Records were kept of maximum and minimum
temperatures from July 1955 to mid-September 1956.
The widest range of air temperature (94°) was
observed at a savannah station (S1) where the minimum
was 21°F in December 1955 and the maximum
was 115°F in July 1956. The widest range (92°)
in a zone (Z1) was from 112°F in July 1955 to 20°F
in December 1955. Since 1955 summer records are
lacking for the savannah, absolute comparisons cannot
be made. However, maximum temperatures in zone
stations were slightly lower in 1956 than in 1955.
Throughout the observation period air temperatures of
both savannah and zone stations were very similar,
except during the spring there was never more than
2° difference in the respective maximum and minimum
temperatures. In the spring, however, (end of
March to beginning of June), the maximum air
temperature in the savannah was up to 14°F higher
than the air temperature of the zones.
Soil temperatures of the zone and savannah, on
the other hand showed a more marked variation during
most of the year, but especially during the spring
when differences of up to 20°F between the respective
maximum and minimum pairs were recorded. At
these times the savannah instruments recorded the
higher temperatures. During the summer the maximum
soil temperatures in the savannah were seldom
below 135°F while the zone maximum soil temperatures
fluctuated between 110°-135°F. The ranges of
soil temperatures were from 20°F (Dec.) -135+°F
(summer) in the zones and from 22°F(Dec.)-135+°F
(summer) in the savannah.
There is probably a definite correlation between
the high evaporation rate and the pure sand soil of
the savannah and its higher soil temperatures. The
soil of the savannah dries out earlier in spring and
more completely than the zones so that the savannah
soil temperatures show a more rapid increase in the
early spring and reach higher maxima.