How extreme does Castle Rock's weather get?

The hottest, coldest, wettest and snowiest days Castle Rock 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 Castle Rock station 2 km away. Updated through September 2025 — 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 Castle Rock has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

102°F Jul 11, 2022

That is about 16°F hotter than a normal July afternoon in Castle Rock (typical high near 86°F).

The three most extreme on record

1 102°F Jul 11, 2022recent

2 101°F Jun 16, 2021

3 101°F Sep 12, 2021

❄️ Coldest night

-29°F Feb 4, 1982

About 49°F colder than a normal February night in Castle Rock (typical low near 20°F).

The three most extreme on record

1 -29°F Feb 4, 1982

2 -26°F Dec 6, 1972

3 -26°F Dec 20, 1990

🌧️ Most rain in one day

3.55 in May 12, 2023

More rain in a single day than Castle Rock usually gets in the whole month of May (typical May total about 2.0 in).

The three most extreme on record

1 3.55 in May 12, 2023recent

2 3.50 in Jun 7, 2012

3 3.00 in Mar 19, 2003

⛄ Most snow in one day

24.0 in Dec 24, 1982

Close to a whole typical December's snow in one day (Castle Rock averages about 9 in across the month).

The three most extreme on record

1 24.0 in Dec 24, 1982

2 24.0 in Mar 19, 2003

3 18.0 in Dec 25, 1973

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

Castle Rock's record heat sits well above even a hot day for the season — July's 102°F is about 16°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, Castle Rock's warmest days reach the mid-80s°F and its coldest nights drop to the high 10s°F. But across the record it has gone as high as 102°F and as low as −29°F. A single day has delivered over 4 inches of rain or close to 24 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 Denver Centennial AP (NOAA GHCN station USW00093067), about 21 km from the city centre.

How we build these numbers →

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