Allentown/Lehigh Valley Intl climate by month
Averages and records for each calendar month at Allentown/Lehigh Valley Intl, United States, from 1948 to 2026. The warmest month is July, averaging 29.5°C; the coolest is January at 2.3°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 2.3°C | −6.4°C | 22.2°C26 January 1950 | −26.1°C21 January 1994 | 79 / 79 |
| February | 4.2°C | −5.5°C | 27.2°C21 February 2018 | −22.2°C6 February 1996 | 79 / 79 |
| March | 9.6°C | −1.2°C | 30.6°C30 March 1998 | −18.3°C19 March 1967 | 79 / 79 |
| April | 16.5°C | 4.1°C | 33.9°C18 April 1976 | −8.9°C7 April 1982 | 79 / 79 |
| May | 22.1°C | 9.7°C | 36.1°C19 May 1962 | −1.7°C14 May 1996 | 79 / 79 |
| June | 27.0°C | 14.9°C | 37.8°C27 June 1966 | 3.9°C11 June 1972 | 79 / 79 |
| July | 29.5°C | 17.7°C | 40.6°C3 July 1966 | 7.8°C3 July 2001 | 79 / 79 |
| August | 28.2°C | 16.6°C | 37.8°C2 August 1955 | 5.0°C30 August 1986 | 79 / 79 |
| September | 24.3°C | 12.4°C | 37.2°C2 September 1953 | −0.6°C24 September 1963 | 78 / 79 |
| October | 18.1°C | 6.1°C | 33.9°C2 October 2019 | −6.1°C31 October 1988 | 78 / 78 |
| November | 11.3°C | 0.9°C | 27.2°C1 November 1950 | −11.7°C29 November 1955 | 78 / 78 |
| December | 4.8°C | −3.9°C | 22.2°C29 December 1984 | −22.2°C28 December 1950 | 78 / 78 |
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 78 to 79 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.