Portage Glacier climate by month
Averages and records for each calendar month at Portage Glacier, United States, from 1998 to 2026. The warmest month is July, averaging 16.6°C; the coolest is January at −1.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −1.9°C | −8.4°C | 12.8°C27 January 2014 | −34.4°C3 January 2026 | 28 / 28 |
| February | −0.4°C | −7.0°C | 10.6°C3 February 2020 | −35.6°C4 February 1999 | 25 / 28 |
| March | 0.9°C | −7.5°C | 13.3°C31 March 2016 | −31.1°C9 March 1999 | 26 / 28 |
| April | 5.8°C | −2.0°C | 19.4°C28 April 2005 | −22.8°C1 April 2004 | 28 / 28 |
| May | 10.9°C | 2.3°C | 24.4°C27 May 2006 | −4.3°C20 May 2013 | 28 / 28 |
| June | 15.0°C | 6.1°C | 26.1°C17 June 2013 | −1.6°C5 June 2006 | 27 / 28 |
| July | 16.6°C | 8.3°C | 28.9°C6 July 2019 | 0.0°C1 July 2008 | 28 / 28 |
| August | 15.9°C | 7.3°C | 27.8°C16 August 2019 | −1.1°C23 August 2000 | 28 / 28 |
| September | 12.1°C | 4.4°C | 20.6°C1 September 2016 | −6.0°C28 September 2010 | 27 / 28 |
| October | 6.2°C | 0.2°C | 15.6°C9 October 2006 | −17.8°C27 October 2001 | 27 / 28 |
| November | 0.3°C | −5.5°C | 10.0°C5 November 2002 | −29.3°C26 November 2006 | 27 / 28 |
| December | −1.1°C | −7.7°C | 11.7°C29 December 2020 | −29.9°C30 December 2008 | 24 / 28 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 24 to 28 years each.
See what Portage Glacier is doing right now
Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.