METEOROLO(}ICAL OBSERVATORY 



OF THE 



Hatch Experiment Station 



MASSACHUSETTS AGRICULTURAL COLLEGE. 



.A.^^wd:£iEI^ST. 



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



Height of instruments above ground<,51ft. Above sea level, 273.5 ft. ** 



BULLETIN No. 109. 



JANUARY, 1898. 



MONTHLY SUMMARY. 



Prensure, In inches. 

 Maximum reduced to freezing, 30.27, 19th, IOa 

 Miuiinuui reduced to freezing, . 28.Sy,lst,0 \. 

 Reducedt ma.vimuin reading, 30. HI, 19ch,0A. 



Rtiducidt uiin. reading 29.18., 1st, Oa. 



Mean reducedf 29.97G 



Montlily range 1.41 



*.4.ir Tempei'atui'e, In Degrees Fahr. 



Highest 50.0; 13th, in a. 



Lowest, -15.5,30lh,6 a. 



Meaa 21.8 



Mean of means of max. and min., . . . .21.8 



Mean sensibleCwet bulb), 21.4 



Monthly llange, 65.5 



Ilighest mean daily, 37.8,21st 



Lowest uiean daily, -2.U, 3 .th 



Mean ma-viniuni 31.4 



Mean niiuiinum, 12 2 



Mean daily range ]:i.2 



Greatest daily range, 37.0, 3lsi 



Least daily range, 4.0, 22d 



Uutnldity. 



Mean dew point 18.4 



Mean force of v.'ipor, 139 



Mean relative humidity, 85.2 



Wind. 



Prevailing Direction, North West. 



Summary. 



North Northwest, 16 per cent. 



South West lu " 



WfSt North West 10 " 



North We.-t 23 " 



North, 10 " 



Other directions 31 " 



Total movement 3494 m. 



Greatest daily movement, . . . 317 m., 24tli 



Least daily movement 4m., 18th 



.Mean daily movement 113.0 m. 



Mean hourly velocity 4.7 m. 



Maximum pressure per squai-e foot, 22. 5 lbs = 



67 m. per hour, 12 .M., 3d, N.W. 

 frecip nation, lu inches. 



Total precipitation, 7.15 



Number o! ilays on which .01 inch or more 



rain or melteil snow fell, 13 



Snow total in inches, 33 



Weather. 

 Mean cloudiness observed,. . 66.0 per cent. 

 Total cloudiness recorded by the Sun Ther- 



mometer, . . . 162 hours or 55.0 per cent. 



.Number of clear days 6 



Numbcrof fair days 10 



Number of clouily days 15 



Jiriyht Sitnshine, 

 Number of Hours recorded, 132 hours or 45)i 

 /{«JH,()ih. 7th, 12th, 13th, 14th, 15th, 20th, 23d, 



2Mh, 2(llh. 

 Siioir, lsl,4lh, 14th, l.Mh, 20th, 22d, 23d, 25th, 



26th, 27lh, 2tth, 31st. 

 Hail, 31st. 

 &'«/»•/», of 35 or more iTiiles per hour, 49m., 



Isl, W.N.VV.;67m., 3.1, N.W ; 35 m., 7th, 



N \V.; 47m., «h, W s.\V.; 66 m., 2Uh, 



N.W.; 47m.. 3lst, N.W. 

 Snow on ground at end of month, 15 inches. 

 Days of sleighing, 31 for light sleighs, 30 for 



heavy. 



* Temperature in ground shelter. 



t Reduced to freezing and sea level. 



• * Determined from levels of B. & M. R. E. 



