BULLETIN No- 5, MAY, 1889. 



METEOROLOGICAL OBSERVATORY 



OV TlIK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



Height of iyistruments above ground^ 51 ft. Above sea. level. 260 ft. 



MONTHLY SUMMARYb 



Pressure. In inches. Actual maximum reading 30.110; Mean reduced to ^2-^ F., 2n.(i-2(!; 

 Monthly Uange, 0.S3G. 



Air Tnnperature. In Degrees Fahrenheit. Mean, 61.4''; Highest, 88.0'^; Lowest, 40.0°; 

 Monthly Range, 48.0«; Highest Mean Daily, 73.0^\ Lowest Mean Daily, 4(;.9>-"; Mean Maxi- 

 mum, 71.4-'; Mean Minimum, .51.0'^; ]Mean Daily Range, 19.7'^; Greatest Daily Range, 33.0°. 



nutnlditij. Mean Dew I'oint, .'52.8'^; Mean Relative Humidity, 73.8«; Mean Force of Va- 

 por, .5801. 



Wind. Prevailing Directions, N. and S.; Total Movement, 4056 miles ; Greatest Daily 

 Movement, 405 miles, 31st ; Least Daily Movement, .55 miles, 12th ; Mean Daily Movement. 

 130.8 miles, .Aleati Rourly Velocity, 5.5 miles; Maximum Pressure per Square Foot, 9 lbs. 



Precipitation. In inches. Total Precipitation, 4.71. 



Jirlijht Sunshine. Number of Hours Recorded, 270. 



Weather. Mean Cloudiness, on a Scale of 10, 4.2; Number of Clear Days, 13.; Number 

 of Cloudy Days, 4; Number of Fair Days, 11; Total Cloudiness recorded by the Sun 

 Thermometer, 168 hrs, or 38 jier cent. 



Frost, in low lands, on the night of SOth. 



Thunder and Lightning, 10th, 14th and 24tli. 



DAILY SUMMARY- 



May 1 . Barometer reduced to 32° F., max. 29.040, min. WJM\, mean 2i).ni4. 

 Temperature, max. 53", min. 41°, mean hourly 4(i.!)°. 

 Hun Thermometer, max. 119°, 9 a. m., briccht sunshine 10 hrs. 

 Mean humidity 61°, mean force vapor .'324.5, mean dew point 34°. 

 "Wind, N. W., total movement, 130 m., mean hourly velocity, 5.8 

 m., max. pressure, 8 lbs., 4 a. m. 



2. Barometer reduced to 32° F. , max. 29. r.r.r,, min. 29.552, mean 29.010. 

 Temperature, max. 58^, min. 38°, mean hourly 48.3''. 



Sun Thermometer, max. 140°, 12 m., briylit sunshine 11 hrs. 

 Mean humidity 08.3°, mean force vapor .3(US, mean dew point 39.3^'. 

 Wind, W., total movement 00 m., mean hourly vel. 3.7 m., max. 

 pressure 4 1-2 lbs., 3 p. M. 



3. Barometer reduced to 32° F. , max. 29.580, min. 29.523, mean 2!).5(:0. 

 Temperature, max. 54°, min. 44°, mean hourly 48.5°. 



Snn Thermometer, max. 131°, 12-30 p. m., bright sunshine 9 hrs. 

 Mean linmidity 74.3", mean force vapor .3447, mean dew point 40.3°. 

 Wind, N. NW., total movement 114 m., mean hourly vel. 4.7 m., 

 max. pressure 3 1-2 lbs, 1-30 v. m., Ozone 1. 



4. Barometer reduced to 32° F., max. 20.(508, min. 20.589, mean 20.010. 

 Temperature, max. 03°, min. 40°, mean hourly 52.7°. 



Sun Thermometer, max. 130°, 9 a. m., bright sunshine 11 hrs. 



