BULLETIN No. 4, 



APRIL, 1889. 



METEOROLOGICAL OBSERVATORY 



OK THE 



Hatcli Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 4S.5" N. Longitude, 72° 31' 10" W. 



Height of instruments above groxind, 51 ft. Above sea level, 260 ft. 



Pressure. In inches. Actual maximum reading 30.230; !Mean reduced to 32" F., 29.495; 

 Monthly Range, 1.17G. 



Air Temperature, in Degrees Fahrenheit. Mean, .50.8^"'; Highest, 78.0"; Lowest, 30.0"; 

 Monthly Kange, 48.0«; Highest Mean Daily, 61.1"; Lowest Mean Daily, 34.4"; Mean Maxi- 

 mum, :^6.^V^^, Mean .Alinimum, 4.5.6"; Mean Daily Range, 13.1"; Greatest Daily Range, 35.0". 



Butnidity, Mean Dew Point, 43.8; Mean Relative Humidity, 78.3; Mean Force of Vap- 

 or, 33.98. 



Wind. Prevailing Direction, X. ; Total Movement, 5648 miles; Greatest Daily Move- 

 ment, 348 miles, 8th; Least Daily Movement, 56 miles, 5th; Mean Daily Movement, 202 

 miles. Mean Hourly Velocity, 8.4 miles ; Maximum Pressure per Square Foot, 15 1-2 lbs. 



Precipitation. In inches. Total Precipitation, 2.87; Total Depth of Snow, 1-2. 



Bright SitnsJiine. Number of Hours Recorded, 191. 



Weather. Mean Cloudiness, on a Scale of 10, 5.5; Number of Clear Days, 10.; Number 

 of Cloudy Days, 11.; Number of Fair Daj's, 9.; Total Cloudiness recorded by the Sun 

 Thermometer, 195 hrs, or .55 per cent. 



HOURLY READINGS FROM THE 



DRAPER SELF-RECORDING THERMOMETER. 



IN THE SHADE. 

 rA-tlREKTiUSIT X3EC3-K.EES. 



Day. 



9 

 10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 

 22 

 23 

 24 

 25 

 26 

 27 

 28 

 29 

 30 



12 3 4 5:6 



33 33.33 

 ai 34 34 



40J39 37 

 3637 37 

 373737 

 .391.3937 

 32 32 31 

 37 37 37 

 39 37 36 

 43 43 41 

 40'40 37 

 5151 51 

 47 46 44 



34 34 33 

 371.35 34 

 36 35 34 

 40139 39 

 .50 '50 50 

 .54 .53 .53 

 57 1 .56 .55 

 .58 58 57 

 42 41 40 



35 34 34 

 42 42 42 

 54 55 55 

 59 59 59 

 54 54 53 

 .53 .52 51 

 .50149,48: 

 4747:461 



8 9 10 11 12 1 



.33 33 

 .3434 

 37 37 



38.38 

 37 37 

 .35 34 

 .30 31 



36 36 38 

 35:'.5!:5(; 

 40 30 41 

 35 .34 1 36 

 .50 50 .50 

 43 42 41 

 33 34 36 

 33 32 1 35 

 ,33 33 35 



37 .36137 

 ' 50 j. 50!. 50 

 52 .53.53 

 .541.54 .58 

 .56 1 56 59 

 40 36 42 

 34:3741 

 42! 42 46 

 55 .55 57 

 .59;. 59 .59 

 .53 .53 .53 

 51 51 .52 

 48 j 48 49 

 46 46 46 



34 34 34 



135:36 37 

 '41 42 45 

 40 42 44 

 ,38 4(1 43 

 42 43 45 

 'Mr. 40 45 

 42 46 48 

 42 47 5(1 

 45 4f^ 4',i 

 42 47 54 

 .5.3 56 .5!) 

 42 43 4(5 



39 42 44 

 40;45 48 



40 ,50 .54 

 4;3!49.52 

 5li.54 .56 

 561.59 65 



60 65 71 

 60 '62 65 

 44 44 45 

 43,45 49, 

 .50 '.53 56 

 60i64 66; 



61 62 62: 

 .56.56 60 1 

 .53.53 .541 



3 4 



35 35 35 36 36 

 39 40 42 43 45 



45 43 41 40 41 

 45 4S 4s 49 49 

 45 46 47 47 47 

 4(i 47 47 4s 49 

 47 47 4> 4,^ 49 

 .5(1 51 .53 54 54 



54 :.(;:.'.•.;(! ci 



36 36, 

 45 45, 



41 40 

 49 47 

 47 46 

 4,^ 49 

 4'.i 48 

 54 52 



8 9 lOjll 12i Mean. 



6(1 >'■^ 60 61 (11 

 48 49 51 51 51 

 46,48 .50 .50 51 

 51 53 56 57 58 

 .56 .58 59 59 1 59 

 .55 1.57 57 1 57:. 58 

 .571.59 60 r,() 61 

 70:72 74 76 77 

 73I74 74 7(i 75 

 (JS 72 41 > 74 76 

 46 47 .55 49 4;i 

 .54 .54 56 57 



62 (U (i5 65 

 68 69 (;'.) CS 

 65 67 (;7 66 

 60 62 61 Cd 



.56 :,i; :,: :,: 



61 59 



511 50 

 .52 51 

 59|.59; 

 59;. 56 

 .58 56 



62 62 



C.'i ()3 

 75 60 

 4:) 49 

 57 57 



63 62 

 6> 67 



64 (;o 



.36 36 35; 

 42 4i:40 



40 39 3s 

 45 44 4:; 



45 44 43 

 48 47 44 



46 43 41 

 51 49 4(; 

 CO .57 :4 

 .54 .52 .".II 

 (;3 o'.. 57 

 59 57 56! 



47 43 40 

 59 48 46| 

 ,581.54:51' 



54 .521.50' 

 53 .52 .52 

 64 '(!2 60 

 75 70 67 

 63 63 63 

 57 .54 .50 

 46 14 42 



55 50 48 

 6(1 59 57 

 66 iA 61 

 57 56 .55 



.35134 34:34 



40:40'40'4I 

 3s 3S 3s 37 

 41 4(1 3s 3 

 43 42 41 40 

 43 42 38 35 

 39 38 37 '3' 

 45 43 42 1 40 

 5r.50 49l48 

 4 7 46 45 43 

 54 53 



01 olj ■^■l .j->.< 

 .51 51 .521.53 .52 . 



I 60 :>'.) 5!) 

 ■ 57 57 5(1 

 55,53 51 



i|4948,48 



53 50 



38J37 



42|41 



46 45 42 

 471474443 

 51j51 51 50 

 59I.58 57|.56 

 66 6462,60 

 62,62 61 60 

 47146 46 44 

 4140 38 37 



46 45 44 44 

 56 56 55 54 

 .59 '.59 '.59 59 

 55 .55 55 .54 

 5s 57 .56 .55 

 :<:• 54 53 .52 

 49 48,47,47 



47 46 4645 



34.4 

 38.7 

 39.8 

 42.1 

 41.8 

 42.5 

 39.9 

 44.8 

 49.1 

 47.8 

 52.3 

 55.1 

 44.7 

 42.6 

 46.4 

 47.1 

 48.8 

 56.1 

 64.1 

 63.3 

 59.7 

 43.5 

 46.1 

 .53.9 

 61.5 

 59.9 

 57.1 

 54.3 

 52.0 

 48.2 



