How extreme does Rock Springs's weather get?

The hottest, coldest, wettest and snowiest days Rock Springs has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 50+ years of daily weather observations (1971–present), from the Rock Springs Ap station 13 km away. Updated through May 2026 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Rock Springs has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

98°F Jul 13, 2002

That is about 14°F hotter than a normal July afternoon in Rock Springs (typical high near 84°F).

The three most extreme on record

1 98°F Jul 13, 2002

2 97°F Jul 17, 2023

3 96°F Jul 4, 1989

❄️ Coldest night

-29°F Dec 31, 1978

About 42°F colder than a normal December night in Rock Springs (typical low near 13°F).

The three most extreme on record

1 -29°F Dec 31, 1978

2 -29°F Feb 7, 1989

3 -29°F Dec 21, 1990

🌧️ Most rain in one day

2.00 in Sep 11, 1973

More rain in a single day than Rock Springs usually gets in the whole month of September (typical September total about 0.8 in).

The three most extreme on record

1 2.00 in Sep 11, 1973

2 1.96 in Apr 20, 1971

3 1.71 in May 30, 1971

⛄ Most snow in one day

21.8 in Feb 7, 2001

Close to a whole typical February's snow in one day (Rock Springs averages about 8 in across the month).

The three most extreme on record

1 21.8 in Feb 7, 2001

2 13.1 in Mar 10, 1988

3 10.5 in Jan 17, 1996

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Rock Springs's record heat sits well above even a hot day for the season — July's 98°F is about 14°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Rock Springs's warmest days reach the mid-80s°F and its coldest nights drop to the low 10s°F. But across the record it has gone as high as 98°F and as low as −29°F. A single day has delivered over 2 inches of rain or close to 22 inches of snow. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Rock Springs AP (NOAA GHCN station USW00024027), about 13 km from the city centre.

How we build these numbers →

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