Mercury/Desert Rock climate by month
Averages and records for each calendar month at Mercury/Desert Rock, United States, from 1978 to 2026. The warmest month is July, averaging 38.0°C; the coolest is December at 13.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 13.3°C | 0.7°C | 25.0°C31 January 2003 | −10.6°C29 January 1979 | 48 / 48 |
| February | 15.4°C | 2.2°C | 28.3°C26 February 1986 | −11.7°C6 February 1989 | 48 / 48 |
| March | 19.2°C | 4.9°C | 33.3°C20 March 2026 | −5.0°C13 March 1990 | 48 / 48 |
| April | 23.5°C | 8.3°C | 35.6°C26 April 1996 | −5.0°C1 April 1999 | 48 / 48 |
| May | 28.7°C | 13.1°C | 41.1°C28 May 2003 | 0.6°C6 May 1988 | 48 / 49 |
| June | 34.8°C | 18.3°C | 45.0°C30 June 2013 | 4.4°C17 June 1995 | 49 / 49 |
| July | 38.0°C | 21.9°C | 45.6°C11 July 2021 | 10.6°C1 July 1982 | 49 / 49 |
| August | 36.8°C | 20.9°C | 44.4°C16 August 2020 | 11.1°C30 August 2010 | 49 / 49 |
| September | 32.5°C | 16.5°C | 43.3°C6 September 2022 | 3.9°C30 September 1982 | 48 / 49 |
| October | 25.6°C | 10.1°C | 39.4°C1 October 2024 | −2.1°C30 October 2019 | 47 / 48 |
| November | 17.8°C | 3.7°C | 29.4°C4 November 1988 | −7.2°C20 November 1985 | 47 / 47 |
| December | 13.0°C | 0.3°C | 23.9°C11 December 2025 | −14.4°C22 December 1990 | 47 / 48 |
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 47 to 49 years each.
See what Mercury/Desert Rock 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.