September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Jamestown: typically 25.2°C by day, 11.9°C at night, with 87 mm of rain. Based on measured 1991–2020 NOAA station history.
September · August · June
August · July · June
October · September · May
The weakest month is January, scoring 5 against September’s 81 — days reach only 1.5°C, 22° 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 | 1.5°C | -8°C | 68 mm | 7.3 | 9 h 37 | 5 | Strong coverage |
| February | 4.2°C | -5.8°C | 62 mm | 6.2 | 10 h 37 | 5 | Good coverage |
| March | 9.7°C | -1.3°C | 76 mm | 7.9 | 11 h 49 | 13 | Good coverage |
| April | 16.6°C | 4°C | 112 mm | 9.4 | 13 h 12 | 39 | Strong coverage |
| May | 22.3°C | 10.5°C | 123 mm | 10.6 | 14 h 21 | 67 | Strong coverage |
| June | 27.1°C | 15.6°C | 120 mm | 8.3 | 14 h 59 | 72 | Strong coverage |
| July | 28.9°C | 17.4°C | 117 mm | 7.6 | 14 h 44 | 64 | Strong coverage |
| August | 28.1°C | 16.2°C | 84 mm | 6.8 | 13 h 44 | 74 | Strong coverage |
| September | 25.2°C | 11.9°C | 87 mm | 5.3 | 12 h 24 | 81 | Strong coverage |
| October | 18.8°C | 6°C | 80 mm | 6.7 | 11 h 04 | 57 | Strong coverage |
| November | 10.6°C | 0°C | 85 mm | 7.7 | 9 h 55 | 18 | Strong coverage |
| December | 3.9°C | -4.9°C | 70 mm | 7.6 | 9 h 21 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.3°C8 Jan 2008 | -32.2°C19 Jan 1994 | 54 mm13 Jan 2013 | 219 mm2005 · driest 16 mm in 2022 | 31 |
| February | 22.8°C26 Feb 2000 | -22.8°C2 Feb 2004 | 86 mm28 Feb 2011 | 174 mm2011 · driest 7 mm in 2017 | 30 |
| March | 28.3°C22 Mar 2012 | -18.3°C4 Mar 2019 | 76 mm11 Mar 1990 | 154 mm1990 · driest 2 mm in 2024 | 28 |
| April | 29.4°C27 Apr 1990 | -9.4°C7 Apr 1994 | 112 mm19 Apr 2013 | 288 mm2013 · driest 9 mm in 2024 | 30 |
| May | 34.4°C29 May 2018 | -3.3°C9 May 2020 | 76 mm11 May 2003 | 273 mm1996 · driest 46 mm in 1992 | 31 |
| June | 38.9°C29 Jun 2012 | 2.2°C22 Jun 1992 | 94 mm4 Jun 2008 | 277 mm2010 · driest 17 mm in 2024 | 31 |
| July | 38.3°C8 Jul 2012 | 6.7°C6 Jul 2001 | 97 mm12 Jul 2017 | 255 mm2017 · driest 15 mm in 1995 | 31 |
| August | 36.1°C3 Aug 1991 | 6.1°C17 Aug 1992 | 58 mm9 Aug 2011 | 175 mm2018 · driest 5 mm in 1996 | 29 |
| September | 36.1°C14 Sep 1991 | -0.6°C24 Sep 1995 | 152 mm1 Sep 2003 | 266 mm2003 · driest 0 mm in 1995 | 31 |
| October | 31.1°C9 Oct 2007 | -5.6°C15 Oct 1993 | 81 mm7 Oct 1998 | 232 mm2001 · driest 3 mm in 2024 | 32 |
| November | 25.6°C2 Nov 1999 | -16.1°C13 Nov 2019 | 82 mm14 Nov 1993 | 214 mm1992 · driest 0 mm in 1995 | 31 |
| December | 21.1°C6 Dec 1998 | -31.1°C22 Dec 1989 | 85 mm27 Dec 2015 | 145 mm2008 · driest 3 mm in 2023 | 30 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 27 | 2 | 3 |
| February | 0 | 0 | 24 | 2 | 2 |
| March | <1 | 0 | 20 | 3 | 1 |
| April | 3 | 0 | 7 | 4 | <1 |
| May | 11 | 2 | <1 | 4 | 0 |
| June | 22 | 8 | 0 | 4 | 0 |
| July | 28 | 12 | 0 | 4 | 0 |
| August | 26 | 9 | 0 | 3 | 0 |
| September | 16 | 5 | <1 | 3 | 0 |
| October | 5 | <1 | 4 | 3 | 0 |
| November | <1 | 0 | 16 | 3 | <1 |
| December | 0 | 0 | 25 | 2 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 20% | 6% | 19% | -2.0–5.1°C |
| February | <1% | 21% | 7% | 23% | 1.1–8.1°C |
| March | 7% | 26% | 9% | 30% | 6.6–13.0°C |
| April | 21% | 32% | 12% | 43% | 14.5–19.2°C |
| May | 47% | 32% | 13% | 39% | 19.9–25.2°C |
| June | 69% | 26% | 12% | 30% | 25.6–28.6°C |
| July | 75% | 25% | 12% | 30% | 27.2–30.5°C |
| August | 77% | 21% | 9% | 18% | 26.6–29.4°C |
| September | 72% | 18% | 9% | 15% | 23.0–27.2°C |
| October | 39% | 19% | 9% | 20% | 17.6–21.1°C |
| November | 7% | 23% | 9% | 25% | 7.7–13.8°C |
| December | <1% | 22% | 6% | 24% | -0.3–6.6°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