July is one of the warmer months of the year in Chambersburg, with average highs near 29.9°C and lows around 17.8°C (mean 23.9°C). It is a relatively wet time of year, averaging 101 mm of rainfall and 68% relative humidity across the period.
July is one of the warmer months of the year in Chambersburg. Across 45 years of records, the warmest July in Chambersburg was 2020 — when the month averaged 26.8°C — while the coldest was 1996 at 20.6°C. Typical July days reach 29.9°C with nights near 17.8°C. The long-term trend is warming, about 0.4°C per decade.
July is a relatively wet time of year in Chambersburg, averaging 101 mm of rainfall. The wettest July on record was 2018 with 254 mm, while the driest was 1983 at 29 mm.
Relative humidity in Chambersburg during July averages 68%. The most humid July was 1989 at 83%, and the least humid was 1999 at 55%.
July receives about 5.9 kWh/m²/day of solar energy in Chambersburg. The sunniest Julys were 2010 and 2011 at 6.6 kWh/m²/day, and the cloudiest was 1984 at 5.1.
Average wind speed in Chambersburg during July is 0.8 m/s. The windiest Julys were 2001, 2002 and 2007, among others at 0.9 m/s, while the calmest were 2019, 2023 and 2025, among others at 0.7 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.4°C | 23.7°C | 23.0°C | 24.4°C | 25.5°C | +2.1°C |
| Avg High | 29.7°C | 29.9°C | 29.0°C | 30.3°C | 31.7°C | +2°C |
| Avg Low | 17.2°C | 17.5°C | 17.1°C | 18.5°C | 19.3°C | +2.1°C |
| Avg Rain | 96 mm | 96 mm | 97 mm | 116 mm | 95 mm | -1 mm |
July temperatures in Chambersburg have risen by about 2.5°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8.5°C (1988) to a record high of 39.4°C (1988).
Rainfall in July is a relatively wet time of year, averaging 101 mm, with a wettest year of 254 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.3°C per decade while lows rose 0.5°C per decade, narrowing the gap between day and night.
One of the best times to visit Chambersburg
July is one of the best times to visit Chambersburg. Expect days averaging 29.9°C and nights around 17.8°C (mean 23.9°C) — warmer than Chambersburg's yearly average — with higher rainfall (101 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 31.4°C | 25.6°C | 19.8°C | 36.4°C | 15.5°C | 118 mm | 72% | 0.7 m/s | 6.2 |
| 2024 | 31.9°C | 25.7°C | 19.5°C | 37.9°C | 13.0°C | 99 mm | 64% | 0.8 m/s | 6 |
| 2023 | 31.5°C | 25.4°C | 19.3°C | 36.2°C | 15.8°C | 103 mm | 67% | 0.7 m/s | 6.2 |
| 2022 | 31.3°C | 25.1°C | 18.9°C | 36.4°C | 14.9°C | 81 mm | 65% | 0.8 m/s | 5.6 |
| 2021 | 30.5°C | 24.4°C | 18.3°C | 35.1°C | 13.0°C | 116 mm | 67% | 0.8 m/s | 6.1 |
| 2020 🔥 | 33.4°C | 26.8°C | 20.2°C | 36.5°C | 16.7°C | 56 mm | 61% | 0.8 m/s | 6.5 |
| 2019 | 30.0°C | 24.5°C | 19.0°C | 35.8°C | 13.5°C | 122 mm | 75% | 0.7 m/s | 6.4 |
| 2018 🌧️ | 28.2°C | 22.9°C | 17.6°C | 34.0°C | 12.2°C | 254 mm | 77% | 0.8 m/s | 6.1 |
| 2017 | 29.6°C | 23.9°C | 18.2°C | 34.4°C | 12.5°C | 156 mm | 72% | 0.8 m/s | 5.8 |
| 2016 | 32.0°C | 25.6°C | 19.2°C | 36.5°C | 13.3°C | 83 mm | 62% | 0.8 m/s | 6.1 |
| 2015 | 28.6°C | 23.0°C | 17.3°C | 33.3°C | 11.2°C | 82 mm | 74% | 0.8 m/s | 5.9 |
| 2014 | 28.4°C | 22.4°C | 16.5°C | 33.9°C | 10.9°C | 94 mm | 71% | 0.8 m/s | 6 |
| 2013 | 29.6°C | 24.4°C | 19.2°C | 35.5°C | 12.5°C | 83 mm | 73% | 0.8 m/s | 5.7 |
| 2012 | 31.9°C | 25.9°C | 19.8°C | 38.2°C | 16.1°C | 118 mm | 65% | 0.8 m/s | 5.8 |
| 2011 | 31.9°C | 25.6°C | 19.3°C | 38.0°C | 13.5°C | 69 mm | 65% | 0.7 m/s | 6.6 |
| 2010 | 32.4°C | 25.6°C | 18.8°C | 38.0°C | 10.8°C | 100 mm | 60% | 0.8 m/s | 6.6 |
| 2009 | 27.3°C | 21.4°C | 15.6°C | 32.2°C | 11.0°C | 106 mm | 70% | 0.8 m/s | 5.9 |
| 2008 | 29.2°C | 23.4°C | 17.6°C | 34.2°C | 12.8°C | 105 mm | 72% | 0.7 m/s | 6.3 |
| 2007 | 29.7°C | 23.2°C | 16.7°C | 35.7°C | 10.2°C | 69 mm | 61% | 0.9 m/s | 6 |
| 2006 | 29.5°C | 24.0°C | 18.5°C | 36.9°C | 12.3°C | 77 mm | 76% | 0.8 m/s | 6 |
| 2005 | 30.1°C | 24.4°C | 18.7°C | 34.9°C | 14.3°C | 152 mm | 71% | 0.7 m/s | 5.7 |
| 2004 | 27.8°C | 22.6°C | 17.4°C | 31.2°C | 14.2°C | 165 mm | 77% | 0.8 m/s | 5.3 |
| 2003 | 27.0°C | 21.9°C | 16.9°C | 29.7°C | 13.1°C | 98 mm | 81% | 0.8 m/s | 5.6 |
| 2002 | 31.8°C | 25.2°C | 18.5°C | 36.9°C | 11.4°C | 56 mm | 59% | 0.9 m/s | 5.9 |
| 2001 | 29.5°C | 22.5°C | 15.5°C | 36.2°C | 9.7°C | 44 mm | 57% | 0.9 m/s | 6.3 |
| 2000 | 27.6°C | 21.5°C | 15.4°C | 32.7°C | 10.5°C | 99 mm | 66% | 0.8 m/s | 5.2 |
| 1999 | 33.3°C | 26.1°C | 18.9°C | 39.0°C | 12.1°C | 50 mm | 55% | 0.9 m/s | 6.1 |
| 1998 | 28.5°C | 22.4°C | 16.3°C | 32.4°C | 11.3°C | 74 mm | 70% | 0.8 m/s | 6 |
| 1997 | 30.2°C | 23.4°C | 16.6°C | 35.8°C | 11.5°C | 80 mm | 60% | 0.9 m/s | 6.1 |
| 1996 ❄️ | 25.8°C | 20.6°C | 15.5°C | 29.5°C | 9.9°C | 180 mm | 81% | 0.9 m/s | 5.5 |
| 1995 | 29.8°C | 23.9°C | 18.0°C | 36.2°C | 10.0°C | 85 mm | 72% | 0.8 m/s | 5.9 |
| 1994 | 30.0°C | 24.2°C | 18.5°C | 34.2°C | 13.7°C | 125 mm | 70% | 0.7 m/s | 5.5 |
| 1993 | 30.8°C | 24.6°C | 18.3°C | 36.3°C | 13.1°C | 85 mm | 64% | 0.9 m/s | 5.7 |
| 1992 | 28.7°C | 23.1°C | 17.6°C | 34.2°C | 12.9°C | 122 mm | 72% | 0.9 m/s | 5.4 |
| 1991 | 31.8°C | 25.1°C | 18.4°C | 37.7°C | 14.2°C | 56 mm | 58% | 0.8 m/s | 5.5 |
| 1990 | 29.6°C | 23.4°C | 17.2°C | 36.0°C | 13.9°C | 104 mm | 70% | 0.9 m/s | 5.5 |
| 1989 | 26.6°C | 22.0°C | 17.4°C | 30.6°C | 12.0°C | 195 mm | 83% | 0.8 m/s | 5.3 |
| 1988 | 32.9°C | 25.8°C | 18.7°C | 39.4°C | 8.5°C | 93 mm | 58% | 0.8 m/s | 5.8 |
| 1987 | 31.7°C | 25.3°C | 19.0°C | 37.1°C | 11.0°C | 63 mm | 63% | 0.7 m/s | 6.2 |
| 1986 | 31.1°C | 24.6°C | 18.1°C | 35.6°C | 11.1°C | 91 mm | 65% | 0.9 m/s | 5.9 |
| 1985 | 29.3°C | 22.8°C | 16.3°C | 33.3°C | 11.6°C | 119 mm | 66% | 0.9 m/s | 6.1 |
| 1984 | 26.2°C | 20.8°C | 15.3°C | 30.6°C | 9.1°C | 101 mm | 78% | 0.8 m/s | 5.1 |
| 1983 | 30.5°C | 23.6°C | 16.8°C | 36.1°C | 9.5°C | 29 mm | 65% | 0.8 m/s | — |
| 1982 | 29.1°C | 22.9°C | 16.7°C | 35.3°C | 9.0°C | 74 mm | 70% | 0.8 m/s | — |
| 1981 | 29.7°C | 23.2°C | 16.7°C | 34.3°C | 10.8°C | 99 mm | 66% | 0.9 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 29.9°C with lows near 17.8°C (mean 23.9°C), based on 45 years of NASA POWER data.
July averages 101 mm of rainfall in Chambersburg, a relatively wet time of year. The wettest on record was 254 mm in 2018.
The hottest July reached 39.4°C in 1988. The coldest dipped to 8.5°C in 1988.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 2.5°C. Daytime highs moved from 29°C to 31.3°C and overnight lows from 16.4°C to 19.2°C over the same span.
July is one of the warmer months of the year in Chambersburg and a relatively wet time of year, so plan for around 29.9°C daytime highs and 17.8°C at night.
Not quite — July is the 12th coolest month in Chambersburg, averaging 23.9°C.
For July in Chambersburg, pack light layers you can adjust through the day, with typical highs of 29.9°C and lows of 17.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 68% — moderately humid.
Average wind speed in July is 0.8 m/s. The windiest July on record averaged 0.9 m/s (1981).
The wettest July on record was 2018 with 254 mm. On average, July sees 101 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Chambersburg behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
