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Hottest June since 1998

Jason Hess, Climate Focal Point

 

High pressure at the surface and aloft persisted over the southeastern U.S. for much of June. The wind patterns through the month were weaker than normal, and this light flow kept the local sea breeze fronts close to the coast which consequently prevented cool onshore flow to move far inland during the month. The light flow regime combined with a strong ridge of high pressure aloft brought a significant heat wave to the region that persisted through mid-June when temperatures reached the century mark at many locations.

 

June 2010 was the hottest since June of 1998.  Maximum temperatures reached 90°F or higher on most days across northeast Florida and southeast Georgia. 

 

June 14^th-15^th was the first time the Jacksonville International Airport reached 100°F on consecutive days since July 19^th-20^th in 2000.  The Jacksonville International Airport had a stretch of 10 days at or above 95°F from June 10^th-19^th. 

 

Gainesville reached at least 90°F on all but 2 days. Gainesville had a week long stretch of 95°F or above days from June 11^th-17^th. 

 

These stretches of hot weather were not unprecedented as they never challenged the all-time records of consecutive days when maximum temperatures reached 95°F at Jacksonville or Gainesville. For Jacksonville this record is 23 days set in 1875, and, in Gainesville, the record is 16 days set in 1998.

 

	Average Temp for June 2010 and Departure from Normal	Rank of Warmest June on Record	Hottest Day of June 2010	Number of Days that Reached 90° or Above & the Average Number of  90° Days for June	Number of Days that Reached 95° or Above & the Average Number of 95°  Days for June
JAX	82.8° + 3.7	8thwarmest / since 1871	102° / 15th	26 days / 14	14 days / 4
GNV	82.3° + 3.1	6th warmest / since 1903	99° / 15th	28 days / 18	10 days / 5
SSI	82.9° + 3.5	4th warmest / since 1948	99° / 14th	17 days / 9	4 days / 2
AMG	82.3° + 3.0	3rd warmest / since 1948	99° / 15th	26 days / 17	9 days / 5

 

 

The precipitation summary for June is more complex than the temperature summary. With the weak wind flow in place and the sea breeze fronts moving inland slowly and not penetrating as far inland as usual, the precipitation pattern during the month followed more of an airmass thunderstorm pattern.  This means that where precipitation fell, it was hit-or-miss.

 

Although two inland climate sites including Gainesville and Alma both received slightly above normal rainfall amounts, Alma actually reported its 5^th wettest June since 1948 with 8.78 inches.

 

While the sea breeze fronts did not penetrate far inland, they also did not generate  a lot of thunderstorm activity across coastal communities along the Atlantic Ocean. Such locations include Jacksonville and St Simons Island who had drier than normal conditions during June 2010. In fact, the 1.42 inches of rainfall at St Simons Island was the 5^th driest June on record since 1948.

 

 

	June 2010 Measured Rainfall & Monthly Departure from Normal (in inches)	June 2010 Ranking
JAX	3.73     - 1.64	38th driest / since 1871
GNV	8.99     + 2.21	25th wettest / since 1903
SSI	1.42     - 3.63	5th driest / since 1948
AMG	8.78     +3.29	5th wettest / since 1948

 

The latest forecast from the Climate Prediction Center for the remainder of the summer is calling for greater chances of above normal precipitation and warmer than normal temperatures across Northeast Florida and Southeast Georgia.