Question in weeks but answers in months, that raises this question:
Week commencing 26 April 2020 was 416.82
Does that week count as April because began in April?
or April because most in April?
or May because it ends in May?
3.18 increase in a year after likely La Nina this winter doesn't seem likely.
Week commencing 24 May 2020 417.43
Annual increase of 2.57 needed and last posted increase 2.72 so La Nina only has to knock .15 off that increase for May 2021 to fail.
Record week in 2019 was beaten in March 2020 by .35
Record week in 2018 was not beaten until week commencing 31 March 2019 by .32
April usually increases over March by a lot so seems likely to happen by April 22.
So initial reaction is that sensible answers seem to be May 2021 or Feb-March 2022 or April 2022.
More info by closing date of 4 Feb 21 and cannot change vote suggests waiting before actually making vote.
I am using
https://www.esrl.noaa.gov/gmd/ccgg/trends/data.html for data but there could be other sources so perhaps the source of data should be specified?