Weather on May 20 at Glacier
Glacier National Park
Based on 55 years of data from Kalispell, MT
Elevation Note: Glacier sits at 4,500 ft. Expect temperatures 16°F cooler than the data shown below, which comes from Kalispell, MT at a lower elevation.
Planning Your Visit
May 20th in Glacier National Park (via Kalispell, MT) typically brings mild spring weather, with average highs around 66°F and lows near 40°F — a 26°F daily swing. Over 55 years of records, the warmest May 20th was in 1980 (65°F average), while the coldest was 1971 (42°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 42% of May 20th dates historically, with the wettest May 20th recording 1.5" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for May 20th in Glacier? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 59°F | 37°F | 0.18" | 0" |
| 2024 | 58°F | 38°F | 0.05" | 0" |
| 2023 | 84°F | 46°F | 0" | 0" |
| 2022 | 52°F | 37°F | 0.03" | 0" |
| 2021 | 51°F | 40°F | 0" | 0" |
| 2020 | 57°F | 50°F | 1.5" | 0" |
| 2019 | 53°F | 44°F | 0" | 0" |
| 2018 | 76°F | 39°F | 0" | 0" |
| 2017 | 70°F | 41°F | 0.15" | 0" |
| 2016 | 60°F | 44°F | 0.15" | 0" |
| 2015 | 76°F | 42°F | 0" | 0" |
| 2014 | 70°F | 35°F | 0" | 0" |
| 2013 | 71°F | 46°F | 0" | 0" |
| 2012 | 68°F | 31°F | 0" | 0" |
| 2011 | 67°F | 44°F | 0" | 0" |
| 2010 | 55°F | 40°F | 1.09" | 0" |
| 2009 | 58°F | 34°F | 0" | 0" |
| 2008 | 71°F | 45°F | 0.94" | 0" |
| 2007 | 60°F | 36°F | 0" | 0" |
| 2006 | 69°F | 47°F | 0.2" | 0" |
| 2005 | 58°F | 32°F | 0.23" | 0" |
| 2004 | 68°F | 49°F | 0.05" | -- |
| 2003 | 62°F | 30°F | 0" | -- |
| 2002 | 74°F | 51°F | 0" | -- |
| 2001 | 62°F | 28°F | 0" | -- |
| 2000 | 68°F | 40°F | 0" | -- |
| 1999 | 69°F | 35°F | 0" | 0" |
| 1998 | 81°F | 42°F | 0" | 0" |
| 1997 | 68°F | 41°F | 0" | 0" |
| 1996 | 59°F | 35°F | 0.33" | 0" |
| 1995 | 72°F | 31°F | 0" | 0" |
| 1994 | 54°F | 44°F | 1.02" | 0" |
| 1993 | 73°F | 51°F | 0.15" | 0" |
| 1992 | 59°F | 41°F | 1.35" | 0" |
| 1991 | 72°F | 37°F | 0" | 0" |
| 1990 | 56°F | 37°F | 0.38" | 0" |
| 1989 | 64°F | 38°F | 0" | 0" |
| 1988 | 69°F | 34°F | 0" | 0" |
| 1987 | 51°F | 42°F | 0" | 0" |
| 1986 | 74°F | 48°F | 0.08" | 0" |
| 1985 | 79°F | 42°F | 0" | 0" |
| 1984 | 59°F | 40°F | 0" | 0" |
| 1983 | 74°F | 31°F | 0" | 0" |
| 1982 | 68°F | 29°F | 0" | 0" |
| 1981 | 76°F | 49°F | 0.1" | 0" |
| 1980 | 78°F | 52°F | 0" | 0" |
| 1979 | 72°F | 33°F | 0" | 0" |
| 1978 | 73°F | 40°F | 0" | 0" |
| 1977 | 64°F | 39°F | 0.2" | 0" |
| 1976 | 74°F | 43°F | 0.36" | 0" |
| 1975 | 57°F | 32°F | 0.58" | 0" |
| 1974 | 62°F | 41°F | 0" | -- |
| 1973 | 77°F | 49°F | 0" | -- |
| 1972 | 69°F | 52°F | 0.1" | -- |
| 1971 | 47°F | 38°F | 0.66" | -- |