September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Attica: typically 25.4°C by day, 11.6°C at night, with 68 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
August · July · June
October · May · September
The weakest month is January, scoring 5 against September’s 82 — days reach only 0.5°C, 23° 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 | 0.5°C | -8.7°C | 56 mm | 6.9 | 9 h 35 | 5 | Good coverage |
| February | 3.2°C | -6.8°C | 51 mm | 6.6 | 10 h 36 | 5 | Good coverage |
| March | 9.5°C | -1.9°C | 71 mm | 7.2 | 11 h 49 | 13 | Good coverage |
| April | 16.9°C | 4.4°C | 106 mm | 9.5 | 13 h 13 | 42 | Good coverage |
| May | 22.4°C | 10.3°C | 109 mm | 10.3 | 14 h 23 | 69 | Good coverage |
| June | 27.5°C | 15.7°C | 116 mm | 9.5 | 15 h 02 | 70 | Good coverage |
| July | 28.7°C | 17.1°C | 124 mm | 8.3 | 14 h 46 | 64 | Good coverage |
| August | 28.2°C | 16.3°C | 89 mm | 7.5 | 13 h 46 | 72 | Good coverage |
| September | 25.4°C | 11.6°C | 68 mm | 6.1 | 12 h 24 | 82 | Good coverage |
| October | 18.7°C | 5.5°C | 76 mm | 6.4 | 11 h 04 | 56 | Good coverage |
| November | 10.4°C | -0.1°C | 82 mm | 8.5 | 9 h 53 | 16 | Good coverage |
| December | 2.9°C | -5.9°C | 58 mm | 7.4 | 9 h 19 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C8 Jan 2008 | -32.2°C19 Jan 1994 | 39 mm12 Jan 2005 | 175 mm2005 · driest 14 mm in 2001 | 20 |
| February | 22.8°C26 Feb 2000 | -27.2°C3 Feb 1996 | 47 mm27 Feb 1997 | 119 mm2008 · driest 9 mm in 2004 | 20 |
| March | 26.7°C28 Mar 2007 | -17.2°C4 Mar 2002 | 53 mm7 Mar 1995 | 159 mm1998 · driest 14 mm in 2001 | 20 |
| April | 30.6°C16 Apr 2002 | -9.4°C7 Apr 1994 | 109 mm12 Apr 1994 | 230 mm1994 · driest 35 mm in 1997 | 20 |
| May | 34.4°C17 May 2001 | -1.1°C17 May 2009 | 58 mm5 May 2003 | 169 mm2000 · driest 35 mm in 1992 | 19 |
| June | 35.0°C18 Jun 1992 | 3.3°C22 Jun 1992 | 102 mm11 Jun 2004 | 257 mm1998 · driest 11 mm in 1991 | 20 |
| July | 36.7°C23 Jul 1991 | 7.8°C6 Jul 2001 | 91 mm22 Jul 2005 | 323 mm1992 · driest 27 mm in 1991 | 20 |
| August | 36.7°C3 Aug 1991 | 7.2°C12 Aug 2004 | 147 mm19 Aug 2002 | 258 mm2002 · driest 15 mm in 1996 | 20 |
| September | 35.6°C14 Sep 1991 | -2.2°C23 Sep 1995 | 84 mm1 Sep 2003 | 251 mm2003 · driest 5 mm in 2009 | 20 |
| October | 32.8°C8 Oct 2007 | -6.1°C22 Oct 1997 | 65 mm14 Oct 2001 | 211 mm2001 · driest 22 mm in 2010 | 20 |
| November | 25.6°C2 Nov 2000 | -13.9°C8 Nov 1991 | 77 mm2 Nov 1992 | 192 mm1992 · driest 38 mm in 2008 | 20 |
| December | 21.1°C7 Dec 1998 | -23.9°C25 Dec 2000 | 39 mm19 Dec 2008 | 132 mm2008 · driest 25 mm in 1995 | 20 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 6 |
| February | 0 | 0 | 25 | 2 | 4 |
| March | <1 | 0 | 21 | 3 | 2 |
| April | 4 | <1 | 7 | 4 | <1 |
| May | 11 | 3 | <1 | 4 | 0 |
| June | 22 | 10 | 0 | 3 | 0 |
| July | 26 | 11 | 0 | 4 | 0 |
| August | 26 | 10 | 0 | 3 | 0 |
| September | 18 | 6 | <1 | 2 | 0 |
| October | 6 | <1 | 5 | 3 | 0 |
| November | <1 | 0 | 17 | 3 | <1 |
| December | 0 | 0 | 26 | 2 | 5 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 22% | 6% | 21% | -2.9–3.6°C |
| February | <1% | 23% | 6% | 24% | 0.0–6.4°C |
| March | 7% | 23% | 9% | 23% | 7.2–12.1°C |
| April | 23% | 32% | 12% | 43% | 14.6–19.7°C |
| May | 47% | 33% | 13% | 40% | 19.8–24.7°C |
| June | 66% | 32% | 11% | 36% | 25.8–29.3°C |
| July | 73% | 27% | 13% | 32% | 27.2–30.6°C |
| August | 76% | 24% | 8% | 24% | 26.0–30.4°C |
| September | 69% | 20% | 7% | 19% | 23.6–27.8°C |
| October | 34% | 21% | 9% | 21% | 17.1–20.7°C |
| November | 6% | 28% | 9% | 32% | 6.8–13.4°C |
| December | <1% | 24% | 6% | 24% | -0.6–6.6°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