2 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 26% | 5% | 24% | -4.0–4.6°C |
| February | <1% | 25% | 6% | 27% | -3.6–6.9°C |
| March | 9% | 25% | 7% | 29% | 6.1–14.1°C |
| April | 28% | 32% | 12% | 42% | 15.3–21.5°C |
| May | 51% | 34% | 13% | 47% | 21.8–25.6°C |
| June | 66% | 33% | 12% | 35% | 26.5–29.7°C |
| July | 76% | 23% | 10% | 18% | 26.4–32.6°C |
| August | 75% | 25% | 10% | 28% | 27.0–31.3°C |
| September | 71% | 22% | 9% | 24% | 23.3–28.2°C |
| October | 32% | 27% | 10% | 28% | 16.1–20.6°C |
| November | 9% | 20% | 8% | 20% | 7.3–13.8°C |
| December | 0% | 27% | 5% | 28% | -2.0–5.4°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