No sun, no UV, no evaporation, no rain – just thick fog!

There are very few days in the year when there is no measurable UV light. Yesterday was the first since February 17th. The thick fog, with visibility down to less than 100m that developed overnight, only lifted a little during the day with visibility extending to around 700m by mid-afternoon. Due to the thick fog there was no evaporation, the first occasion that this has happened in 2016.
The slow change in the warmer, moister air from the Azores meant that the thermometer began to rise after dawn, from 3.9C to 9C at dusk. Overnight the thermometer continued to rise with a maximum of 10.2C. This is the highest reading since 21st November.
There were extended periods yesterday when the air was totally still with occasional gusts in single figures. However, as the night wore on there were several readings into double figures with a maximum gust of 15mph just befit 9pm.