June is one of the warmer months of the year in Johnstown, with average highs near 24.2°C and lows around 13.2°C (mean 18.7°C). It is a relatively wet time of year, averaging 102 mm of rainfall and 78% relative humidity across the period.
June is one of the warmer months of the year in Johnstown. Across 45 years of records, the warmest June in Johnstown was 2005 — when the month averaged 20.7°C — while the coldest was 1985 at 16.1°C. Typical June days reach 24.2°C with nights near 13.2°C. The long-term trend is warming, about 0.4°C per decade.
June is a relatively wet time of year in Johnstown, averaging 102 mm of rainfall. The wettest June on record was 2015 with 205 mm, while the driest was 1988 at 38 mm.
Relative humidity in Johnstown during June averages 78%. The most humid June was 1989 at 85%, and the least humid was 1999 at 64%.
June receives about 5.8 kWh/m²/day of solar energy in Johnstown. The sunniest June was 1988 at 7 kWh/m²/day, and the cloudiest was 2015 at 4.8.
Average wind speed in Johnstown during June is 0.1 m/s. The windiest Junes were 2022, 2023 and 2024, among others at 0.1 m/s, while the calmest were 2017, 2020 and 2025, among others at 0 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 17.8°C | 18.6°C | 18.8°C | 19.0°C | 19.4°C | +1.6°C |
| Avg High | 23.4°C | 24.2°C | 24.2°C | 24.3°C | 25.0°C | +1.6°C |
| Avg Low | 12.3°C | 12.9°C | 13.3°C | 13.8°C | 13.8°C | +1.5°C |
| Avg Rain | 119 mm | 86 mm | 103 mm | 112 mm | 88 mm | -30 mm |
June temperatures in Johnstown have risen by about 1.9°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 1.6°C (1990) to a record high of 34.9°C (2021).
Rainfall in June is a relatively wet time of year, averaging 102 mm, with a wettest year of 205 mm.
One of the best times to visit Johnstown
June is one of the best times to visit Johnstown. Expect days averaging 24.2°C and nights around 13.2°C (mean 18.7°C) — warmer than Johnstown's yearly average — with higher rainfall (102 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 | 25.5°C | 20.6°C | 15.7°C | 30.5°C | 3.1°C | 139 mm | 84% | 0 m/s | 5.7 |
| 2024 | 25.3°C | 19.7°C | 14.2°C | 31.7°C | 7.6°C | 64 mm | 78% | 0.1 m/s | 6.4 |
| 2023 | 24.0°C | 17.8°C | 11.6°C | 31.7°C | 6.2°C | 97 mm | 71% | 0.1 m/s | 5.5 |
| 2022 | 24.6°C | 18.8°C | 13.0°C | 30.9°C | 6.2°C | 89 mm | 76% | 0.1 m/s | 6.6 |
| 2021 | 26.2°C | 20.3°C | 14.5°C | 34.9°C | 5.7°C | 80 mm | 74% | 0.1 m/s | 6 |
| 2020 | 24.6°C | 19.1°C | 13.5°C | 32.0°C | 2.9°C | 60 mm | 78% | 0 m/s | 6.4 |
| 2019 | 23.4°C | 18.2°C | 13.1°C | 30.7°C | 4.8°C | 111 mm | 82% | 0.1 m/s | 6 |
| 2018 | 24.1°C | 19.3°C | 14.4°C | 32.1°C | 8.0°C | 136 mm | 83% | 0.1 m/s | 5.4 |
| 2017 | 23.6°C | 18.6°C | 13.7°C | 28.8°C | 8.1°C | 107 mm | 81% | 0 m/s | 6.1 |
| 2016 | 25.3°C | 19.5°C | 13.7°C | 30.3°C | 5.8°C | 71 mm | 72% | 0.1 m/s | 6.4 |
| 2015 🌧️ | 23.8°C | 19.0°C | 14.2°C | 29.9°C | 8.2°C | 205 mm | 84% | 0 m/s | 4.8 |
| 2014 | 24.5°C | 19.4°C | 14.2°C | 28.3°C | 7.2°C | 129 mm | 82% | 0 m/s | 5.8 |
| 2013 | 24.2°C | 19.1°C | 13.9°C | 30.0°C | 5.0°C | 139 mm | 80% | 0.1 m/s | 5.5 |
| 2012 | 24.3°C | 18.4°C | 12.6°C | 31.7°C | 8.0°C | 76 mm | 75% | 0.1 m/s | 6.4 |
| 2011 | 24.2°C | 19.1°C | 13.9°C | 27.7°C | 5.6°C | 61 mm | 81% | 0.1 m/s | 5.9 |
| 2010 | 25.1°C | 19.8°C | 14.6°C | 29.2°C | 6.0°C | 82 mm | 81% | 0.1 m/s | 5.8 |
| 2009 | 22.9°C | 17.9°C | 12.9°C | 26.9°C | 5.5°C | 116 mm | 82% | 0.1 m/s | 5.2 |
| 2008 | 24.4°C | 19.5°C | 14.7°C | 29.2°C | 7.4°C | 100 mm | 82% | 0 m/s | 6 |
| 2007 | 24.9°C | 18.9°C | 12.8°C | 31.4°C | 6.4°C | 96 mm | 75% | 0.1 m/s | 6.4 |
| 2006 | 23.1°C | 17.9°C | 12.6°C | 30.6°C | 3.5°C | 132 mm | 78% | 0.1 m/s | 5.6 |
| 2005 🔥 | 26.3°C | 20.7°C | 15.0°C | 34.2°C | 8.7°C | 58 mm | 76% | 0.1 m/s | 6.1 |
| 2004 | 22.9°C | 17.7°C | 12.6°C | 28.3°C | 6.2°C | 98 mm | 82% | 0 m/s | 5.8 |
| 2003 | 22.1°C | 17.1°C | 12.1°C | 29.4°C | 2.9°C | 111 mm | 83% | 0 m/s | 4.9 |
| 2002 | 24.9°C | 19.3°C | 13.7°C | 29.7°C | 7.4°C | 115 mm | 77% | 0.1 m/s | 6.1 |
| 2001 | 26.0°C | 19.4°C | 12.8°C | 32.6°C | 7.3°C | 98 mm | 70% | 0.1 m/s | 6 |
| 2000 | 24.9°C | 19.6°C | 14.2°C | 29.3°C | 6.6°C | 111 mm | 76% | 0.1 m/s | 5.2 |
| 1999 | 26.9°C | 19.9°C | 12.8°C | 33.4°C | 6.0°C | 59 mm | 64% | 0.1 m/s | 5.9 |
| 1998 | 22.4°C | 17.8°C | 13.2°C | 29.3°C | 3.7°C | 115 mm | 82% | 0.1 m/s | 5 |
| 1997 | 23.4°C | 18.0°C | 12.7°C | 29.2°C | 5.8°C | 77 mm | 79% | 0.1 m/s | 6 |
| 1996 | 24.3°C | 19.3°C | 14.3°C | 29.7°C | 5.9°C | 132 mm | 83% | 0.1 m/s | 5.6 |
| 1995 | 24.3°C | 19.1°C | 13.9°C | 30.5°C | 6.4°C | 134 mm | 80% | 0.1 m/s | 5.7 |
| 1994 | 25.2°C | 19.4°C | 13.6°C | 32.0°C | 2.9°C | 83 mm | 78% | 0.1 m/s | 6.1 |
| 1993 | 23.3°C | 17.5°C | 11.7°C | 27.7°C | 3.6°C | 69 mm | 78% | 0.1 m/s | 6.1 |
| 1992 | 23.6°C | 17.3°C | 10.9°C | 30.3°C | 5.1°C | 47 mm | 72% | 0.1 m/s | 5.8 |
| 1991 | 25.5°C | 19.4°C | 13.4°C | 31.2°C | 7.4°C | 52 mm | 72% | 0.1 m/s | 6 |
| 1990 | 23.3°C | 17.9°C | 12.5°C | 28.4°C | 1.6°C | 96 mm | 79% | 0.1 m/s | 5.4 |
| 1989 | 22.8°C | 18.4°C | 14.0°C | 27.4°C | 8.6°C | 176 mm | 85% | 0.1 m/s | 5.1 |
| 1988 | 24.8°C | 17.6°C | 10.5°C | 33.2°C | 2.0°C | 38 mm | 64% | 0.1 m/s | 7 |
| 1987 | 24.7°C | 19.3°C | 13.8°C | 28.2°C | 5.2°C | 114 mm | 79% | 0.1 m/s | 5.9 |
| 1986 | 23.5°C | 17.6°C | 11.8°C | 27.2°C | 2.0°C | 112 mm | 77% | 0.1 m/s | 6.1 |
| 1985 ❄️ | 21.7°C | 16.1°C | 10.6°C | 25.8°C | 6.7°C | 67 mm | 79% | 0 m/s | 5.9 |
| 1984 | 24.0°C | 18.4°C | 12.9°C | 27.9°C | 5.2°C | 138 mm | 81% | 0.1 m/s | 5.8 |
| 1983 | 23.6°C | 18.1°C | 12.7°C | 30.3°C | 3.7°C | 141 mm | 79% | 0.1 m/s | — |
| 1982 | 21.5°C | 16.4°C | 11.4°C | 27.4°C | 6.8°C | 134 mm | 82% | 0.1 m/s | — |
| 1981 | 24.1°C | 18.6°C | 13.1°C | 28.9°C | 5.1°C | 147 mm | 80% | 0.1 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 24.2°C with lows near 13.2°C (mean 18.7°C), based on 45 years of NASA POWER data.
June averages 102 mm of rainfall in Johnstown, a relatively wet time of year. The wettest on record was 205 mm in 2015.
The hottest June reached 34.9°C in 2021. The coldest dipped to 1.6°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have risen by about 1.9°C. Daytime highs moved from 23°C to 25.1°C and overnight lows from 12.1°C to 13.8°C over the same span.
June is one of the warmer months of the year in Johnstown and a relatively wet time of year, so plan for around 24.2°C daytime highs and 13.2°C at night.
Not quite — June is the 10th coolest month in Johnstown, averaging 18.7°C.
For June in Johnstown, pack light layers you can adjust through the day, with typical highs of 24.2°C and lows of 13.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in June averages 78% — quite humid.
Average wind speed in June is 0.1 m/s. The windiest June on record averaged 0.1 m/s (1981).
The wettest June on record was 2015 with 205 mm. On average, June sees 102 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 Johnstown behaves each June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
