September
September · August · June
United States · 1991–2020
September leads for comfortable weather in Hershey: typically 26°C by day, 9.4°C at night, with 41 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 3.7°C, 20° below the 24°C the score treats as ideal, and nights drop to -9.8°C.
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 | 3.7°C | -9.8°C | 6 mm | 1.4 | 9 h 31 | 5 | Strong coverage |
| February | 5.5°C | -8.7°C | 10 mm | 2.5 | 10 h 33 | 5 | Strong coverage |
| March | 11.4°C | -4.3°C | 24 mm | 3.2 | 11 h 48 | 24 | Strong coverage |
| April | 16.4°C | 0.6°C | 51 mm | 5.9 | 13 h 15 | 44 | Strong coverage |
| May | 21.8°C | 6.8°C | 79 mm | 8.4 | 14 h 28 | 67 | Strong coverage |
| June | 28.1°C | 12.8°C | 89 mm | 8.2 | 15 h 07 | 70 | Good coverage |
| July | 31.2°C | 15.8°C | 73 mm | 7.2 | 14 h 52 | 66 | Strong coverage |
| August | 30.2°C | 14.7°C | 54 mm | 5.1 | 13 h 49 | 74 | Strong coverage |
| September | 26°C | 9.4°C | 41 mm | 4.5 | 12 h 25 | 81 | Strong coverage |
| October | 18.5°C | 2°C | 47 mm | 4.2 | 11 h 02 | 56 | Strong coverage |
| November | 10.7°C | -4.6°C | 9 mm | 2 | 9 h 49 | 21 | Strong coverage |
| December | 4.6°C | -9.2°C | 8 mm | 1.5 | 9 h 13 | 5 | Strong coverage |
What has changed
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 23.3°C28 Jan 2015 | -30.6°C1 Jan 1979 | 24 mm1 Jan 1976 | 104 mm1982 · driest 0 mm in 2019 | 57 |
| February | 26.7°C3 Feb 2020 | -32.8°C16 Feb 2021 | 35 mm19 Feb 1971 | 42 mm1992 · driest 0 mm in 1996 | 59 |
| March | 33.9°C22 Mar 2026 | -26.1°C4 Mar 1978 | 60 mm14 Mar 2021 | 91 mm1992 · driest 1 mm in 2015 | 57 |
| April | 35.0°C23 Apr 1989 | -15.0°C8 Apr 2018 | 56 mm17 Apr 2016 | 127 mm1977 · driest 2 mm in 2023 | 57 |
| May | 37.8°C28 May 2006 | -5.0°C2 May 1989 | 62 mm30 May 1977 | 161 mm2018 · driest 11 mm in 2006 | 57 |
| June | 43.3°C27 Jun 1990 | -2.2°C3 Jun 1998 | 87 mm21 Jun 2011 | 258 mm2025 · driest 12 mm in 2017 | 53 |
| July | 43.3°C3 Jul 1990 | 5.6°C1 Jul 1968 | 78 mm4 Jul 1965 | 216 mm1965 · driest 16 mm in 2002 | 56 |
| August | 42.8°C1 Aug 2002 | 5.0°C28 Aug 1976 | 55 mm29 Aug 1999 | 161 mm1999 · driest 1 mm in 1975 | 57 |
| September | 40.0°C7 Sep 2013 | -5.6°C29 Sep 1984 | 56 mm7 Sep 1996 | 134 mm1965 · driest 0 mm in 1992 | 57 |
| October | 34.4°C12 Oct 2015 | -16.7°C28 Oct 2020 | 105 mm4 Oct 2016 | 158 mm2008 · driest 0 mm in 1966 | 58 |
| November | 30.0°C7 Nov 1980 | -21.7°C28 Nov 1976 | 27 mm3 Nov 1998 | 51 mm1972 · driest 0 mm in 1989 | 55 |
| December | 23.9°C18 Dec 1980 | -35.0°C22 Dec 1983 | 27 mm22 Dec 1968 | 42 mm2006 · driest 0 mm in 1988 | 58 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 31 | <1 | 3 |
| February | 0 | 0 | 27 | <1 | 3 |
| March | 1 | <1 | 25 | <1 | 2 |
| April | 4 | <1 | 13 | 2 | 2 |
| May | 11 | 3 | 2 | 3 | 0 |
| June | 23 | 11 | 0 | 3 | 0 |
| July | 28 | 19 | 0 | 3 | 0 |
| August | 28 | 17 | 0 | 2 | 0 |
| September | 18 | 9 | <1 | 1 | 0 |
| October | 7 | 2 | 10 | 1 | <1 |
| November | <1 | 0 | 26 | <1 | 2 |
| December | 0 | 0 | 30 | <1 | 3 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 6% | <1% | 1% | -1.6–7.0°C |
| February | 4% | 9% | <1% | 4% | 0.1–10.5°C |
| March | 16% | 12% | 3% | 8% | 7.3–15.7°C |
| April | 33% | 19% | 6% | 17% | 13.8–19.8°C |
| May | 52% | 27% | 9% | 31% | 19.7–24.5°C |
| June | 73% | 25% | 10% | 27% | 25.6–30.7°C |
| July | 76% | 23% | 8% | 21% | 29.4–33.4°C |
| August | 83% | 16% | 5% | 11% | 28.3–32.9°C |
| September | 75% | 15% | 5% | 12% | 23.6–28.9°C |
| October | 45% | 11% | 3% | 6% | 16.0–21.6°C |
| November | 13% | 8% | 1% | 3% | 6.3–14.1°C |
| December | 1% | 6% | <1% | 2% | 0.2–8.6°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