Writing weather - the historically accurate way

In the final stages of editing my second novel, The Running Lie, I'm doing lots of tidying and final checks. Today I've been looking at weather in 1952. I've quite cheerfully added heavy rains that didn't occur at the end of June, but I learned from the Met Office that the first of July was very warm (as they politely say) with temperatures reaching 90 degrees Fahrenheit. It's just as well I have a main character doing a great deal of physical labour that day! It's an interesting experience to use real weather reports to add to the dramatic tension in a narrative. Even if I do reserve the right to move a thunderstorm that happened on the 1st of July to the 30th of June.