so MASS. EXPERIMENT STATION BULLETIN 433 



average of the mean temperatures at New Bedford, Taunton, Middleboro, Ply- 

 mouth, East Wareham, and Hyannis in the 10-day period preceding the day of 

 the frost was 8.53°F. higher than is normal for the period; and the average of the 

 rainfall at these places during the 24 days before the frost was only .05 of an inch. 



FORMULAS FOR RECKONING MINIMUM BOG TEMPERATURES 



Further studies have produced additional material which is included in the 

 revision of the formulas for use in reckoning minimum bog temperatures with 

 the 7 p.m. weather data. The following should replace page 41 of Bulletin 402. 



Formulas for Reckoning Minimum Bog Temperatures at 7 p.m. 

 (Eastern Standard Time) 



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



DG the shelter dry-bulb temperature at East Gloucester, 



DW the shelter dry-bulb temperature at Worcester, 



DEW the shelter dry-bulb temperature at East Wareham, 



WW the shelter wet-bulb temperature at Worcester, 



GP the dew point at East Gloucester, 



EWP the dew point at East Wareham, 



WP the dew point at Worcester, 



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

 Worcester, and 



M the lowest of the dew points at Carlisle, East Gloucester, East Ware- 

 ham, and Worcester. 



Then: 



In April (last third) T = DG-H.5 M-f30 or X-2 or .29 (WW-fWP) 



6 2 



In May (1st half)_ T = DG + 1.5 M+45 or X+3 or .30 (WW+WP) 



6 2 



In May (last half) T = DG + 1.5 M+57 or X+7 or .31 (WW-fWP) 



6 2 



In June- T=^ DG + 1.5 M+64 or X+9 or DEW+EWP+7 5 



6 ' 1 6 



In late August and 



September (1st half) T = DG + 1.5 M+54 or X+7 or EWP +8 



6 2 2 



In September (last half) T = DW+GP + 11 or X+5 or EWP+6 



4 2 2 



In October (1st half) T = DW+GP+7 or X+3 or EWP +4 



4 2 2 



In October (last half)..._...T = DW+GP+5_ or X+2 or EWP +3 



4 2 2 



