Well as anyone who lives in the UK knows, we haven't actually had
a summer this year. Just cold weather and tons of rain. Now I know global warming = more rain (my geography teacher back in school went on and on about how it should really be called 'global warming and wetting') and I get that, with warmer air leading to more sea being evaporated (which kind of goes against sea levels rising doesn't it? Not that I'm saying they're not) and hence more rain. But isn't it supposed to be wetter and
warmer? Where's all the sunshine???
Have a look at the UK met office sitehttp://www.metoffice.gov.uk/climate/uk/anomacts/
set Climate variable
daily maximum temperatureYear
as requiredMap type
1971-2000 for Jan to June anomaly
1981-2010 July to present anomaly
You will see that Jan Feb and March were dramatically warmer and June and July were cooler and much wetter.
The first point should be obvious and that is more cloud in summer means lower temperatures due to the reduction in solar heating reaching the surface.
On the other hand in winter the cloud actually reduces the the rate of cooling and therefore temperatures stay above average.
This is easily confirmed by the observation that on clear nights the temperature drops much quicker than on cloudy nights.
Green house gases simply raise the average temperature everywhere but as they work primarily by reducing the rate at which cooling at the surface occurs, their effects show up most clearly in winter and at night.
The higher temperatures mean the atmosphere can hold more water which in turn implies heavier rainfall in some areas. This appears to be happening with flash flooding and extreme rainfall events being reported in recent times.