METEOROLOGICAL OBSERVATORY 



OF TIIK 



Hatch Experiiiieiit Station, 



MASSACHUSETTS AGRICULTURAL COLLEGE, 



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



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



BULLETIN No 43. 



JULY, 1892. 



MONTHLY SUiniVlARY. 



Pressure. In inches. 

 Actual maxinuini reading, . . 30.22, 7tli, 8 A 

 Actual niiiiiuHiin reailing, . . 29.25, 3ril, 10 P 



Mean reiliK^Ml to sea level, 29. 988 



Monthly range, 97 



*Air Temperature. In Degrees Fahr. 



Highest m.^; 94. 



Lowest, 50. ; 42. 



Mean 72.1; G9.3 



Monthly Range, 43.5; .52. 



Highest mean daily, S2.5; 81. 



Lowest mean daily, 63.5; 58.5 



Mean maximum, 82.2; S3. 1 



Mean minimum, 61.5;, 55. 5 



Mean daily range, 20.7; 27.7 



Greatest daily range, 29. ; 35. 



Least daily range, 11. ; 12. 



H II ttt ill I ti/ . 



Mean dew point 60.9 



Mean force of vapor, 8.598 



Mean relative humidity, 65.6 



Wind. 



Prevailing Directions. 



South West 14 per cent 



South, Southwest, J3 " 



West, 12 " " 



South,) 11 " " 



Other directions, ,50 " " 



Total movement, 3365 m 



Greatest ilaily movement, .... 276 m., 16th. 



Least daily movement, 27 m., ,5th. 



Mean daily movement, 108 m. 



Mean hourly velocity, 4.5 m. 



Maximum pressure per square foot, 11^11)8.= 

 48 m. per hour, 4th, at 2-30 P. 



* Precipitation. In inches. 

 Total precipitation, 3.28; 4.41 



. ,35 per cent, 



12 



14 



Weather. 



Mean cloudiness obseryed. 



Number of clear days, . . 



Number of fair days, . . . 



Number of clouily days, 5 



Total cloudiness recorded by tlie Sun Ther- 

 mometer, . . . 185 hours or 40 per cent. 



Number of days on which .01 inch or more 

 rain fell, 9 



Uright Sunshine. 



Number of Hours recorrled 287 



Haiti, 1st, 3rd, 8th, 9th, 16th, 19th, 22nd, 2.5th, 



28th, 29th, 31. St. 

 Auroras, .... 16th, 17th, 20th, 24th, 25th. 



Rainbow 28tli. 



Thunder and TJ{/hfninff. 3rd, 13th, 14th, 



16tli, 22(1, 23d, 2(;tli, 28tli, 29th. 

 Mean Ozone, 33 per cent. 



Haloa. 



Solar, 21 St, 22nd, 24th. 



Lunar, 4tli,5tli. 



Coronae, 1st, 9th. 



G«7<>.s, of .50 or more miles per hour, . . . . 0. 



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



