Coatesville/Chester Cnty climate by month
Averages and records for each calendar month at Coatesville/Chester Cnty, United States, from 1983 to 2007. The warmest month is July, averaging 29.2°C; the coolest is January at 3.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.4°C | −5.8°C | 21.7°C29 January 2002 | −25.6°C22 January 1984 | 24 / 24 |
| February | 5.0°C | −5.2°C | 23.3°C24 February 1985 | −20.6°C6 February 1996 | 24 / 24 |
| March | 10.1°C | −1.3°C | 31.1°C30 March 1998 | −20.0°C10 March 1984 | 25 / 25 |
| April | 16.6°C | 4.0°C | 33.3°C17 April 2002 | −6.1°C5 April 1995 | 25 / 25 |
| May | 22.1°C | 9.4°C | 34.4°C20 May 1996 | −1.7°C4 May 1986 | 25 / 25 |
| June | 27.0°C | 14.6°C | 35.6°C16 June 1991 | 2.2°C3 June 1986 | 25 / 25 |
| July | 29.2°C | 17.4°C | 37.8°C16 July 1988 | 7.2°C4 July 1986 | 25 / 25 |
| August | 28.5°C | 16.7°C | 37.8°C2 August 2002 | 3.9°C30 August 1986 | 25 / 25 |
| September | 24.1°C | 12.0°C | 35.6°C11 September 1983 | 1.1°C25 September 1983 | 23 / 23 |
| October | 18.1°C | 5.9°C | 31.7°C9 October 2007 | −6.1°C31 October 1988 | 25 / 25 |
| November | 12.0°C | 0.9°C | 26.7°C3 November 2003 | −12.2°C24 November 1989 | 25 / 25 |
| December | 5.6°C | −3.8°C | 23.9°C7 December 1998 | −19.4°C25 December 1983 | 25 / 25 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 23 to 25 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.