September
September · June · August
United States · 1991–2020
September leads for comfortable weather in Lincoln Park: typically 24.1°C by day, 7.1°C at night, with 125 mm of rain. Based on measured 1991–2020 NOAA station history.
September · June · August
July · August · June
May · September · June
The weakest month is January, scoring 5 against September’s 67 — days reach only 2.4°C, 22° below the 24°C the score treats as ideal, and nights drop to -12.8°C.
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 | 2.4°C | -12.8°C | 102 mm | 9.3 | 9 h 26 | 5 | Good coverage |
| February | 3.7°C | -11.3°C | 65 mm | 6.1 | 10 h 31 | 5 | Good coverage |
| March | 9°C | -6.6°C | 104 mm | 9.3 | 11 h 48 | 5 | Good coverage |
| April | 16.3°C | -1.1°C | 99 mm | 8.6 | 13 h 17 | 31 | Good coverage |
| May | 22.1°C | 4.8°C | 94 mm | 10.5 | 14 h 32 | 60 | Good coverage |
| June | 27.1°C | 10.4°C | 115 mm | 10.3 | 15 h 13 | 64 | Good coverage |
| July | 29.5°C | 12.5°C | 115 mm | 8.5 | 14 h 57 | 61 | Good coverage |
| August | 28.5°C | 12.1°C | 124 mm | 9.6 | 13 h 52 | 62 | Good coverage |
| September | 24.1°C | 7.1°C | 125 mm | 9.1 | 12 h 26 | 67 | Good coverage |
| October | 17.4°C | 0.6°C | 133 mm | 8.8 | 11 h | 33 | Good coverage |
| November | 11.5°C | -3.5°C | 97 mm | 8 | 9 h 45 | 12 | Good coverage |
| December | 4.9°C | -8.8°C | 134 mm | 9.4 | 9 h 08 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C7 Jan 2007 | -36.1°C21 Jan 1994 | 64 mm6 Jan 2001 | 212 mm1996 · driest 13 mm in 2002 | 22 |
| February | 20.0°C23 Feb 1997 | -31.7°C7 Feb 1995 | 51 mm28 Feb 2008 | 285 mm2008 · driest 12 mm in 2010 | 21 |
| March | 30.6°C31 Mar 1998 | -25.6°C7 Mar 2003 | 83 mm28 Mar 2001 | 180 mm2008 · driest 44 mm in 2012 | 21 |
| April | 35.0°C18 Apr 2002 | -15.0°C5 Apr 2006 | 158 mm16 Apr 2007 | 246 mm2007 · driest 13 mm in 2001 | 22 |
| May | 36.1°C21 May 1996 | -11.7°C3 May 2005 | 59 mm20 May 1999 | 176 mm1998 · driest 30 mm in 2007 | 21 |
| June | 37.2°C30 Jun 1991 | -1.1°C8 Jun 2006 | 93 mm10 Jun 2000 | 216 mm2006 · driest 13 mm in 1995 | 23 |
| July | 40.0°C23 Jul 2011 | -3.9°C7 Jul 2006 | 73 mm14 Jul 1996 | 315 mm1996 · driest 12 mm in 2002 | 22 |
| August | 37.8°C15 Aug 2002 | 0.0°C31 Aug 1995 | 107 mm28 Aug 2011 | 369 mm2011 · driest 40 mm in 1995 | 22 |
| September | 35.6°C3 Sep 2010 | -8.3°C12 Sep 2006 | 125 mm17 Sep 1999 | 278 mm2011 · driest 14 mm in 1990 | 23 |
| October | 30.6°C7 Oct 2007 | -16.1°C14 Oct 2006 | 165 mm9 Oct 2005 | 428 mm2005 · driest 18 mm in 2001 | 22 |
| November | 27.8°C4 Nov 1990 | -16.1°C26 Nov 1993 | 62 mm9 Nov 2006 | 197 mm2002 · driest 7 mm in 2012 | 20 |
| December | 22.2°C7 Dec 2001 | -26.1°C31 Dec 1998 | 119 mm9 Dec 2001 | 244 mm2002 · driest 50 mm in 1991 | 22 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | 4 | <1 |
| February | 0 | 0 | 26 | 2 | 1 |
| March | <1 | <1 | 25 | 4 | 1 |
| April | 3 | <1 | 17 | 3 | <1 |
| May | 9 | 3 | 7 | 3 | 0 |
| June | 20 | 8 | <1 | 4 | 0 |
| July | 26 | 13 | <1 | 3 | 0 |
| August | 26 | 11 | 0 | 4 | 0 |
| September | 13 | 3 | 3 | 4 | 0 |
| October | 2 | <1 | 15 | 4 | <1 |
| November | <1 | 0 | 18 | 3 | <1 |
| December | 0 | 0 | 26 | 4 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 30% | 12% | 36% | -1.0–5.5°C |
| February | <1% | 23% | 7% | 25% | 0.2–6.8°C |
| March | 6% | 30% | 12% | 36% | 6.3–12.2°C |
| April | 21% | 29% | 11% | 39% | 13.5–18.6°C |
| May | 50% | 34% | 11% | 46% | 20.1–24.3°C |
| June | 65% | 34% | 13% | 41% | 25.1–29.0°C |
| July | 72% | 28% | 11% | 31% | 27.1–31.7°C |
| August | 69% | 30% | 13% | 37% | 27.0–30.2°C |
| September | 62% | 30% | 13% | 38% | 22.5–25.7°C |
| October | 25% | 28% | 12% | 30% | 15.6–19.0°C |
| November | 6% | 25% | 10% | 25% | 7.7–14.0°C |
| December | <1% | 31% | 14% | 41% | 3.0–8.1°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