SOLAR VARIATION AND WEATHER—ABBOT 127 
departures from normal temperature and normal barometric pressure 
at numerous cities. For this purpose I tabulated the departures, let 
us say of temperature, to illustrate, for 5 days before, and for 14 days 
after, each date included in table 2. Figure 4 is a facsimile of such a 
tabulation of temperature departures covering the months of 
January, February, and March for Washington, D. C. Two curves 
of temperature departures are shown for each month. One corre- 
sponds to the average influence of sequences of rising solar activ- 
ity, the other to the average influence of sequences of falling solar 
activity over the years 1924 to 1939. It is to be understood that these 
curves show temperatures only, not solar constants. One knows only 
that on the zeroth day of each line of the table a 3- to 4-day sequence 
of solar changes began. The upper curves of the figure show the 
average march of temperature departures at Washington in the months 
of January, February, and March, each associated with 19 or more cases 
of rising solar sequences, and the lower curves show the average march 
of temperature departures at Washington in January, February, and 
March, each associated with from 16 to 21 cases of falling solar 
sequences. 
TABLE 2.—Dates when sequences of rise and fall of the sun’s emission of radiation 
began 
January February March April 
Rising Falling Rising i Rising 
24 #64 27 «13 24 17 24 8 2a 62 
25 
