1 66 



CARNEGIE INSTITUTION OF WASHINGTON. 



Relative Humidity at Mount Wilson. 



month. 



I.. 



2.. 



3.. 

 4-. 

 5" 

 6.. 



7.- 

 8.. 



9" 



10.. 



II.. 



12.. 



13.. 



14.. 



I5-- 

 16.. 

 17.. 

 18.. 

 19.. 

 20.. 

 21.. 

 22.. 



23-- 



24.. 



25- 

 26.. 

 27.. 

 28.. 

 29.. 

 30" 



Si- 



Means. 



April. 



8 a. m. 



100 

 96 

 60 

 92 



63 



60 



29 



100 



100 



100 



46 



58 



6 p. m. 



85 

 100 



73 

 79 

 98 



65 



50 



68 



100 



100 



100 



36 



71 



77 



May. 



8 a. m. 



57 



34 

 46 



38 

 29 

 36 

 18 



15 

 22 



35 

 36 

 41 

 32 

 23 

 27 

 34 

 25 

 46 



41 

 42 

 28 

 37 

 38 

 100 

 100 

 37 

 38 

 23 

 14 

 30 



6 p. m. 



80 

 80 

 66 

 49 



38 

 40 



31 

 22 



24 

 41 

 38 

 54 

 40 

 64 

 29 

 19 

 38 

 66 



64 

 100 



45 

 43 

 32 

 50 

 100 

 48 

 38 

 33 

 15 

 47 

 35 



43 



June. 



40 

 39 

 39 

 24 

 20 

 27 

 29 



23 

 20 

 21 

 19 



52 

 32 

 34 

 33 

 32 

 31 

 56 

 45 

 40 



44 

 42 



30 



28 



27 

 42 

 35 

 30 



6 p. m. 



36 

 39 

 41 

 25 

 24 

 42 



41 

 29 



34 

 21 



17 



43 



42 



30 

 30 

 24 

 41 

 42 

 72 



53 

 43 

 54 

 32 

 27 

 25 

 36 

 35 

 3° 

 37 



July. 



a. Ml. 6 p. m. 



34 



34 

 23 

 30 

 38 

 34 

 45 

 49 

 33 

 42 



57 

 29 

 46 



25 

 30 

 50 



22 



21 



24 

 35 

 31 

 33 

 38 

 31 

 30 

 50 

 38 



33 



24 

 38 

 32 

 56 

 42 



43 

 iS 



24 

 40 

 22 



25 

 44 



16 

 24 

 19 

 42 



34 

 35 

 26 



50 

 27 

 50 

 32 



46 



August. 



8 a. m. 



22 

 22 

 29 

 32 

 40 



34 



64 



41 

 28 



30 

 53 

 61 

 67 

 54 

 37 

 40 



34 

 32 

 23 

 37 

 58 

 79 

 77 

 69 



67 

 40 



43 

 21 

 27 



14 



6 p. m. 



43 



27 

 33 

 30 

 40 



43 

 43 

 76 

 58 

 46 

 35 

 33 

 65 

 64 

 72 

 45 

 36 

 30 

 45 

 46 

 40 

 33 

 85 

 79 

 56 

 58 

 37 

 43 

 33 

 29 



14 

 31 



The marked dryness of the atmosphere on Mount Wilson during 

 the summer months may be best appreciated by comparing these 

 results with those obtained by the Weather Bureau at Washington 

 during the corresponding period. 



Relative Humidity at Washington. 



* Mean maximum and mean minimum humidity not determined. 



