38S 



Br. Holyoke^s Meteorological Ohservationi. 



A Summary and Comparative View of tlie most important particulars^f 



contained in the foresroing Tables, 



£3 



Witliin the period of 26 years, from 1795 to 1818 inclusive* 



Mean yearly range of the ther- 



mometer 



In this period the mean of the 

 civil year coincided exactly 

 with tliat of the year, as 

 reckoned by the seasons. 



48^881 



I 





T!ie greatest change within 24 



hours - « - . 



during the 18 hours preced- 

 ing 8 A. M, of Feb. 10, 1810, 

 being nearly 3° per hour, in 

 round numbers. 



The leasf monthly range 



a verj' uniform range, not fall- 

 ing short of 31°, nor exceeding 



37^, in 21 years. 



50^ 



oiC 



AVithin the period of 33 years, from 1786 to 1818 inclusive. 



Mean 



Hatte; 



Coldest year, 1812 





^ 



^ 





Hottest in 1 806, mean - 

 Coldest in 1791, mean 

 Mean range - 

 Greatest range fr. -1 ItoGG 

 Hottest in 1793, mean - 

 Coldest in 1812, mean 40.994 

 Mean range - - 46.05 



Mth. 



Jan. 

 Feb. 



48°.678 

 50.96 



45.28 



SI.995jU|j^^ 



- 23.383 A 'i'l 



27.502 yj 



Hottest. 



o 



1802, 34.127 

 1797, 



32.867 



50.31.' 



3 



S 



g 



5 



33 



Greatest range fr. — 4to97 101 

 Hottest in 1793, mean - 72.615 

 Coldest in 1816, mean - 65.447 

 Mean range - - - 69.84 



June 



July 



Aug. 



Sept. 



Oct. 



IVov. 



Dec. 



1805, 39 802 



I8(i0, 50,627 



1793, 62.595 



1793, 71.78 

 1805, 75.582 

 1798, 75.777 

 1801, 66.225 

 1809, 57.995 

 1788, 44.3 



1 794, 40.367 



Coldest.- 



1792, 19'.ir 



1818, 19.812 



1812, 29.425 



17S6, 40.03 



49.017 

 61,815 



1816, QQ,Z^5 



1815, 66.532 



1812, 

 1816, 



1812, 58.385. 



1739, 45.52 



1786, 34.7- 



1790, 19.45 



a 



Greatest range fr. 41 to 101 60 



Hottest in 1802, mean - 54.607I Hottest day was June 23, 1816 101** 



a 



Coldest in 1B12, mean - 48.903; Coldest dars were Feb. 14, 1 817 



Mean ranfp. - - f;i ■^na' 1 t„.-* ■, ^ tn-in v 



Mean range 



Greatest range fr. 1 1 to 94 



51.S08J and Jan. 13, 1818, each 



Greatest range of the period 



83 



th- 





11 



112 



cr IS tae satne as that of \\ inter ana aum 



uier together, witiiin 8 thoiisandtii parts {The moan days fn a veJir, at 

 of a degree. ' * * 



The Spring is the most inconstant sea 

 son, considered with reference to its wid- 



rfr 



est rango j but the greatest monthly ranoe 



was in February 1810, 



The moans of the months 



indicate 



January to be the coldest and JuJv to be 



or below tlic freezing point, is 11 3.05 



Of course the season suitable 

 for vt gelation is not more than 



252 days, or about two thirds 

 of the year j and this season 



the hottest montU of the year, generally' 



They, huwever, shew 



1 





thai 



is much diniinislicd 

 and late frosts. 



hi 



m 



jfn a year the mercury is below 



zero, on a mean 



mometer 



speakin^ 



February is colder than Januar^ 



years in 33, or about 1 vear in S, and Au- *^'"> "" <* uicau 



fhouf?vlV'''°i"'^ « f ^■^^'' '•" ^^' "^ The mean days, when the tber- 



about 1 yearin 4. But m no instance ----- '^ ■ - --^ 



was February so cold, as the coldest Jan- 



Hary. Respecting the January of 1802 Dr. 



Holyoke remarks : '♦ Perhaps the warmcsJ 



January ever known." The hottest month 



m this period was August 1798, 75°.777 



Ine coidest month was Jan, 1792 19°. 17 



•U.J o 



ra ngcs 



at 80° and 



above, during a year are 



The mean days of the most in- 

 tense Jieat, or at 90° and above, 



during a year, are - - 



46.65 



8.57 



