METEOROLOGICAL OBSERVATORY 



Ilatcli Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of barometer above ground^ olft. Above sea level, 273.5 ft. 



Height of Wind Instruments 72 ft. 



BULLETIN No. 121, 



JANUARY, 1899. 



MONTHLY SUMMARY- 



Pressure. In inches. 

 Maximum reduced to freezing, 30.57, 2d, 9A. 

 Minimum reduced to freezing, 28.91, 25tli, 3a. 

 Reducedf maximum reading, 30.92, 2d, 9A. 



Reducedt min. reading 29.22, 23tli, 3A. 



Mean tri-daily reducedt,. 30.113 



Monthly range, 1.70 



*.-lir Temperature. In Degrees Falir. 



Higliest 49.0, .5th, 11 A. 



Lowest —21.5, 2d, 6a. 



Mean hourly 23.3 



Mean of means of max. and min., .... 22.9 



Mean sensible (wet bulb), 21.6 



Monthly Range, 70.5 



Highest mean daily, 43.1,5th 



Lowest mean daily 0.8, 2d 



Mean maximum, 32.6 



Mean minimum 13.3 



Mean daily range, 19.3 



Greatest daily range 37.0, 20th 



Least daily range, 8.5, 6th 



Humiditji. 



Mean dew point, IP. 6 



Mean force of vapor, 141 



Mean relative humidity, 77.7 



Precipitation. In inches. 



Total precipitation 2.80 



Number of days on which .01 inch or more 



. rain or melted snow fell, 8 



Snow total in inches - 



Snow on ground at end of mouth . . . Trace 



Wind. 



Total movement 4926 m. 



Greatest daily movement, . . . 392 m., Ist 



Least daily movement, 11m., 12th 



Mean daily movement 159 m. 



Mean hourly velocity, 6.6 m. 



Maximum pressure per square foot, 201bs = 

 Wm. per hour, 27th, 12m., N.W. 

 Prevailing Direction, West North West. 

 Summary. 



North, 10 percent 



.South, 16 " " 



West 26 " " 



North West 19 " " 



Other directions 23 per cent. 



Weather. 

 Mean cloudiness observed, . . 53.0 per cent. 

 Total cloudiness recorded by the Sun Ther- 

 mometer, ... 143 houi-s or 49.0 per cent. 



Number of clear days, 9 



Numberof fair days, 9 



Number of cloudy days 13 



KrigJtt Sunshine. 

 Number of Hours recorded, 151 hours or 51^ 

 Rain, 0th, 13th, 14th, 16th, 17th, 24th, 25th. 

 Sleet, 6th, 13th, 24th. 

 Snow, lst,6th, 9th, 13th, 14th, 25th. 

 Thunder and Lightntag, 24th. 

 Corona, 26th. 



No. days sleighing, ■ 13 



Gales, of 35 or more miles per hour, 44m., 

 1st, N.; ryhn., 7th, N.W. ; .3,'5m., 11th, N N.E.; 

 41m., 14th, N.W. ; eOm. ,15th, N.W. ; 42m. ,25th, 

 N.W. ; 64m., 27th, N.W. 



* Temperature in gi-ound shelter, 

 t Reduced to freezing and sea level 



