Hours of sunshine during winter months (Dec + Jan + Feb): Boston: 464 Seattle: 235 (-50%)
Annual hours of sunshine: Boston: 2615 Seattle: 2019 (-23%)
so it's accurate to say that Boston is sunnier than Seattle and much sunnier during the winter.
https://weather-and-climate.com/average-monthly-Rainfall-Tem...
Hours of sunshine during winter months (Dec + Jan + Feb): Boston: 464 Seattle: 235 (-50%)
Annual hours of sunshine: Boston: 2615 Seattle: 2019 (-23%)
so it's accurate to say that Boston is sunnier than Seattle and much sunnier during the winter.