Sun ? in Pompey ?
Phil, you'll be lucky not to be snow bound by the end of the week.
You can make a simple non-aspirated radiation shield for temperature sensors using white plastic flower pot saucers, threaded rods with plastic spacers, I've seen plans on various weather forums if you try a interweb search. If your keen you could try adding a small fan for the couple of days that the sun is out. Mind you when it gets addictive you'll end up buying an expensive station - in a month or so :-)
You'll have to add your wunderground id to your sig or profile then we can visit it.
Cheers
JC
(will send pm shortly, just had HRCT scan and bronchoscopy).