Copper Harbor climate by month
Averages and records for each calendar month at Copper Harbor, United States, from 1998 to 2026. The warmest month is July, averaging 23.0°C; the coolest is January at −3.2°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −3.2°C | −8.9°C | 15.0°C17 January 1999 | −22.8°C23 January 2026 | 26 / 28 |
| February | −2.7°C | −9.6°C | 13.3°C26 February 2000 | −26.6°C19 February 2015 | 27 / 28 |
| March | 1.9°C | −5.7°C | 22.8°C18 March 2012 | −29.4°C3 March 2003 | 28 / 28 |
| April | 7.0°C | −0.3°C | 25.6°C30 April 2001 | −14.4°C6 April 2003 | 28 / 28 |
| May | 14.3°C | 4.9°C | 31.1°C20 May 2009 | −3.2°C8 May 2020 | 28 / 28 |
| June | 19.5°C | 9.3°C | 33.3°C26 June 2001 | 1.1°C3 June 2002 | 28 / 28 |
| July | 23.0°C | 13.8°C | 35.6°C13 July 2026 | 6.1°C1 July 2007 | 28 / 28 |
| August | 22.5°C | 14.7°C | 33.9°C1 August 2007 | 6.7°C18 August 2007 | 29 / 29 |
| September | 19.0°C | 11.5°C | 33.9°C2 September 2022 | 0.0°C27 September 2000 | 28 / 29 |
| October | 11.8°C | 5.5°C | 31.1°C2 October 2023 | −4.3°C28 October 2013 | 28 / 28 |
| November | 5.4°C | −0.2°C | 21.1°C4 November 2008 | −13.8°C22 November 2018 | 26 / 28 |
| December | −0.4°C | −5.9°C | 12.8°C15 December 2023 | −21.1°C25 December 2004 | 28 / 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 26 to 29 years each.
See what Copper Harbor 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.