Compare the average monthly precipitation (in inches) for Portland and Boston during the baseball season:
March: BOS 4.33, PDX 3.66
April: BOS 3.74, PDX 2.72
May: BOS 3.50, PDX 2.48
June: BOS 3.66, PDX 1.69
July: BOS 3.43, PDX 0.67
August: BOS 3.35, PDX 0.67
September: BOS 3.43, PDX 1.46
October: BOS 3.94, PDX 2.99
https://www.usclimatedata.com/climate/boston/massachusetts/united-states/usma0046
https://www.usclimatedata.com/climate/portland/oregon/united-states/usor0275
... and the average total hours of sunshine:
March: BOS 214, PDX 191
April: BOS 227, PDX 221
May: BOS 267, PDX 276
June: BOS 287, PDX 290
July: BOS 301, PDX 332
August: BOS 277, PDX 298
September: BOS 237, PDX 236
October: BOS 206, PDX 152
https://www.currentresults.com/Weather/US/average-annual-sunshine-by-city.php