By Paul Homewood

Neil Catto has been looking at the statistical relationship between sunshine hours and British weather:

Fig 1 Daily UK Sunshine hours, mean Relative Humidity and maximum Temperature from 05Oct1998 to 31Jan2021

 
There are some interesting correlations between these three weather parameters, the strongest relationship is between Relative Humidity (RH) and Sun (S) [UV radiation] -0.76, the next strongest relationship is maximum temperature (Tx) and Sunshine (S) 0.53, and the weakest but still significant relationship is RH and Tx -0.42. Relative Humidity provides an indication of the amount of Water Vapour.
Relationships between Sunshine, RH and Temperature:
Given the very strong relationship between water vapour/RH and sunshine -0.76, this shows incoming UV radiation is significantly blocked by water vapour/RH including clouds, hence a large negative relationship. In other words, higher RH, less sunshine, lower RH, more sunshine.

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February 11, 2021 at 04:33AM