BULLETIN No. 381. 



SEPTEMBER. 1920 



Meteorological Observations 



^"^ ^'"^ LI3T?.ATR^.^ of 



MASSACHUSETTS ]VIa«.«^clrci^et 



AGRICULTURAL EXPERIMEff ^"^^20 



STATION. 



Co. 



Latitude, 42° 23' 48.5" N. Longitude 72* 31' 10" W. 



Height of barometer above ground, jr ft. Above sea level, 2yj.^ ft. 

 Height of Wind Instruments J2 ft. 2'ime used, 'j^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.07, 22d, 9 A 

 Minimum reduced to freezing, 29.05, 30th, 12 P 

 Reduced maximum reading . 30.37, 22d, g a 

 Reduced minimum reading, 29.35,30th, 12 p 



Mean semi-daily reduced 29.990 



Monthly range 1.02 



*Air Temperaiure. In Degrees Fahr 



Highest 90.0, 26th, 4:30 P 



Lowest 37.0, 20th, 6 A 



Mean hourly 62.8 



Mean of means of max. and min 64.1 



Mean sensible (wet bulb) 57.4 



Monthly range 53.0 



Highest mean daily 70.2. 26th 



Lowest mean daily ....... 5' -Si 20th 



Mean maximum 75.7 



Mean minimum 52.4 



.Mean daily range 23.3 



Greatest daily range 36.0, 4th 



Least daily range 6.0, loth 



Humidity. 



Mean dew point :;5.5 



Mean force of vapor 541 



Mean relative humidity 83.9 



Precipitation. In inches. 



Total precipitation, in inches 6.74 



Number of days on which .01 inch or more 



rain fell 12' 



•Temperature in ground shelter. 

 ••Reduced to freezing amd sea-level. 



Wind. 



Total movement 341 1 m 



Greatest daily movement 292m, 17th 



Least daily movement i6m 25th 



Mean daily movement 114m 



Mean hourly velocity 4.Sm 



Maximum pressure per square foot, 6.0 lbs = 



35m per hour, 30th, 7P, S. 

 Maximum velocity for 5 minutes, 36m per 



hour, 30th, 7P, S. 

 Prevailing direction, West Southwest. 



Summary. 



South Southwest 10 per cent 



South 13 ■' " 



North Northeast 13 " " 



North 10 " " 



South Southeast i/ " " 



Other directions 37 " " 



Weather. 



Mean cloudiness observed .... 52 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 130 hours = 35 per cent. 



Number of clear days 8 



Number of fair days 17 



Number of cloudy days 5 



Bright Sunshine. 



Numter hours recorded, 243 hrs, 65 = per cent. 

 Rain, ist, 2d, 6th. '7th, 10th, 12th, 13th, 



16th, iHth, 27th, 2Sth, 30th. 

 Thunder and Liiihtuin^, 12th, 13th, 30th. 

 Gales. 35ni, 30th, S. 



