4 Meteorological Register kept at St. Petersburgh [Juny, 
Z| 3 |8 
a|'3 | 8 
me | A mS 
3. a. Mean temperature in the mornings and evenings ............ 333)149°7 | — 
b. The same during the summer, or from May till October. ....} 49 |136°0 72 
c. The same during the winter, or from November till April....) 20 |160°5/— 6% 
4. a. Mean temperature at two o’clock after mid-day............. A434)141-0 4a 
b. The same during the six summer months .............----./ GL |1260] 123 
c. The same during the six winter months.......-+.-..--+. «| 27 |154°8!— 22 
In general, January was the coldest, and July the hottest 
month. 
The first frost was always between the 8th of Sept. and the 
9th of Oct. ; but in general about the 27th of Sept.; and the last 
frost always between the Ist of April and the 12th of May, but 
mostly in April. 
Each year had about. 112 complete winter days, 59 harvest 
and spring days, with frost in the night, and 194 summer days. 
The ice in the Neva River at St. Petersburgh was broken up 
sometimes on the 22d of March, generally on the Ist of April, 
and never after the 3lst of this month. This river was never 
frozen again before the 16th of October, mostly on the 14th of 
November, and never later than the 12th of December. The 
river was navigable generally 218 days, and covered with ice 147 
days. 
Each year had, for the most part, 69 perfectly calm days, 166 
days of strong wind, 103 windy, and 27 very stormy days. The 
west wind prevailed the most, and the south wind the least. 
Jannary was the most stormy, and had westerly winds, and July 
was the calmest month. The north wind reigned in April, the 
east in July, the south in November, and the rest in August. 
Each year had 91 fair days, 118 completely dull, 156 partly 
cloudy days, 106 rainy, 73 showery, 43 foggy, and 4 times hail ; 
13 to 14 times thunder, and 21 northern hghts. In the year 
1786, it thundered 18 times’; in 1790 only 6 times : these are 
the extremes in 20 years. 
The year 1774 had the most thunder and northern lights, the 
thunder having been heard 17 times, and the northern lights 
seen 48 times. It is remarkable that the northern lights have 
decreased since 1782, as from that year to 1756, they were seen 
110 times, and only 39 times from 1787 to 1791. 
The most serene months were April and June,’ next to them 
March, May, and July; November, December, and January, 
were the dullest months; August was the most cloudy and 
variable, and next to it, the months July, May, and September. 
The greatest fogs are in February, and the most rain in July, 
August, and September; the most snow falls in December. It 
hails the most in May; in September, somewhat less, but never 
