How extreme does Chillum's weather get?

The hottest, coldest, wettest and snowiest days Chillum 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 Natl Arboretum Dc station 6 km away. Updated through March 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 Chillum has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

106°F Jul 30, 2011

That is about 16°F hotter than a normal July afternoon in Chillum (typical high near 90°F).

The three most extreme on record

1 106°F Jul 30, 2011

2 105°F Jul 23, 2011

3 104°F May 1, 1988

❄️ Coldest night

-10°F Jan 17, 1982

About 38°F colder than a normal January night in Chillum (typical low near 28°F).

The three most extreme on record

1 -10°F Jan 17, 1982

2 -6°F Jan 21, 1985

3 -5°F Jan 11, 1982

🌧️ Most rain in one day

7.37 in Jun 26, 2006

More rain in a single day than Chillum usually gets in the whole month of June (typical June total about 4.6 in).

The three most extreme on record

1 7.37 in Jun 26, 2006

2 6.28 in Jun 22, 1972

3 6.18 in Sep 6, 1979

⛄ Most snow in one day

11.6 in Dec 20, 2009

Close to a whole typical December's snow in one day (Chillum averages about 1 in across the month).

The three most extreme on record

1 11.6 in Dec 20, 2009

2 11.0 in Feb 19, 1979

3 9.5 in Nov 12, 1987

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

Chillum's record heat sits well above even a hot day for the season — July's 106°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, Chillum's warmest days reach the low 90s°F and its coldest nights drop to the high 20s°F. But across the record it has gone as high as 106°F and as low as −10°F. A single day has delivered over 7 inches of rain or close to 12 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 Oxon Hill (NOAA GHCN station USC00186800), about 19 km from the city centre.

How we build these numbers →

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