Weather on April 20
Boise, ID
55 Years of Data
Avg High
64°F
Avg Low
39°F
Warmest
1994
69°F avg
Coldest
1985
31°F avg
About This Date
April 20th in Boise, ID typically brings mild spring weather, with average highs around 64°F and lows near 39°F — a 25°F daily swing. Over 55 years of records, the warmest April 20th was in 1994 (69°F average), while the coldest was 1985 (31°F) — a 38°F range across recorded history. Rain or other precipitation has occurred on about 33% of April 20th dates historically, with the wettest April 20th recording 2.03" of rain. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for April 20th in Boise, ID? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 37° | 51° | 0.03" | — |
| 2024 | 72° | 38° | 55° | — | — |
| 2023 | 52° | 28° | 40° | — | — |
| 2022 | 65° | 39° | 52° | — | — |
| 2021 | 61° | 34° | 47° | — | — |
| 2020 | 71° | 42° | 57° | — | — |
| 2019 | 68° | 49° | 58° | 0.56" | — |
| 2018 | 69° | 40° | 54° | — | — |
| 2017 | 56° | 41° | 48° | 0.3" | — |
| 2016 | 82° | 48° | 65° | — | — |
| 2015 | 73° | 40° | 56° | — | — |
| 2014 | 64° | 42° | 53° | — | — |
| 2013 | 61° | 42° | 51° | 0.03" | — |
| 2012 | 76° | 53° | 64° | — | — |
| 2011 | 54° | 37° | 45° | 0.13" | — |
| 2010 | 83° | 49° | 66° | 2.03" | — |
| 2009 | 83° | 46° | 64° | — | — |
| 2008 | 44° | 28° | 36° | — | — |
| 2007 | 59° | 38° | 48° | — | — |
| 2006 | 72° | 42° | 57° | — | — |
| 2005 | 52° | 41° | 46° | 0.2" | — |
| 2004 | 58° | 38° | 48° | 0.23" | — |
| 2003 | 73° | 44° | 59° | — | — |
| 2002 | 61° | 32° | 46° | — | — |
| 2001 | 54° | 42° | 48° | — | — |
| 2000 | 71° | 48° | 60° | 0.33" | — |
| 1999 | 62° | 44° | 53° | — | — |
| 1998 | 69° | 38° | 53° | — | — |
| 1997 | 58° | 43° | 50° | 0.28" | — |
| 1996 | 51° | 32° | 42° | — | — |
| 1995 | 45° | 35° | 40° | 0.23" | — |
| 1994warmest | 89° | 48° | 69° | — | — |
| 1993 | 65° | 32° | 48° | — | — |
| 1992 | 75° | 42° | 59° | — | — |
| 1991 | 65° | 45° | 55° | — | — |
| 1990 | 73° | 48° | 61° | 0.1" | — |
| 1989 | 82° | 47° | 64° | — | — |
| 1988 | 60° | 47° | 53° | 2.01" | — |
| 1987 | 64° | 24° | 44° | — | — |
| 1986 | 75° | 39° | 57° | — | — |
| 1985coldest | 42° | 20° | 31° | — | — |
| 1984 | 54° | 38° | 46° | — | — |
| 1983 | 67° | 47° | 57° | 0.51" | — |
| 1982 | 54° | 23° | 38° | — | — |
| 1981 | 57° | 48° | 53° | 1.98" | — |
| 1980 | 81° | 47° | 64° | — | — |
| 1979 | 63° | 37° | 50° | — | — |
| 1978 | 57° | 37° | 47° | 0.25" | — |
| 1977 | 68° | 31° | 49° | — | — |
| 1976 | 61° | 42° | 51° | 0.18" | — |
| 1975 | 57° | 30° | 44° | — | — |
| 1974 | 59° | 37° | 48° | — | — |
| 1973 | 58° | 34° | 46° | — | — |
| 1972 | 61° | 33° | 47° | — | — |
| 1971 | 64° | 38° | 51° | 0.1" | — |
55 years of data from BOISE AIR TERMINAL