I wrote some code a long while ago now that correlated temperatures in the Central England with the corresponding weather type from the objective Lamb Weather Type series. I compared just the six pure types, anticyclonic, cyclonic, northerly, easterly, southerly and westerly. The application allows you to correlate using the mean, maximum or minimum temperatures with the LWTLWT Lamb Weather Types are often used in UK-based analyses, with individual weather patterns based on the eight primary cardinal directions (N, NE, E, SE, S, SW, W, NW) plus cyclonic (C), anticyclonic (A) and unclassified (U) types. on that day. I may have published these charts in a previous blog but I forget, so here they are again 😉
Cyclonic types, whatever the time of years generally seem to be associated with colder anomalies.
Mean temperatures in anticyclonic types are generally only warmer in the months of June or July, otherwise they are invariably colder. See below for charts of maximum and minimum CETs.
As you would expect northerly LWT types always produce colder mean temperatures in central England.
Not surprisingly E types are much colder from October to May, but a little warmer in the extended summer months.
Southerly types are warmer from around April till the end of October, otherwise they produce lower than average mean temperatures.
Westerly types in contrast to N, S, and E types are usually a little colder in the summer, from mid-April to the start of October, in winter they are nearly always milder.
Above are charts for mean maximum and mean minimum temperatures for anticyclonic types, the results of which are a little surprising to me, in that the maximum correlation in summer months is much lower than I imagined it would be, because of course you naturally assume the A type, must be the one favoured for many of the very warm spells in summer. I calculated all the anomalies in the correlations using the 1878-2023 long-term averages, which I thought was the fairest way of doing things, but maybe I was wrong. Perhaps if I revisit this code again I’ll add the frequency each weather type occurs. 😜