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Weather extremes

How extreme does Bellingham's weather get?

The hottest, coldest, wettest and snowiest days Bellingham 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 Whidbey Island Nas station 47 km away. Updated through October 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 Bellingham has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
89°F Sep 28, 2017

That is about 22°F hotter than a normal September afternoon in Bellingham (typical high near 67°F).

The three most extreme on record

1 89°F Sep 28, 2017
2 88°F Sep 6, 1986
3 88°F Jul 19, 2015
❄️ Coldest night
0°F May 29, 2007

About 48°F colder than a normal May night in Bellingham (typical low near 48°F).

The three most extreme on record

1 0°F May 29, 2007
2 0°F May 3, 2008
3 5°F Jan 28, 1972
🌧️ Most rain in one day
3.03 in Sep 1, 1983

More rain in a single day than Bellingham usually gets in the whole month of September (typical September total about 1.1 in).

The three most extreme on record

1 3.03 in Sep 1, 1983
2 2.29 in Nov 9, 1990
3 1.88 in Nov 7, 1995
⛄ Most snow in one day
9.0 in Dec 29, 1996

Close to a whole typical December's snow in one day (Bellingham averages about 2 in across the month).

The three most extreme on record

1 9.0 in Dec 29, 1996
2 8.0 in Feb 16, 1990
3 7.3 in Nov 26, 1985

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.

-10°10°30°50°70°90°110° all-time high 89°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Bellingham's record heat sits well above even a hot day for the season — September's 89°F is about 22°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, Bellingham's warmest days reach the low 70s°F and its coldest nights drop to the high 30s°F. But across the record it has gone as high as 89°F and as low as 0°F. A single day has delivered over 3 inches of rain or close to 9 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 — 1991–2020 normals computed from 27 years of daily observations at White Rock Campbell Scientific, a weather station, about 36 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →