The MEAN STATE of the 

 Weather, kept by ProfefTor Euler 



For the fix Winter Months, November, De 

 and April, which make i8i days of the 



At 20 feet above the mean level of the I 

 into the Gulph of Finland. 



At highefl, 28.87 comn 



At loweft, 26.99 often( 



Difference, 1.88 The n 



Mean height, 28.02 Paris inch 

 It ftands 95 days above 28 inches, 



De l'Isle's Thermomel 

 Greateft cold, 196° commonly in January, 



HEIT, or 24°1 of R 

 Leaft cold, - 141° in November or April, 



S°i of Reaum. abo' 



Difference, 55° equal to 64° of Fahr. 



Mean cold of the night, 162° equal 23° of Fahr 



below o. And of the afternoon, 154° equal 27 



of Reaum. below o. 

 The cold has been above 170° for 47 nights, equal 



to io°f of Reaum. below o. And above 150' 



nights. 

 The mean term of the firft froft, the 9th October, 

 The mean term of the Neva freezmg, the 27th N< 



Perfefl: calm, 28 days. 



Brifli gales, 50 days. 



N. 14 days. E. 23 days. S. 



N.E. 19 S. E. 12 S.I 



IV. 



Sky clear, 39 days. Cloudy, 68 day: 



Fog, 26 



Rain, 30 



Snow, 64 Mean term of the fir) 



Qu:-.ntity of rain and melted fnow, 4-^,- or a 



Aurora Borealis, 16 or 17 days. 



Tempeft, feldom. 



Hail, ■ very feldom. 



