BULLETIN No. 18. JUNE. 1890 . 



METEOROLOGICAL OBSEHVATORY 



OK TllK 



Hatch Experiment Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



Latitude, 42° 23' 48.5" N. Longitiule, 72° ;3T-11j" W. 



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



MONTHLY SUMMARY, 



Hressiife, In inches. Actual maximum reading ;>().000; actual niinimuni reading •29.4-25; 

 Mean reduced to sea level, 2!i.i)7o; Monthly Hange, ..^T.^i in. 



*Air Temperature. In Oegrees Fahreuhcit. Highest, SG^; SS''; Lowest, 43.0"; 40. .5^'; 

 Mean, G(j..j^'; (i.^.S"" ; Jlonthly Kange, 43.*, 47..i'-'; Highest Mean Daily, 75.9", 7().5>^; Lowest Mean 

 Dailv, 51.9-\ .T2.0'-"; Mean Maxiniuhi, 75.7'^, 77.6°; Mean Mininnuii, SSC^, 52.9"; Mean Daily 

 Range, 20.1", 24.7"; Greatest Daily Range, 33.5"; 39.5". LeaslfDaily Range, 8.5" ; 10.5". 



Ifiimiditi/. Mean Dew Point, 57.9"; Mean Force of Vapor, .7184; Mean Relative 

 Humidity, 713. - . ' • ' 



ir/iirf. Prevailing Directious, N- 17 per cent., S. 12 per cent., S.S.W. II -per cent.t 

 S. E. 10i)er cent., other directions 50 per cent.; Total M-ovfement, 377G miles; Greates, 

 Daily JMovement, 209 m., 9th ; Least Daily Movement, 29 m;- 15th ; Mean Daily Movement 

 125.9" miles; Mean Ilourlv Velocity, 5.2 miles; Maximum Pressure per Square Foot, 10 

 lhs.=45 ni. per hour, 27th', at 9-30 a", m. 



Precipitation. In inches. Total Precipitation, 1.42 in.; at base of tower 1..53 in. 



Weather. Mean Cloudiness observed, 49.9 percent; Number of Clear Days, 15; Number 

 of Cloudy Days, 8; Number of Fair Days, 7; Total Cloudiness recorded by the Sun 

 Thermometer, 184 hrs., or 41.0 per cent. Number of days on which .01 inche."? or more rain 

 fell, 8. 



liriffht Sunahiite,. Number of Hours Recorded, 264. 



Mean Ozone, 22.8 per cent. 



Hrefo.s, Solar, lOth. Lunar Corona', 1st, 27th. 



Thunder and Lif/htniny, 4th, 5th, Gth, 11th, 18th, 24th. Mainbou-s, I9tli, 22nd. 



DAILY SUMMARY. 



June 1. Barometer reduced to sea level, max. 29.88, miii. 29.78, mean 29.852. 

 ♦Temperature, max. 79*, 80°, 6 p.m., min. 48°, 41*^,5 a.m, mean hourly Go. 9°. 

 Sun Thermometer, max. 138"^, 10 a.m., bright sunshine 1-1 3-4 lirs. 

 INIean dew point 49", mean force vapor .7055, mean humidity 52. 

 "Wind, N.W., total movement, 114 m., mean liourly velocity 4.7 m., max. jn'es- 



sure, 3 3-4 lbs. =27 m. per hour, 10-30 a.m. Ozone 10. 



2. Barometer reduced to sea level, max. 30.075, min. 29.88, mean 29.977. 

 Temperature, max 73", 75. 5°, 3 p.m., min. 50. 5°, 45. 5°, 12 p. jr., mean hourly 62.8'' 

 Sun Thermometer, max. 118°, 10 a.m., l)right sunshine 13 hi's. 



Mean dew point 44'=, mean force vapor .6257, mean luunidity 48. 

 Wind, X.AV., total movement 171 m., mean hourly vel. 7.1 m., max. pressui'e 

 7 1-2 lbs.= 39 m. per hour, 5 p.m. Ozone 10. 



3. Barometer reduced to sea level, max. 80.17, min. 30.08, mean 30.132. 

 Temperature, max. 74", 75.5°, 2 p.m., min. 43°, 46.5°, 4a.m., mean hourly 60°. 

 Sun Thermometer, max. 134°, 10-30 a.m., briii'lit sunshine 11 hrs. 



Mean dew i)oint 49.3°, mean force vapor .6286, mean humidity 58. 



Wind, S.. total movement 94 m., mean hourly vel. 3.9 m., max. pressure 



3 lbs. =24 m.per hour, 4-30 p.m. . Lig-ht showers of rain fell between 5 p. 



M. and 7 p.ji. Only a trace of v^'ater fell. Ozone 30. 



*The first figures denote readings at top of tower, the second at base. 



