For fifteen consecutive days during the month of June, our daytime high temperatures have remained below 100 degrees at Phoenix Sky Harbor Airport.
The current streak of sub-100 degree-days commenced on June 5th. This ties for the third-longest sub-100 degree streak ever observed during the month of June.
The longest streak of sub-100 degree-days for phoenix during June was 17 days, which occurred from June 1st to June 17th in 1913. Daytime high temperature data for phoenix exist from 1896 to present day. The average daily high temperature during our current 15-day sub-100 degree stretch was 95.2 degrees, the fourth coolest on record.
The coolest average daytime high for June 5th through the 19th was 91.8 degrees, which occurred in 1967. Interestingly, the third coolest 5-19 June occurred only 11 years ago in 1998 when the average daily high temperature was 95.1 degrees. Although the current streak of sub-100 degree-days in June is impressive, it is not unusual to experience sub-100 degree high temperatures in June.
The long-term average number of sub-100 degree-days in June is 9, although that number lowers to 6 if the considered period is shortened to 1971-2008.
In addition to June 2009, recent Junes with an above-normal number of sub-100 degree-days in phoenix include 1995 with 12 days, 1997 with 11 days, 1998 with 14 days, 1999 with 11 days and 2005 with 10 days. On the opposite side of the ledger, since 2000, 5 or fewer sub-100 degree June days occurred in all but two Junes, June 2005 and June 2009, and no sub-100 degree June days occurred in 2006.
