Earliest and Latest Days of 100° F in Williamsport

This is a list of the earliest and latest days in the year with a high temperature of at least 100 °F in Williamsport, Pennsylvania history. It is based on NOAA data from the years 1895–2024.

Also see:

Earliest 100 degree day in Williamsport?

The earliest in the year that Williamsport, Pennsylvania had a high temperature of at least 100 °F is June 4 which happened in 1925.

Latest 100 degree day in Williamsport?

The latest in the year that Williamsport, Pennsylvania had a high temperature of at least 100 °F is September 12 which happened in 1931.

Earliest Days ≥ 100 °F

Date	Year	Temperature
June 4	1925	100 °F
June 5	1925	104 °F
June 6	1925	100 °F
June 17	1952	100 °F
June 20	1923	101 °F
June 24	1923	100 °F
June 25	1952	100 °F
June 25	1923	100 °F
June 26	1952	102 °F
June 29	1934	101 °F
June 29	1933	100 °F
June 30	1931	100 °F
July 1	1931	102 °F
July 3	1966	100 °F
July 4	1990	100 °F
July 4	1911	100 °F
July 5	1955	100 °F
July 6	1988	101 °F
July 7	1988	101 °F
July 8	1988	102 °F

Latest Days ≥ 100 °F

Date	Year	Temperature
September 12	1931	100 °F
September 3	1953	102 °F
September 2	1953	101 °F
September 2	1932	100 °F
September 1	1932	100 °F
August 31	1932	101 °F
August 13	1944	101 °F
August 8	1918	102 °F
August 7	1918	103 °F
August 6	1918	102 °F
August 5	1955	100 °F
August 4	1930	102 °F
August 3	1930	100 °F
July 31	1933	100 °F
July 28	1949	100 °F
July 27	2020	100 °F
July 25	1934	100 °F
July 22	2011	103 °F
July 22	1926	100 °F
July 21	2011	100 °F
July 21	1955	100 °F
July 21	1934	101 °F
July 21	1926	100 °F