2025 By the Numbers

By Ryan Knapp

Mt. Washington from the Northwest on Jan. 6, 2026.

January 2026 started off cold with temperatures well below normal, but as we approach mid-January, temperatures have see-sawed with the summit warming and averaging above normal temperatures. Looking at the weather maps for the rest of the month, a significantly colder pattern is taking shape. While I have glanced at the weather ahead, a good portion of this shift had me looking back and examining the weather stats for 2025 at Mt. Washington. So, let’s look back at some of the stats I gathered for 2025:

Our average temperature for 2025 was 28.2°F (-2.1°C), which is 0.2°F above the 1991-2020 30-year normal for our station. Our warmest temperature in 2025 was 69°F (≈20.5°C), recorded on August 13th. Our coldest temperature in 2025 was 22°F below (-22°F/-30°C), recorded on January 30th.

In terms of total liquid precipitation, from January to December of 2025, the summit of Mt Washington received 82.15 inches, which was 9.08 inches below the 1991-2020 30-year normal for our location. From January to December of 2025, the summit received 308.3 inches of snow, which was 26.5 inches above the 1991-2020 30-year normal for our location.

In terms of winds, for 2025 our average was 37.2 mph, which was 2.3 mph above the 1991-2020 30-year normal average for our location. Our highest gust recorded for 2025 was 161 mph, which occurred on February 17th. On a personal note, that 161 mph gust is, as of this writing, my second-highest gust experienced on the summit since starting in Dec of 2005; with my highest being the 171 mph gusts that occurred on 25 February 2019. From January to December, we had 163 days with gusts of 73 mph or greater, and 55 of those days had gusts of 100 mph or greater.

As for our weather during 2025, we averaged 33% of the possible sunshine. Of the 365 available days, the summit had 14 days noted as clear or mostly clear, 70 as partly sunny, and 281 as mostly cloudy, cloudy, or obscured (fog). We had 326 days with at least some amount of fog recorded during a 24-hour period. We had 118 days with rain and 193 days with snow.

If interested in additional weather data, please check out our F-6 page, which is updated nightly, our Mount Washington Weather Archives page, our  Current Conditions Page, and our 48-Hour and Higher Summits Forecast. If you need data for research purposes, you can submit a request at mountwashington.org/research/data-request/. If you are interested in supporting the work we do at our weather station, please consider donating here.