April is one of the cooler months of the year in Johnstown, with average highs near 14.2°C and lows around 2.2°C (mean 8.2°C). It is about average for rainfall, averaging 90 mm of rainfall and 79% relative humidity across the period.
April is one of the cooler months of the year in Johnstown. Across 45 years of records, the warmest April in Johnstown was 2017 — when the month averaged 11.7°C — while the coldest was 2018 at 5.1°C. Typical April days reach 14.2°C with nights near 2.2°C. The long-term trend is warming, about 0.4°C per decade.
April is about average for rainfall in Johnstown, averaging 90 mm of rainfall. The wettest April on record was 2024 with 198 mm, while the driest was 1985 at 32 mm.
Relative humidity in Johnstown during April averages 79%. The most humid April was 2011 at 87%, and the least humid was 2023 at 75%.
April receives about 4.6 kWh/m²/day of solar energy in Johnstown. The sunniest Aprils were 1997, 2006 and 2010, among others at 5.2 kWh/m²/day, and the cloudiest was 2011 at 3.6.
Average wind speed in Johnstown during April is 0.2 m/s. The windiest April was 1982 at 0.3 m/s, while the calmest were 2023, 2024 and 2025, among others at 0.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.4°C | 7.7°C | 8.6°C | 8.6°C | 8.8°C | +1.4°C |
| Avg High | 13.3°C | 13.7°C | 14.7°C | 14.7°C | 14.7°C | +1.4°C |
| Avg Low | 1.5°C | 1.8°C | 2.5°C | 2.6°C | 2.8°C | +1.3°C |
| Avg Rain | 84 mm | 93 mm | 87 mm | 87 mm | 106 mm | +22 mm |
April temperatures in Johnstown have risen by about 1.8°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -12.5°C (1982) to a record high of 27.7°C (2023).
Rainfall in April is about average for rainfall, averaging 90 mm, with a wettest year of 198 mm.
A good time to visit Johnstown
April is a good time to visit Johnstown, with days averaging 14.2°C and nights around 2.2°C (mean 8.2°C, close to Johnstown's yearly average) and higher rainfall. July and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.6°C | 9.6°C | 3.5°C | 25.5°C | -5.9°C | 111 mm | 77% | 0.2 m/s | 4.4 |
| 2024 🌧️ | 15.8°C | 10.2°C | 4.6°C | 25.5°C | -3.1°C | 198 mm | 83% | 0.2 m/s | 4.3 |
| 2023 | 16.7°C | 10.1°C | 3.4°C | 27.7°C | -4.9°C | 73 mm | 75% | 0.2 m/s | 4.6 |
| 2022 | 13.1°C | 7.3°C | 1.5°C | 26.8°C | -4.4°C | 76 mm | 78% | 0.2 m/s | 4.4 |
| 2021 | 14.8°C | 8.8°C | 2.8°C | 24.6°C | -7.0°C | 53 mm | 76% | 0.2 m/s | 4.6 |
| 2020 | 11.9°C | 6.5°C | 1.1°C | 20.7°C | -4.7°C | 127 mm | 79% | 0.2 m/s | 4.3 |
| 2019 | 15.3°C | 9.5°C | 3.8°C | 22.6°C | -5.1°C | 100 mm | 82% | 0.2 m/s | 4.3 |
| 2018 ❄️ | 10.5°C | 5.1°C | -0.3°C | 24.2°C | -5.6°C | 103 mm | 80% | 0.2 m/s | 4.4 |
| 2017 🔥 | 17.9°C | 11.7°C | 5.6°C | 26.1°C | -3.9°C | 71 mm | 80% | 0.2 m/s | 4.7 |
| 2016 | 14.0°C | 7.7°C | 1.5°C | 24.1°C | -7.2°C | 53 mm | 75% | 0.2 m/s | 4.8 |
| 2015 | 14.7°C | 8.5°C | 2.3°C | 23.2°C | -4.1°C | 107 mm | 78% | 0.2 m/s | 4.7 |
| 2014 | 14.3°C | 7.8°C | 1.2°C | 23.3°C | -6.8°C | 87 mm | 78% | 0.2 m/s | 4.5 |
| 2013 | 14.5°C | 8.6°C | 2.7°C | 22.3°C | -6.2°C | 62 mm | 79% | 0.2 m/s | 4.8 |
| 2012 | 14.1°C | 7.8°C | 1.4°C | 25.6°C | -4.3°C | 47 mm | 76% | 0.2 m/s | 5.1 |
| 2011 | 14.2°C | 9.0°C | 3.7°C | 24.0°C | -3.4°C | 190 mm | 87% | 0.2 m/s | 3.6 |
| 2010 | 17.4°C | 10.6°C | 3.9°C | 27.2°C | -1.4°C | 54 mm | 76% | 0.2 m/s | 5.2 |
| 2009 | 14.1°C | 8.1°C | 2.2°C | 27.3°C | -4.7°C | 82 mm | 80% | 0.2 m/s | 4.6 |
| 2008 | 15.9°C | 9.8°C | 3.7°C | 24.6°C | -4.7°C | 86 mm | 81% | 0.2 m/s | 4.6 |
| 2007 | 11.4°C | 6.3°C | 1.3°C | 22.9°C | -6.1°C | 97 mm | 81% | 0.2 m/s | 4 |
| 2006 | 16.5°C | 9.6°C | 2.8°C | 24.8°C | -5.3°C | 80 mm | 75% | 0.2 m/s | 5.2 |
| 2005 | 14.7°C | 8.5°C | 2.3°C | 22.7°C | -2.2°C | 53 mm | 79% | 0.2 m/s | 5 |
| 2004 | 13.7°C | 8.4°C | 3.1°C | 23.8°C | -5.9°C | 136 mm | 83% | 0.2 m/s | 4.3 |
| 2003 | 14.6°C | 8.4°C | 2.1°C | 23.5°C | -7.0°C | 62 mm | 81% | 0.2 m/s | 4.7 |
| 2002 | 15.3°C | 9.3°C | 3.2°C | 27.5°C | -5.8°C | 91 mm | 77% | 0.2 m/s | 4.6 |
| 2001 | 16.5°C | 9.5°C | 2.5°C | 25.9°C | -5.0°C | 74 mm | 77% | 0.2 m/s | 4.6 |
| 2000 | 14.3°C | 8.1°C | 1.8°C | 22.7°C | -4.8°C | 106 mm | 78% | 0.2 m/s | 4.3 |
| 1999 | 15.5°C | 8.7°C | 2.0°C | 23.2°C | -4.4°C | 116 mm | 77% | 0.2 m/s | 4.7 |
| 1998 | 14.4°C | 8.3°C | 2.2°C | 20.3°C | -4.6°C | 151 mm | 78% | 0.2 m/s | 4.9 |
| 1997 | 11.9°C | 5.9°C | -0.1°C | 20.6°C | -6.2°C | 32 mm | 76% | 0.2 m/s | 5.2 |
| 1996 | 12.8°C | 6.9°C | 1.0°C | 22.6°C | -5.1°C | 96 mm | 82% | 0.2 m/s | 4.3 |
| 1995 | 12.5°C | 6.4°C | 0.3°C | 20.2°C | -7.9°C | 67 mm | 77% | 0.2 m/s | 4.1 |
| 1994 | 15.8°C | 9.1°C | 2.5°C | 24.7°C | -5.7°C | 87 mm | 81% | 0.2 m/s | 5.2 |
| 1993 | 12.9°C | 7.0°C | 1.0°C | 22.2°C | -5.2°C | 171 mm | 82% | 0.2 m/s | 4.1 |
| 1992 | 13.1°C | 7.6°C | 2.1°C | 20.1°C | -6.6°C | 57 mm | 80% | 0.2 m/s | 4.3 |
| 1991 | 14.7°C | 9.3°C | 4.0°C | 23.7°C | -5.0°C | 83 mm | 84% | 0.2 m/s | 4.1 |
| 1990 | 13.8°C | 8.2°C | 2.6°C | 27.0°C | -4.9°C | 74 mm | 78% | 0.2 m/s | 4.5 |
| 1989 | 12.7°C | 6.4°C | 0.1°C | 21.5°C | -6.0°C | 36 mm | 77% | 0.2 m/s | 4.7 |
| 1988 | 13.1°C | 7.0°C | 1.0°C | 21.5°C | -4.7°C | 64 mm | 79% | 0.2 m/s | 4.7 |
| 1987 | 12.9°C | 7.7°C | 2.5°C | 24.7°C | -6.2°C | 123 mm | 84% | 0.2 m/s | 4.3 |
| 1986 | 14.1°C | 8.3°C | 2.5°C | 23.7°C | -4.5°C | 73 mm | 82% | 0.2 m/s | 4.6 |
| 1985 | 15.4°C | 9.9°C | 4.4°C | 26.2°C | -6.3°C | 32 mm | 80% | 0.2 m/s | 4.9 |
| 1984 | 12.1°C | 6.6°C | 1.1°C | 22.6°C | -5.0°C | 110 mm | 84% | 0.2 m/s | 4.2 |
| 1983 | 11.9°C | 6.7°C | 1.5°C | 23.2°C | -5.4°C | 145 mm | 82% | 0.2 m/s | — |
| 1982 | 11.9°C | 5.2°C | -1.5°C | 21.3°C | -12.5°C | 52 mm | 76% | 0.3 m/s | — |
| 1981 | 15.5°C | 8.6°C | 1.7°C | 22.8°C | -6.4°C | 121 mm | 77% | 0.2 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 14.2°C with lows near 2.2°C (mean 8.2°C), based on 45 years of NASA POWER data.
April averages 90 mm of rainfall in Johnstown, about average for rainfall. The wettest on record was 198 mm in 2024.
The hottest April reached 27.7°C in 2023. The coldest dipped to -12.5°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.8°C. Daytime highs moved from 13.4°C to 15.2°C and overnight lows from 1.4°C to 3.2°C over the same span.
April is one of the cooler months of the year in Johnstown and about average for rainfall, so plan for around 14.2°C daytime highs and 2.2°C at night.
Not quite — April is the 6th coolest month in Johnstown, averaging 8.2°C.
For April in Johnstown, pack warm layers and a jacket for chilly mornings, with typical highs of 14.2°C and lows of 2.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 79% — quite humid.
Average wind speed in April is 0.2 m/s. The windiest April on record averaged 0.3 m/s (1982).
The wettest April on record was 2024 with 198 mm. On average, April sees 90 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 April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
