Updated Comment for period 1988 to 2023.
The Above average Winters, Spring Summer and Autumn Season in the UK, affected by El Nino and La Nina, though Cold Spells with proper frosts happen to occur in Winter's they tend to last 3-12 days. Some 2-3 weeks of Mild SW flows are a regular thing. UK has mixed weather in all Seasons. It can be mild damp wet in winter, Cold frosty foggy Snowy Spells if very lucky, or it can be frosty and cold in March to May that is the worst part, and sometimes Cloudy overcast very chilly even in May and June or even in September to November, less frost and snow.
Springs, Summer's have trended to be well above average some hot heatwaves lasting 3-5 days with greater amounts of sunshine, and all 4 seasons feature lengthy long fetch mild SW flows sometimes with strong winds and heavy rain or settled dry sunny spells. or extremely heavy thundery showers or longer spells of Thundery rain in any Season in the UK. And 2 year long droughts.
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