April is one of the cooler months of the year in Great Falls, with average highs near 12.2°C and lows around -0.5°C (mean 5.9°C). It is about average for rainfall, averaging 47 mm of rainfall and 62% relative humidity across the period.
April is one of the cooler months of the year in Great Falls. Across 45 years of records, the warmest April in Great Falls was 1987 — when the month averaged 10.1°C — while the coldest was 1997 at 2.5°C. Typical April days reach 12.2°C with nights near -0.5°C. The long-term trend is cooling, about 0.2°C per decade.
April is about average for rainfall in Great Falls, averaging 47 mm of rainfall. The wettest April on record was 2017 with 79 mm, while the driest was 1983 at 15 mm.
Relative humidity in Great Falls during April averages 62%. The most humid April was 2011 at 68%, and the least humid was 1988 at 55%.
April receives about 4.8 kWh/m²/day of solar energy in Great Falls. The sunniest April was 1987 at 5.6 kWh/m²/day, and the cloudiest was 1994 at 4.2.
Average wind speed in Great Falls during April is 2.9 m/s. The windiest April was 1985 at 3.5 m/s, while the calmest was 1983 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.4°C | 5.7°C | 5.9°C | 5.9°C | 5.1°C | -1.3°C |
| Avg High | 12.9°C | 11.9°C | 12.4°C | 12.1°C | 11.2°C | -1.7°C |
| Avg Low | -0.2°C | -0.6°C | -0.6°C | -0.2°C | -1.1°C | -0.9°C |
| Avg Rain | 34 mm | 48 mm | 48 mm | 59 mm | 43 mm | +9 mm |
April temperatures in Great Falls have fallen by about 0.4°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -13.9°C (2002) to a record high of 28.8°C (2012).
Rainfall in April is about average for rainfall, averaging 47 mm, with a wettest year of 79 mm.
A good time to visit Great Falls
April is a good time to visit Great Falls, with days averaging 12.2°C and nights around -0.5°C (mean 5.9°C, cooler than Great Falls's yearly average) and moderate 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 | 13.0°C | 6.5°C | 0.0°C | 21.5°C | -7.2°C | 28 mm | 61% | 2.7 m/s | 5.1 |
| 2024 | 13.3°C | 7.2°C | 1.0°C | 22.5°C | -6.8°C | 48 mm | 62% | 2.9 m/s | 4.8 |
| 2023 | 11.1°C | 4.7°C | -1.8°C | 24.5°C | -9.8°C | 64 mm | 65% | 2.8 m/s | 4.6 |
| 2022 | 8.2°C | 2.6°C | -3.0°C | 24.3°C | -12.8°C | 38 mm | 59% | 3.2 m/s | 4.5 |
| 2021 | 11.6°C | 5.3°C | -1.0°C | 23.5°C | -6.9°C | 37 mm | 62% | 2.8 m/s | 4.6 |
| 2020 | 10.2°C | 4.2°C | -1.8°C | 24.2°C | -12.4°C | 41 mm | 64% | 3 m/s | 5.2 |
| 2019 | 11.3°C | 6.1°C | 0.8°C | 21.6°C | -5.9°C | 61 mm | 67% | 2.9 m/s | 4.3 |
| 2018 | 11.4°C | 5.0°C | -1.4°C | 25.7°C | -11.3°C | 59 mm | 66% | 2.7 m/s | 5.1 |
| 2017 🌧️ | 12.3°C | 6.2°C | 0.0°C | 20.4°C | -6.6°C | 79 mm | 67% | 2.8 m/s | 4.6 |
| 2016 | 15.5°C | 8.6°C | 1.7°C | 27.4°C | -7.2°C | 63 mm | 62% | 2.9 m/s | 4.7 |
| 2015 | 13.3°C | 6.9°C | 0.5°C | 24.3°C | -3.6°C | 28 mm | 56% | 2.6 m/s | 5.5 |
| 2014 | 12.1°C | 5.7°C | -0.7°C | 19.9°C | -7.6°C | 44 mm | 62% | 3.4 m/s | 4.8 |
| 2013 | 9.8°C | 4.0°C | -1.9°C | 21.4°C | -9.0°C | 32 mm | 62% | 3.3 m/s | 4.7 |
| 2012 | 14.6°C | 8.0°C | 1.3°C | 28.8°C | -4.4°C | 65 mm | 61% | 2.8 m/s | 4.9 |
| 2011 | 8.4°C | 3.0°C | -2.4°C | 14.7°C | -5.8°C | 76 mm | 68% | 3.1 m/s | 4.5 |
| 2010 | 11.9°C | 5.9°C | -0.2°C | 22.5°C | -4.6°C | 78 mm | 61% | 3.4 m/s | 4.8 |
| 2009 | 10.4°C | 4.3°C | -1.8°C | 24.5°C | -6.2°C | 68 mm | 67% | 2.5 m/s | 4.5 |
| 2008 | 9.8°C | 3.4°C | -3.0°C | 23.6°C | -10.3°C | 44 mm | 60% | 2.9 m/s | 5 |
| 2007 | 11.5°C | 5.4°C | -0.7°C | 23.7°C | -7.9°C | 60 mm | 66% | 2.5 m/s | 4.6 |
| 2006 | 13.9°C | 7.4°C | 1.0°C | 23.2°C | -4.1°C | 79 mm | 64% | 2.6 m/s | 4.9 |
| 2005 | 12.9°C | 6.3°C | -0.3°C | 24.4°C | -6.8°C | 42 mm | 60% | 2.9 m/s | 4.4 |
| 2004 | 14.9°C | 8.1°C | 1.2°C | 24.3°C | -5.2°C | 37 mm | 58% | 2.4 m/s | 5.4 |
| 2003 | 13.8°C | 7.3°C | 0.7°C | 23.6°C | -5.2°C | 57 mm | 62% | 2.4 m/s | 4.7 |
| 2002 | 10.4°C | 3.9°C | -2.7°C | 19.7°C | -13.9°C | 28 mm | 59% | 3 m/s | 4.6 |
| 2001 | 11.9°C | 5.7°C | -0.6°C | 25.9°C | -5.1°C | 37 mm | 60% | 3 m/s | 4.7 |
| 2000 | 14.4°C | 7.2°C | 0.1°C | 22.5°C | -8.3°C | 24 mm | 56% | 3 m/s | 5.2 |
| 1999 | 11.6°C | 5.1°C | -1.4°C | 22.7°C | -7.2°C | 35 mm | 58% | 2.7 m/s | 4.7 |
| 1998 | 13.4°C | 6.9°C | 0.3°C | 25.5°C | -3.8°C | 24 mm | 61% | 2.4 m/s | 5.2 |
| 1997 ❄️ | 8.1°C | 2.5°C | -3.2°C | 21.2°C | -12.6°C | 43 mm | 67% | 2.9 m/s | 4.7 |
| 1996 | 12.3°C | 6.1°C | -0.1°C | 24.2°C | -3.9°C | 41 mm | 66% | 3.1 m/s | 4.7 |
| 1995 | 10.3°C | 4.3°C | -1.7°C | 19.1°C | -8.4°C | 54 mm | 64% | 2.6 m/s | 4.9 |
| 1994 | 12.8°C | 6.5°C | 0.2°C | 23.7°C | -5.2°C | 65 mm | 66% | 2.6 m/s | 4.2 |
| 1993 | 11.7°C | 5.7°C | -0.3°C | 18.3°C | -4.3°C | 67 mm | 65% | 2.5 m/s | 4.8 |
| 1992 | 15.2°C | 8.4°C | 1.5°C | 27.1°C | -6.0°C | 43 mm | 57% | 2.9 m/s | 5 |
| 1991 | 10.7°C | 5.1°C | -0.6°C | 20.9°C | -6.0°C | 68 mm | 64% | 3.1 m/s | 4.8 |
| 1990 | 13.3°C | 6.5°C | -0.3°C | 23.5°C | -7.3°C | 36 mm | 65% | 2.4 m/s | 4.8 |
| 1989 | 12.5°C | 5.7°C | -1.0°C | 26.1°C | -6.8°C | 65 mm | 63% | 2.8 m/s | 4.5 |
| 1988 | 15.0°C | 7.8°C | 0.5°C | 24.8°C | -5.0°C | 29 mm | 55% | 3 m/s | 4.9 |
| 1987 🔥 | 17.6°C | 10.1°C | 2.5°C | 28.6°C | -4.3°C | 20 mm | 55% | 2.8 m/s | 5.6 |
| 1986 | 11.9°C | 5.4°C | -1.1°C | 21.1°C | -9.1°C | 53 mm | 63% | 3 m/s | 5.2 |
| 1985 | 14.0°C | 7.5°C | 1.1°C | 24.2°C | -4.6°C | 26 mm | 57% | 3.5 m/s | 5.1 |
| 1984 | 11.7°C | 5.5°C | -0.7°C | 26.8°C | -5.3°C | 44 mm | 61% | 2.9 m/s | 4.8 |
| 1983 | 11.4°C | 5.2°C | -1.1°C | 21.2°C | -5.6°C | 15 mm | 57% | 2.2 m/s | — |
| 1982 | 9.5°C | 3.4°C | -2.7°C | 22.3°C | -13.0°C | 33 mm | 61% | 3.2 m/s | — |
| 1981 | 12.9°C | 6.8°C | 0.7°C | 22.8°C | -4.1°C | 16 mm | 55% | 3.4 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 12.2°C with lows near -0.5°C (mean 5.9°C), based on 45 years of NASA POWER data.
April averages 47 mm of rainfall in Great Falls, about average for rainfall. The wettest on record was 79 mm in 2017.
The hottest April reached 28.8°C in 2012. The coldest dipped to -13.9°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have fallen by about 0.4°C. Daytime highs moved from 11.9°C to 11.4°C and overnight lows from -0.5°C to -1°C over the same span.
April is one of the cooler months of the year in Great Falls and about average for rainfall, so plan for around 12.2°C daytime highs and -0.5°C at night.
Not quite — April is the 6th coolest month in Great Falls, averaging 5.9°C.
For April in Great Falls, pack warm layers and a jacket for chilly mornings, with typical highs of 12.2°C and lows of -0.5°C.
Relative humidity in April averages 62% — moderately humid.
Average wind speed in April is 2.9 m/s. The windiest April on record averaged 3.5 m/s (1985).
The wettest April on record was 2017 with 79 mm. On average, April sees 47 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 Great Falls 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.
