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Boston vs London weather: climate comparison
London is the warmer of the two, averaging 52°F (11°C) over the year against 51°F (11°C) in Boston. Boston is wetter, with 45.4 in (1154 mm) of precipitation a year to London's 26.4 in (671 mm). Below: every month side by side, from 30 years of ERA5 data (1996–2025).
- Mean temperature
- 10.6°C Boston
10.9°C London - Annual precipitation
- 1154.0 mm Boston
671.0 mm London - Rainy days a year
- 121 Boston
128 London - Sunshine per day
- 8.6 h Boston
7.5 h London
Month by month
| Month | Boston | London |
|---|---|---|
| January | 1.9°C | 7.3°C |
| February | 3.5°C | 8.3°C |
| March | 7.5°C | 10.6°C |
| April | 13.5°C | 13.7°C |
| May | 19.1°C | 16.9°C |
| June | 24.4°C | 20.1°C |
| July | 27.9°C | 21.9°C |
| August | 26.9°C | 21.6°C |
| September | 22.9°C | 19.1°C |
| October | 16.5°C | 15.1°C |
| November | 10.2°C | 10.6°C |
| December | 5.0°C | 8.0°C |
Year at a glance
| Measure | Boston | London |
|---|---|---|
| Mean annual temperature | 10.6°C | 10.9°C |
| Warmest month (avg high) | Jul · 28°C | Jul · 22°C |
| Coldest month (avg low) | Jan · -7°C | Jan · 2°C |
| Annual range (warmest high − coldest low) | 34°C | 20°C |
| Annual precipitation | 1154.0 mm | 671.0 mm |
| Rainy days per year | 121 | 128 |
| Wettest / driest month | Mar / Feb | Nov / Mar |
| Average sunshine per day | 8.6 h | 7.5 h |
In short: London is the warmest overall (10.9°C mean); Boston gets the most precipitation (1154.0 mm a year); Boston is the sunniest (8.6 h a day on average); London has the smallest swing between its warmest and coldest months.
Record high 1996–2025: Boston 40.3°C (2011-07-22), London 37.9°C (2022-07-19). Record low: Boston -26.4°C (2016-02-14), London -10.3°C (2021-02-11).
Source: Open-Meteo Historical Weather API (CC BY 4.0). Values are ERA5 reanalysis model data on a ~9–25 km grid, not readings from a weather station, so a single town’s thermometer can differ by a few degrees and local showers can be missed. Monthly means of daily ERA5 values, 1996–2025, for the grid cells nearest Boston (42.36, -71.13) and London (51.49, -0.16).
Which months differ most?
The gap in average highs is widest in July, when Boston runs 11°F / 6°C warmer, and narrowest in April (0°F / 0°C apart). The biggest rainfall difference is in March: Boston gets 2.7 in (69 mm) more on average.
Add a third or fourth city, or swap in any other place, in the full comparison tool. For one city in depth, see the Boston climate and London climate pages.
Compare Boston or London with another city
Questions people ask
Is Boston warmer than London?
London is warmer on average: its mean annual temperature is 52°F (11°C) against 51°F (11°C) in Boston (ERA5, 1996–2025).
Which gets more rain, Boston or London?
Boston, with about 45.4 in (1154 mm) of precipitation a year and 121 days with at least 1 mm, compared with 26.4 in (671 mm) and 128 days in London.
Which is sunnier, Boston or London?
Boston averages more sunshine: 8.6 h a day against 7.5 h. Sunshine duration is modelled from cloud cover.
How reliable is this comparison?
Both cities use the same 30-year reanalysis, so differences are consistent. Absolute values describe a grid cell several kilometres wide and can differ by a degree or two from the airport station.