BULLETIN No. 374. 



FEBRUARY, 1920 



Meteorological Observations 



AT THE 



MASSACHUSETTS 



AGRICULTURAL EXPERIMENT 



STATION. 



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



Height (}/ Ihiro meter above ground, _5r ft. Above sea level, 2jj.^ ft. 

 Height of Wind Instriiments 22 ft. Time used, y^thMer. 



MONTHLY SUMMARY. 



Pressure. In inches. 

 Maximum reduced to freezing, 30.71, ist, 10 A 

 Minimum reduced to freezing, 28.89, 15th, 11 .-v 

 Reduced maximum reading . 31.05, ist, 10 A 

 Reduced minimum reading, 29.21, 15th, 11 a 



Mean semi-daily reduced 29.983 



Monthly range 1 



*Air Temperature. In Degrees Fahr. 



Highest 45.0, 18th, 2.30 P 



Lowest -18.0, ist, 7 A 



Mean hourly 21.3 



Mean of means of max. and min 21.3 



Mean sensible (wet bulb) 18.0 



Monthly range 63.0 



Highest mean daily 35.5. 18th 



Lowest mean daily -0.9, ist 



Mean maximum 30.9 



Mean minimum 11. 7 



Mean daily range 19.2 



Greatest daily range 35.5,28th 



Least daily range 3.5, 26th 



Humidity. 



Mean dew point 14.3 



Mean force of vapor 116 



Mean relative humidity 82.9 



Precipitation. In inches. 



Total precipitation, in inches 4.45 



Total snow, in inches 31.0 



Number of days on which .01 inch or more 



rain fell 15 



Days of sleighing, 29. 



•Temperature in ground shelter. 

 "Reduced to freezing and sea-level. 



Wind. 



Total movement 4791 m 



Greatest daily movement 45om, i6th 



Least daily movement 5m, loih 



Mean daily movement 165m 



Mean hourly velocity 5. ym 



Maximum pressure per square foot, 12.0 lbs = 



49m per hour, 15th, ip, W.N.W. 

 Maximum velocity for 5 minutes, 30m per 



hour, 27th, 4P, W.N.W. 

 Prevailing direction, West Northwest. 



Summary. 



North 17 per cent 



Northwest 17 



West Northwest 14 



South Southwest 14 



West Southwest 10 



Other directions 28 



Weather. 



Mean cloudiness observed .... 52 per cent 

 Total cloudiness recorded by the Sun 



Thermometer . . 82 hours = 28 per cent. 



Number of clear days 1 1 



Number of fair days 16 



Number of cloudy days 2 



Bright Sunshine. 



Number hours recorded, 214 hrs, = 72 per cent. 



Rain, 6th. loth, 15th, . 



Snow, ist, 5th, 6th, 7th, loth, 12th, 13th, 15th, 



19th, 2ist, 22d, 23d, 24th, 25th, 28th, 



2gtli. 

 Hail, 6th. 

 Gales, 49m 15th, W.N.W.: 



35111 27th, W. N. W. 



