An atypical jet stream pattern that dipped well south into the Eastern U.S. produced a very wet month of July across Southeast Georgia and Northeast Florida. The Eastern U.S. middle level trough axis that extended south into the region produced a very moist southwesterly steering flow off the Gulf of Mexico for most of July, this led to abundant rainfall and slightly cooler than normal temperatures across the region. In fact, Gainesville set the record for the wettest July on record with 16.65 inches breaking the old July record of 16.41 inches in 1909. This new record in Gainesville was also the second wettest MONTH of all-time, behind only the 19.91 inches that fell in September 1894. As can be seen in the monthly rainfall graphic below, the southwest flow pattern brought excessive rainfall amounts of 10-20 inches for July along the Gulf Coastal areas with the highest amounts along the I-75 corridor of inland Northeast Florida, while amounts were generally in the 6-10 inch range across the remainder of the Southeast Georgia and coastal Northeast Florida with the other climate sites reporting amounts around 2 inches above normal.
This summer so far continues to run cooler than normal with only 27 days reaching 90 degrees or higher in Jacksonville, and only 12 days reaching 90 degrees or higher in July, the fewest amount since 10 days in 1975. Also, St Simons Island, GA only recorded 3 days of 90 degrees or higher, the fewest amount ever recorded for the month of July. This July was the coolest in Jacksonville since 2003.
|July 2013 Climate Data||Average Temperature||Monthly High||Monthly Low||Total Precipitation||Daily Max Precip||Highest Wind Gust|
|Jacksonville, FL (JAX)||80.6 F (-1.7 F)||93 F on 30th||70 F on 14th||8.65" (+2.10")||2.12" on 11th||38 mph on 20th|
|Gainesville, FL (GNV)||81.0 F (-0.2 F)||95 F on 26th||71 F on 29th||
All-time Record for July
|3.55" on 31st||44 mph on 5th|
|Alma, GA (AMG)||80.5 F (-1.5 F)||94 F on 29th||70F on 19th||6.98" (+1.65")||1.02" on 4th||37 mph on 11th|
|St. Simons Island, GA (SSI)||81.2 F (-1.6 F)||91 F on 30th||72 F on 20th||6.31" (+2.23")||1.18" on 12th||43 mph on 22nd|
The weather outlook for the month of August is for greater chances of above normal rainfall and equal chances of above, below or near normal temperatures and can be viewed at the CPC website.
NWS Jacksonville, FL Climate Focal Point