330 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 90 



HELENA, UNITED STATES 



Lat. 46° 34' N. Long. 112° 4' W. IT = 4110 ft* 



PRESSURE AT STATION LEVEL: COR. TO 0° C. (32° F.) AND TO 



GRAV. AT 45° LAT. 



Means of |(6 h + 18 11 ) corrected to means of 24 hours, 105th meridian W. 



25 inches + 



M'ns 



.791 



.786 



.734 .732 



.768 



.766 



.842 



.838 .813 .831 .837 .822 



.797 



TEMPERATURE IN DEGREES F. 



Means of \ (daily Max. + daily Min.), corrected to 24 hours t 



M'ns 21.0 27.1 34.2 43.3 52.6 60.6 69.5 66.8 54.4 45.1 33.1 



22.8 



44.2 



TOTAL PRECIPITATION IN INCHES 



* Elevation changed to 4124 ft. beginning with March 1930. 

 t Temperatures in vol. 79 were also corrected to 24 hour means. 



