Everything about Mesothermal totally explained
In
climatology, the term
mesothermal is used to refer to certain forms of
climate found typically in the
Earth's
Temperate Zones. It has a moderate amount of heat, with winters not cold enough to sustain snow cover. Summers are warm within oceanic climate regimes, and hot within continental climate regimes.
Origin of term
The term is derived from two
Greek words meaning "having a moderate amount of heat." This can be misinterpreted, however, since the term is actually intended to describe only the
temperature conditions that prevail during the
winter months, rather than those for the year as a whole.
Definition
Under the broadest definition, all places with an average temperature in their coldest month that's colder than 18°C, but warmer than −3°C, are said to have a mesothermal climate. In some climate classification schemes, however, this is divided into two segments, with a coldest-month average of 6°C being the line of demarcation between them; then only those locations with a coldest-month temperature of between −3°C and 6°C are reckoned as mesothermal, the label "
subtropical" being applied to areas where the average temperature in the coldest month ranges from 6°C to 18°C.
Observing the narrower definition articulated above, the mesothermal locations are those where the winters are too cold to allow year-round
photosynthesis, but not cold enough to support a fixed period of continuous
snow cover every year.
Range
In the USA, the boundary line between mesothermal and microthermal ranges is between
Juneau and
Sitka at the Pacific Ocean. It goes sharply south to about 38N latitude in the Rockies, and back up to around 43N latitude on the east coast. The border with the megathermal zone passes through Southern Florida.
Summer
Summers in these places may be hot (that is to say, having an average temperature in their warmest month of 22°C or above) or merely warm (with the warmest month averaging between 10°C and 22°C). The hot-summer, or continental, mesothermal climate is encountered exclusively in the
Northern Hemisphere, in the landmass interiors of
Asia and
North America and along their east coasts, while the most frequently seen example of a warm-summer mesothermal climate is the
oceanic climates found along the west coasts of all of the world's continents, roughly equidistant between the geographical
tropical and
polar zones.
List of mesothermal cities and their summer temperatures:
Hong Kong-hot summer
Milan-hot summer
New York City-hot summer
Tokyo-hot summer
London-warm summer
Mexico City-warm summer
Vancouver-warm summer
Moisture
In addition to being subdivisible by summer temperature, mesothermal climates can also be subclassified on the basis of
precipitation — into
humid,
semiarid and
arid subtypes.
Further Information
Get more info on 'Mesothermal'.
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