Red sky at night, sailors delight.
Red sky in the morning, sailor take warning.
Weather predicitions for the coming quarter are based on the day before, the day of and the day after the change of season
Example -- Spring to Summer
If June 20th was wet, then the first month, will be wet.
If June 21st was clear and warm, the 2nd month.
If June 22nd was extremely hot, then ... you got the idea!
Likewise for the rest of the 1/4's.