As a more complete follow-up....
Multiple research studies have been undertaken to measure the impact of temperature and humidity on COVID-19 virus survival. There are also studies regarding direct sunlight and various surfaces on COVID virus survival.
The conclusion of these studies is that the impact of temperature, sunlight, and humidity on COVID is pretty similar to other coronavirus types (e.g the common cold) and other viruses such as the flu.
Generally bright sunlight with hotter temperatures will reduce the survival rate of the virus outdoors and slightly reduce outbreaks. However the impact is minimal when compared to human behavior.
For example -- warm weather countries such as Singapore should have had minimal issues with COVID if the virus was very dependent on temperature and humidity. The wealthy in Singapore had few issues but the virus spread widely in the crowded immigrant slums (at first undetected) despite the pleasant weather. Fortunately the government took action quickly near the beginning of this global crisis to get this under control.
The government of Singapore did this by altering human behavior -- mandatory masks etc. It was obvious the high temperature and sunlight would not have any meaningful impact in reducing the spread.
Florida will have an advantage over more northern states this winter. It is not because the heat and sunlight will have a direct significant impact on reducing COVID-19 spread. It is because the warmer weather will reduce the number of people from crowding together indoors. Florida will have outdoor dining options in January, New Hampshire not so much. Likewise Florida's pleasant weather will allow other activities to be outdoors such as gym fitness classes which will reduce spread. Of course this is countered by Florida's state government lax public health policies which greatly increase the spread (no mask mandate, etc.). The other issue facing Florida is that it has the largest percentage of population over 65 of any other state (tied with Maine) -- this group is very vulnerable to COVID.