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December through May, and least frequently in June and July. The mean annual 
precipitation for the period is 42*59 inches, with a maximum of 5«07 inches 
occurring in January and August, and a minimum of 2.03 inches in November. A 
secondary maximum of 4.92 inches occurs in October. Combining amount of pre¬ 
cipitation and days with measurable precipitatipn shows May and June to be the 
driest months of the year. During the remaining months measurable rain falls 
on from 10 to 17 days. No snow has been recorded. Thunderstorms have been 
recorded in all months except February, March and April but peak activity seems 
to occur during August, September and November. The annual average relative 
humidity is 76 per cent with a high monthly mean of 89 per cent and a low of 
62 per cent. 
During the periods for which data are available no tropical storm or typhoon 
has passed through the area, though storms of tropical character have passed 
within 500 miles, causing a noticeable increase in precipitation and winds, 
especially in September of 1957j 1958 and 1959j October and November 1962 , and 
December 1964. . 
The maximum sustained wind recorded for Midway is 44 knots in January. 
Maximum winds are lowest in June, July and August, are high in September and 
December, and also low in October. Maximum winds occur generally from the east 
from July through October, and from the west the remainder of the year. Peak 
gusts of 77 and 67 knots have been recorded in December and January respectively, 
during the period when the Easterlies are not present. From May through August 
peaks range from 35 to 4l knots and in the remaining months from 42 to 55 knots. 
Gusts are generally from the west. 
Surface wind speeds and directions are shown in Figure VlX* The prevailing 
wind direction ten months of the year is the easterly, and during December and 
January westerly. The annual mean wind speed is 10 knots, with a range of 5 
A v eco ^ eTS. 
knots. No sustained winds over 40 knot s/gener ally range from northeast to 
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V>At>Vs> 
