May
May · September · October
United States · 1991–2020
May leads for comfortable weather in Aurora: typically 24.2°C by day, 14°C at night, with 113 mm of rain. Based on measured 1991–2020 NOAA station history.
May · September · October
August · July · June
October · April · March
The weakest month is January, scoring 11 against May’s 81 — days reach only 8.2°C, 16° 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 | 8.2°C | -1.7°C | 70 mm | 5.3 | 9 h 58 | 11 | Good coverage |
| February | 10.9°C | 0.4°C | 59 mm | 5.1 | 10 h 49 | 25 | Good coverage |
| March | 15.6°C | 4.5°C | 93 mm | 7.8 | 11 h 51 | 41 | Good coverage |
| April | 20.8°C | 9.4°C | 122 mm | 7 | 13 h 03 | 64 | Good coverage |
| May | 24.2°C | 14°C | 113 mm | 8.7 | 14 h 03 | 81 | Good coverage |
| June | 28.5°C | 18.2°C | 114 mm | 7.8 | 14 h 35 | 64 | Good coverage |
| July | 31.5°C | 20.7°C | 89 mm | 6.4 | 14 h 23 | 54 | Good coverage |
| August | 31.5°C | 20.1°C | 75 mm | 4.6 | 13 h 31 | 59 | Good coverage |
| September | 26.5°C | 15.6°C | 105 mm | 6.1 | 12 h 22 | 78 | Good coverage |
| October | 21°C | 10.4°C | 91 mm | 6.4 | 11 h 13 | 71 | Good coverage |
| November | 14.5°C | 4.6°C | 113 mm | 6.9 | 10 h 13 | 35 | Good coverage |
| December | 9.1°C | -0.4°C | 74 mm | 6.2 | 9 h 43 | 15 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 24.4°C20 Jan 1986 | -27.8°C20 Jan 1985 | 83 mm18 Jan 1996 | 173 mm1998 · driest 6 mm in 2003 | 29 |
| February | 30.0°C22 Feb 1996 | -20.6°C3 Feb 1996 | 69 mm23 Feb 1985 | 180 mm1989 · driest 9 mm in 1996 | 28 |
| March | 30.0°C22 Mar 1995 | -17.8°C3 Mar 2002 | 154 mm19 Mar 2008 | 276 mm2008 · driest 9 mm in 2007 | 29 |
| April | 33.3°C17 Apr 2006 | -5.6°C7 Apr 2007 | 121 mm10 Apr 2008 | 370 mm2011 · driest 6 mm in 1989 | 29 |
| May | 33.3°C29 May 2012 | 1.1°C3 May 2011 | 79 mm3 May 1990 | 293 mm1990 · driest 27 mm in 2012 | 30 |
| June | 38.9°C25 Jun 2012 | 6.1°C27 Jun 1985 | 66 mm29 Jun 2000 | 306 mm2000 · driest 23 mm in 2011 | 29 |
| July | 41.1°C29 Jul 1986 | 11.7°C14 Jul 1987 | 79 mm13 Jul 2010 | 183 mm2008 · driest 19 mm in 1991 | 29 |
| August | 41.7°C4 Aug 2011 | 7.2°C29 Aug 1986 | 131 mm5 Aug 1985 | 244 mm1985 · driest 0 mm in 2010 | 30 |
| September | 39.4°C4 Sep 1998 | 1.1°C30 Sep 1984 | 154 mm27 Sep 1996 | 258 mm1996 · driest 4 mm in 2004 | 30 |
| October | 31.7°C18 Oct 2005 | -8.3°C31 Oct 1993 | 123 mm9 Oct 2009 | 339 mm1984 · driest 9 mm in 2005 | 29 |
| November | 28.3°C9 Nov 2006 | -16.1°C13 Nov 1986 | 177 mm19 Nov 1985 | 311 mm1996 · driest 10 mm in 1989 | 29 |
| December | 23.3°C5 Dec 1998 | -25.0°C23 Dec 1989 | 84 mm21 Dec 1984 | 240 mm1987 · driest 13 mm in 2005 | 29 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 20 | 2 | 2 |
| February | <1 | 0 | 14 | 2 | 2 |
| March | 1 | 0 | 8 | 3 | <1 |
| April | 6 | <1 | 1 | 4 | 0 |
| May | 15 | 2 | 0 | 4 | 0 |
| June | 27 | 10 | 0 | 4 | 0 |
| July | 29 | 22 | 0 | 2 | 0 |
| August | 29 | 20 | 0 | 3 | 0 |
| September | 20 | 6 | 0 | 3 | 0 |
| October | 7 | <1 | <1 | 3 | <1 |
| November | <1 | 0 | 7 | 4 | <1 |
| December | 0 | 0 | 17 | 3 | 1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 3% | 17% | 7% | 11% | 5.4–11.9°C |
| February | 7% | 21% | 9% | 20% | 7.4–13.9°C |
| March | 25% | 27% | 12% | 27% | 12.9–17.9°C |
| April | 52% | 25% | 12% | 24% | 18.8–22.3°C |
| May | 64% | 30% | 15% | 34% | 22.4–26.3°C |
| June | 74% | 25% | 13% | 25% | 26.6–30.8°C |
| July | 80% | 20% | 8% | 14% | 29.1–34.5°C |
| August | 84% | 17% | 9% | 15% | 28.7–33.8°C |
| September | 76% | 21% | 10% | 19% | 24.7–29.7°C |
| October | 52% | 22% | 10% | 23% | 18.9–22.3°C |
| November | 20% | 23% | 13% | 20% | 11.7–17.2°C |
| December | 2% | 22% | 10% | 17% | 5.9–10.9°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