Как правильно считать кол-во солнечных и пасмурных дней

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В гугле ввожу
how many sunny days portland
результат вылазит цитата
http://www.bestplaces.net/climate/city/oregon/portland" onclick="window.open(this.href);return false;

Portland, Oregon, gets 42 inches of rain per year. The US average is 37. Snowfall is 3 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 154.

On average, there are 144 sunny days per year in Portland, Oregon. The July high is around 79 degrees. The January low is 37. Our comfort index, which is based on humidity during the hot months, is a 63 out of 100, where higher is more comfortable. The US average on the comfort index is 44.

how many sunny days colorado springs
https://www.currentresults.com/Weather/ ... nshine.php" onclick="window.open(this.href);return false;

Number of Sunny Days
City Sunny Partly Sunny
Colorado Springs 127 120
Denver 115 130
Grand Junction 136 106
Pueblo 139 119
1 more row, 1 more column

В Портланде больше получается

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Вот вроде бы неплохо показано
https://www.washingtonpost.com/news/won ... laces-are/" onclick="window.open(this.href);return false;