Rare July Weather Continues
The Portland International Airport will close out the month of July without a single 90 degree high temperature. This is the first such occurrence in the month of July in nearly 20 years. One has to go back to July of 1993 in order to find another July without a single 90 degree high temperature in Portland. The average temperature at the airport is just 66.3 degrees (through 7/28) which is -1.7 degrees below normal for the month-to-date. The average (normal) high temperature in Portland for the month of July is just over 68 degrees. Cool onshore flow continues this summer with no heat waves on the horizon anytime soon. Portland’s highest temperature so far this entire calendar year is 87 degrees, set on July 6th and again on July 24th. Historically speaking, the average first 90 degree temperature of the year in Portland occurs on June 30th. We are a solid 30 days behind schedule which continues the trend over the past few months. The last month that Portland experienced an average monthly temperature at or above normal was in January. Below are some additional stats on just how cool this July has been:
Average monthly temperature departures at the Portland International Airport in 2011
January = +1.8 degrees above normal
February = -2.8 degrees below normal
March = -1.1 degrees below normal
April = -3.3 degrees below normal
May = -3.0 degrees below normal
June = -1.0 degrees below normal
July (through 7/28) = -1.7 degrees below normal
July’s that have never reached 90 degrees or higher at the Portland International Airport (Period of record used is 1950-2011)
2011
1993
1989
1986
1966
1964
1963
1957
1955
1954 (Note – there were no 90 degree high temperatures the entire calendar year in 1954. This is the only occurrence on record of this at the Portland International Airport).
Most ever 90 degree days in July at the Portland International Airport (Period of record used is 1950-2011)
14 of 31 July days in 2009
Latest first 90 degree temperature (or higher) at the Portland International Airport in a given calendar year (Period of record used is 1940-2011)
September 13th 1957
Top 5 coldest July’s on record at the Portland International Airport (Period of record used is 1950-2011)
YEAR / JULY
1954 / 63.0
1963 / 63.0
1955 / 63.4
1993 / 64.3
1964 / 64.5
Warmest July average temperature on record at the Portland International Airport (Period of record used is 1950-2011)
74.1 degrees in 1985
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Stay tuned!
Steve Pierce
http://www.piercevideo.com/weather.shtml