Reminds me some of the differences that can be found between the climate on Miami Beach (barrier island....Biscayne Bay to the west, Atlantic to the east) and areas inland even just 10 miles away...
Total Annual Rainfall is 46.85" on Miami Beach, while annual rainfall at Miami International Airport (less than 10 miles to the west) averages 60.00" - over 13" difference. The seabreezes tend to stabilize the air over the beach....with the sea breeze convergences that lead to heavy summer storms taking place inland a bit. There are many days, where it is sunny on the beach, clear as you look east over the atlantic, and huge thunderstorm build-up off to the west.
The ocean effect leads to warmer average nights on Miami Beach than at the airport for all 12 months. For example, the average low temp in December is 64.8 deg on Miami Beach and 61.8 deg at the airport. During wintertime, there can be the 10-15 degree differences you mention in St. Pete.
At the same time, the high temps are the opposite...it is warmer in terms of average high temp at the airport than on Miami Beach by a couple of degrees for all 12 months. Interesting stat - Miami Beach averages only 16.8 days above 90 deg each year....while less than 10 miles inland, the airport averages 62.5 days over 90. But Miami Beach also has many nights where the low doesn't drop below 80 in the summer...reflective of the temp spread you might see in the Caribbean.
gatorcane wrote:Tampa Bay Hurricane wrote:Currently 42*F at my house; far from the 57*F at the Saint Petersburg official
station; talk about microclimates.
Indeed Pinellas County has one of the more distinct macroclimates in the state of Florida. The Southern part of the county is a peninsula surrounded by water on all sides but the north. In fact the SE part of the county (downtown St. Petersburg and old northeast) can be up 10 degrees warmer than locations away from the bay in Hillsborough county. The northern part of pinellas county does not benefit from the warmth of Tampa Bay during cold fronts though and is quite a bit colder than the Southern part of the county. The vegetation differences within the county show the microclimate. The Southern part of the county can support Royal Palms and Coconut palms (coconut palms along the coastal areas of southern county only). The northern part of the county does not support these types of palms and is largely dominated by pines, maples, oaks, and scrub palms with high tolerances to cold -- in fact the northern part of the county looks similar to "up north" in many ways (including the rolling hills that are not present in South county)