Table 8. — Columbia River at Umatilla, Oregon 



Avsragi? ir.ontlily water temperatures °F., 19Uli-1955. 

 Data from U. S. Fish and Wilrilife Servj.ce and U. S. Corps of Engineers 



Tear Jan. Feb. Mar. Apr. Hay June July Aug. Sept. Oct. Not, Deo. 



19iai — __ «. 67oO 68.8 — — — _ 



19U5 — 57.8 6U.8 68.3 -^ 



19l;6 — — — — — 58.6 63.8 68.1 6JioU — — 



19U7 - — 58.9 65.0 67.0 6U.7 — — — 



19U8 -. — — — 67.1 — — ~ — 



19U9 -- 53.U 56.7 63.9 66.9 63.7 ~ — — 



1950 35.5 36.5 h2,h U7.1 51.9 55.6 63.0 67.5 65.3 57.U U9o5 Uh,3 



1951 Uo.l 39.1i la.6 li9.5 53.5 58.5 63.U 67.I 6U.U 57.5 U8,3 39.9 



1952 36.2 37.7 la.h U9.7 53.3 58. U 6U.8 67.2 6U.9 60.O U9.6 Ui,0 



1953 li2.9 Ii2,2 Uto2 U6.6 — 56.7 62.8 67.6 61;.9 58.9 — hh.7 

 195U 39.1 39.9 U2.9 17.9 52.3 55.U 60,2 63.7 63.2 55.5 50.6 



1955 39.2 39.0 39.3 ii5.2 51.7 56.1 59.6 66.0 6U.7 57.8 50.9 



ATg. 



1950-55 38.8 39.1 la.9 U7.7 52.5 56.8 62.3 66.5 6U.6 57.8 1^9.8 U3.2 



U7 



