Historical Ranked Spells - Mean Temperature · Above 20.0 °C
Longest Above 20.0 °C
#
Length
Period
1
18 days
30 Jun 2026 – 17 Jul 2026
2
13 days
16 Jun 2026 – 28 Jun 2026
3
12 days
22 Jun 2010 – 3 Jul 2010
4
11 days
22 Jul 2026 – 1 Aug 2026
5
10 days
15 Jul 2014 – 24 Jul 2014
6
10 days
18 Jul 2018 – 27 Jul 2018
7
9 days
5 Aug 2020 – 13 Aug 2020
8
9 days
7 Aug 2022 – 15 Aug 2022
9
9 days
22 May 2026 – 30 May 2026
10
8 days
1 Aug 2018 – 8 Aug 2018
11
8 days
4 Sep 2023 – 11 Sep 2023
12
7 days
13 Jul 2013 – 19 Jul 2013
13
7 days
21 Jul 2013 – 27 Jul 2013
14
7 days
4 Jul 2017 – 10 Jul 2017
15
7 days
29 Jul 2022 – 4 Aug 2022
16
7 days
10 Jun 2023 – 16 Jun 2023
17
7 days
16 Jun 2025 – 22 Jun 2025
18
7 days
25 Jun 2025 – 1 Jul 2025
19
6 days
17 Jun 2017 – 22 Jun 2017
20
6 days
23 Aug 2019 – 28 Aug 2019
21
6 days
17 Jul 2021 – 22 Jul 2021
22
6 days
8 Jul 2022 – 13 Jul 2022
23
6 days
15 Jul 2022 – 20 Jul 2022
24
6 days
29 Jul 2024 – 3 Aug 2024
25
6 days
9 Jul 2025 – 14 Jul 2025
Longest consecutive-day spells from 2009 to present for London, NW3. Rule: Mean Temperature ≥ 20.0 °C.
Found 142 matching spells. Showing top 25. Data for Mean Temperature begins in 1881.
Mean air temperature for the day (midnight to midnight, local time), averaged from the logged readings.