40 MASS. EXPERIMENT STATION BULLETIN 402 



as these stations are much higher than the others, its use probably is a sampling 

 of upper-air conditions. It loses its value entirely in the fall. This suggests a 

 shift in dominating influence from that of upper-air humidity to that of humidity 

 near the ground. 



6. The increased value in the fall of the wet-bulb temperature alone at noon 

 and of the dew point alone in the evening seems to reflect a relation between the 

 importance of humidity and the length of the night. 



7. Dry-bulb temperatures near the coast are more closely related to ensuing 

 minimum bog temperatures in spring to early fall than those inland. ^^ 



8. The evening wind velocity at Worcester, Paxton, and Pittsfield is an item 

 of special interest. It seems to be a good measure of the general atmospheric 

 circulation, probably because of the elevation and distance from the sea. 



^^The evening temperature at East Gloucester has a little closer relation than that at East 

 Wareham, but the latter may be used for the former on occasion. 



Formulas for Reckoning Minimum Bog Temperatures at Noon 

 (Eastern Standard Time) 



Let: T be the minimum bog temperature to be computed, 



DEW the shelter dry-bulb temperature at East Wareham, 

 WEW the shelter wet-bulb temperature at East Wareham, 

 WBH the shelter wet-bulb temperature at Blue Hill Observatory, 

 WW the shelter wet-bulb temperature at Worcester, and 

 X the average between the wet-bulb temperatures at East Wareham and 

 Worcester. 



Then: 



In April (last third) T = DEW + WEW -f 18 or X - 8 



6 2 



In May (1st half) T = DEW + WEW + 38 or X - 1 



6 2 



In May (last half) T = DEW + WEW + 5 4 or X -f 4 



6 2 



In June T = DEW -f WEW + 66 or WBH + 9 or WEW + 7 



6 2 2 



In late August and September 



(1st half) T = DEW -f WEW + 52 or WBH + 5 or WEW + 3 

 6 2 2 



In September (last half) T = WBH + 3 or W^EW - 1 or WW + 1 



2 2 2 



In October (1st half) T = WBH + 1 or WW - 1 



2 " ■ 2 



In October (last half) T = WBH - 1 or WW - 3 



2 2 



Formulas using East Wareham data alone are given (for both noon and evening) 

 where they have proved satisfactory. Their forms probably may be used with local 

 data in many places in the Cape cranberry district. 



