BULLETIN No. 241. 



JANUARY, 1909. 



Meteorological Observations 



AT thp: 



MASSACHUSETTS 



AGRICULTURAL EXPERIMEFr 



STATION. 



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



Height of barometer above ground, 51 ft. Above sea level, ^73-5 f^- 

 Height of Wind Instniments 72 ft. 



MONTHLY SUMMARY. 



, freasnre. \\\ inclies. 



Miixiimim reduced to freezing, 30 42, Stii, S A. 



i6th, 7 P. 

 Minimum reduced to freezing, 28.80, 30th, 2P. 

 Reduced! niaximuni reading, 30.75, 8th, 8 ^_ 



16th, 7 P. 

 Reducedt niininiinn reading, 2g.11, 30th, 2 p. 



Mean semi-daily reduced 30.14S 



Montlily range 1.64 



*.4.ir Teitiperatiire. In Degrees Fahr. 



Highest 54-0, 5th, 4P- 



Lowest —7-0, 19th, 8 a. 



Mean hourly, 25.7 



Mean of means of max. and min., .... 25.4 



Mean sensible (wet bulb), 22.8 



Montlily range 61.0 



Highest mean daily 45-3. 5tli 



Lowest mean daily 5.3, 19th 



Mean niaximuni 34.4 



Mean nimimuni 16.4 



Mean daily range, 18.0 



Greatest daily range 33.0, 6th 



Least daily range, 6.0, 23d, 24th 



Hiitnidittf. 



Mean dew point 19 



Mean force of vapor, 145 



Mean relative humidity, 78.5 



yrecipitation. In inches. 



Total precipitation, 3.56 



Number of days on which .01 inch or more 



rain or melted snow fell, ■ 10 



Total snow in inches, S 



Wind. 



Total movement 3991 m. 



Greatest daily movement, . . . 342ni., 26th. 



Least daily movement , 36ni., 23d. 



Mean daily movement, 193 ni. 



Mean hourly velocity, 8.0 ni. 



Maximum pressure per square foot, 8.5 lbs.= 



41111. per hour, 2Sth, 6p., W.N.W. 

 Maxiiiiuni velocity for 5 minutes, 36ni. per 



hour 28th, i2P., N.W. 

 Prevailing Direction, West. 

 Sunimary. 



North Northwest 19 per cent 



South Southeast 16 " " 



Northwest 13 " " 



West Northwest 13 " " 



West Southwest 10 "' " 



South, 10 " " 



Other directions, 19 " " 



Weather. 

 Mean cloudiness observed, .... 61 per cent- 

 Total cloudiness recorded by the Sun Ther- 

 mometer, i66hrs.= 56 per cent. 



Number of clear days, 8 



Number of fair days, 9 



Number of cloudy days, 14 



Rrlght Sutishine. 

 Number of hours recorded, . . 127 hrs. = 44f« 

 Rnin, ;d, 4th, 5th, 6th, 9th, loth, 12th, 14th, 



23d, 24th, 2;tli. 

 Tlmiuler and I^iffhtning;, 24th. 

 Snow, qth. 12th, 13th, 14th, lOtli, 17th, iSth, 

 2;th, 26th. 27th, 29tli, 30th. 



Days .■Sleighinjj 20 



6alen, 35 miles or more per hour; 35m., 

 8th.. N.N. W.: 40m., iSth, N.N.W.: 37m., 

 26th, N. W.: 41m., 2Sth., W. N. W.; 35m., 

 30th, N.NW. 



* Temperature in ground shelter. 

 t Reduced to freezing and sea-level 



