Yellowstone Lake climate by month
Averages and records for each calendar month at Yellowstone Lake, United States, from 1998 to 2026. The warmest month is July, averaging 23.0°C; the coolest is January at −5.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −5.0°C | −16.9°C | 5.6°C20 January 2005 | −37.7°C12 January 2007 | 25 / 27 |
| February | −3.4°C | −17.0°C | 12.8°C10 February 2000 | −38.9°C24 February 2003 | 22 / 27 |
| March | 1.6°C | −13.0°C | 15.6°C19 March 2026 | −36.6°C10 March 2022 | 24 / 26 |
| April | 4.9°C | −8.5°C | 18.3°C29 April 2007 | −27.7°C13 April 2022 | 23 / 25 |
| May | 10.6°C | −2.8°C | 25.6°C28 May 2003 | −17.7°C7 May 2010 | 24 / 26 |
| June | 17.1°C | 0.9°C | 28.3°C29 June 2015 | −6.0°C4 June 2011 | 26 / 26 |
| July | 23.0°C | 4.2°C | 31.1°C12 July 2026 | −2.7°C12 July 2008 | 22 / 26 |
| August | 21.8°C | 3.3°C | 30.0°C1 August 2000 | −3.9°C31 August 2005 | 26 / 27 |
| September | 16.5°C | −0.4°C | 28.3°C7 September 2022 | −10.6°C24 September 2000 | 26 / 27 |
| October | 7.8°C | −5.1°C | 23.3°C2 October 2010 | −26.6°C26 October 2020 | 25 / 27 |
| November | 0.6°C | −11.0°C | 13.9°C6 November 1999 | −30.5°C25 November 2010 | 26 / 27 |
| December | −4.7°C | −15.3°C | 5.6°C6 December 2023 | −37.7°C22 December 2022 | 26 / 27 |
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 22 to 26 years each.
See what Yellowstone Lake 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.