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The breakdown of various temperature thresholds for London.
<5c/41f: 5 days so far
<10c/50f: 58 days so far
18c/64f+: 145 days
20c/68f+: 119 days
25c/77f+: 36 days
26.7/80f+: 18 days
30c/86f+: 8 days
32c/90f+: 7 days
In my place all months have average highs above 20°C (68°F), nine months have mean temperature above 20°C (68°F) and eight months have average lows above 20°C (68°F).
I don't know the exact amount, but the annual average high is 23.3C so I would guess most days.
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