SOURCE: National Weather Service Portland, Oregon

PORTLAND's
RELATIVE HUMIDITY DEPENDING ON TIME OF DAY

Period of Record...October 1940 - May 1999



Time is Local Standard Time (LST)

TIME JAN FEB MAR APR MAY JUN
4 AM 86% 86% 86% 86% 85% 84%
10 AM 82% 80% 73% 69% 66% 65%
4 PM 75% 67% 60% 55% 53% 49%
10 PM 83% 81% 78% 75% 74% 71%


TIME JUL AUG SEP OCT NOV DEC Annual
4 AM 82% 84% 87% 90% 88% 87% 86%
10 AM 62% 64% 67% 78% 82% 84% 73%
4 PM 45% 46% 48% 62% 74% 78% 59%
10 PM 68% 70% 75% 84% 84% 85% 77%

1Normals are the 30 year climatic normals, based on 1961-90 data.