How extreme does Hanworth's weather get?

The hottest, coldest, wettest and snowiest days Hanworth 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 (1973–present), from the Heathrow station 7 km away. Updated through August 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 Hanworth has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

100°F Aug 10, 2003

That is about 25°F hotter than a normal August afternoon in Hanworth (typical high near 75°F).

The three most extreme on record

1 100°F Aug 10, 2003

2 98°F Aug 3, 1990

3 98°F Jul 1, 2015

❄️ Coldest night

10°F Dec 13, 1981

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

The three most extreme on record

1 10°F Dec 13, 1981

2 12°F Dec 24, 1981

3 15°F Feb 10, 1986

🌧️ Most rain in one day

10.16 in Jul 14, 1975

More rain in a single day than Hanworth usually gets in the whole month of July (typical July total about 1.8 in).

The three most extreme on record

1 10.16 in Jul 14, 1975

2 10.16 in Oct 24, 1977

3 10.12 in Aug 19, 1993

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

Hanworth's record heat sits well above even a hot day for the season — August's 100°F is about 25°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, Hanworth's warmest days reach the mid-70s°F and its coldest nights drop to the mid-30s°F. But across the record it has gone as high as 100°F and as low as 10°F. A single day has delivered over 10 inches of rain. 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 30 years of daily observations at Northolt, a weather station, about 14 km from the city centre. The underlying daily records come from NOAA's global station network.

How we build these numbers →

← Hanworth city detail