Meteorological Summary for 1829.-Hampshire. 395 

 Barometrical PRESsuRE.-Tlie mean pressure this year js -|. 

 of an inch higher than the mean of the last ^^^'-'^^l^Zl'l^eTol 

 number of changes is less than m any former year ^^J^at period 

 The mean pressure for December is high, but ^^f^Jor April, 



which was a very wet and stormy ™«»th «,^^7"^"'•'^Sj^s" with 

 The mean of the pressures at 8, 2, and 8 o clock, coincides witli 



''T^rERATuRL-The mean temperature of the.external air U.is 

 vear TsTower dian that of any year since 1816 : it is, however only 

 St of a Sre^lower and 4-43 degrees lower 



Ul^n that ofl828, which is the greatest difference that has yet oc- 

 purred here between any two consecutive years. 

 ""The mean temperatu/es of January and December were low, and 

 thev exactly agree with each other: the only remarkable anomaly 

 thaf haopen^d fs, that the mean of March was one-hundredth of a 

 decree 'lower than the mean of February. 



f ma; be seen by the table that the yearly "™-- .^^^f; ,^; 

 tnre of the external air did not exceed summer heat, which is tne 

 e St that has occurred since the year 1823, and U.at t^je -«-«- 

 was fourteen degrees below the freezing point in Decen be^ , but a 

 thermometer thit was exposed on a bed of snow the same night 



receded four degrees lower. o a tv/t ,i « P M roincide 



The mean yearly temperatures at 8 A.M. and 8 V.vM. coincioe 

 within about three-tenths of a degree. . 



The mean yearly temperature of >- observations each day 

 namely the maximum, minimum, at 8 A.M. and 8 F.M., is only 

 49T4^deg ree . This should be considered the truest year y mean 

 temperatu e! because the mean of the greatest number of thermo- 

 m"tS observations made every twenty-four hours, must unques 

 Uonably approach nearest to the true mean temperature of any 

 pTa e ler'e'a meteorological journal is kept,-a c-cumstance diat 



Sarrm:^^emp^.ur. By ^ 



yeTs "Xat ;: b1 itSS"-? a degree lower than the mean 

 ^f the LaSa and mimma or^daily extremes, for the same period 



"^ThTVearly mean state of De Luc's whalebone hygrometer indi- 

 cates that tlfe atmosphere was three-tenths of a degree drier than 



'" wfs^s -The scale of the prevailing winds shows that their con- 

 tinuance from the eastern side of the meridian is nearly equal to 

 those from the western side. This sometimes happens in compa- 

 raSely cold years, unless the North-wcst wind be of long dura- 



*'The continuance of the North-east wind is beyond all former 

 obsevaUon which appears to have lessened the duration of the 

 whd from t le opposite point. This circumstance may have caused 

 re'deficiencyin'^he mLn yeaily depth of rain, and the slow^eva- 



