First Frost
November is climatologically when most inland sites across the NWS Jacksonville forecast area have their first frosty morning. For frost to form, similar conditions conducive to dew formation are needed, including light low level winds and low level moisture. Frost forms when the temperature at the ground reaches freezing, or 32 °F. If the dew point temperature (which measures the amount of moisture in the air) also nears freezing, then the moisture in the air near the freezing ground changes from water vapor to solid ice crystals and the ice will deposit itself on objects that had also reach freezing, which includes grass, plants and roof tops.
November is climatologically when most inland sites across the NWS Jacksonville forecast area have their first frosty morning. For frost to form, similar conditions conducive to dew formation are needed, including light low level winds and low level moisture. Frost forms when the temperature at the ground reaches freezing, or 32 °F. If the dew point temperature (which measures the amount of moisture in the air) also nears freezing, then the moisture in the air near the freezing ground changes from water vapor to solid ice crystals and the ice will deposit itself on objects that had also reach freezing, which includes grass, plants and roof tops.
Many times frost is observed when measured
temperatures are in the mid 30s and not at the freezing mark. Why is
this? Standard temperature measurements are made generally between 4
and 6 feet above ground level. The coldest air is the densest, which
means that it will lingering at ground level. The actual temperatures
will sometimes be many degrees below the observed temperature, which is
usually measured many feet about ground level. This is why sometimes
observed temperatures are warmer than freezing, despite a widespread
frost indicating freezing temperatures at ground level.
The NWS Jacksonville will issue a Frost Advisory for
northeast Florida when widespread frost is expected (and a freeze
warning is not in effect). For southeast Georgia, a frost advisory will
be issued until the first hard freeze event is experienced, then frost
advisories will resume, if necessary, after March 1st. Below is a map of the average date of the first frost
(based on temperatures of 36 ° F or lower) across the NWS Jacksonville
forecast area.
First Average Frost On First Coast |
First Freeze
NWS Jacksonville will issue a Freeze Warnings when
forecast temperatures are expected to remain below 32 ° F for 2 or more
hours. Freeze warnings will continue to be issued throughout the cool
season as needed for northeast Florida. Freeze warnings will not be
issued for southeast Georgia after the first widespread hard freeze of
the season (temperatures 27 ° F or less). Freeze warnings will resume for southeast Georgia as needed after March 1st.
Hard Freeze Warnings will be issued as needed for the
entire forecast area when minimum temperatures are expected to fall at
or below 27 ° F for 2 or more hours. Freeze Watches will be issued typically within 24 to 36 hours of a forecast freeze event. Below is a map of the average date of the first freeze across the NWS Jacksonville forecast area.
Average First Freeze |
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