Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean: Vol. 1, Pt. 2

600
METEOROLOGICAL OBSERVATIONS.
Daily and Jlonthly Barometric Means at Columbia Barracks, 1853.
Observations at sunrise, 9 a. m., 3 p. m., and 9 p. m. Readings corrected to 32~.
September.
]................................
2................................
3......~...........................
4.................................
4................................
6.................................=
7..................................
9......................0..
0.......,.........................
6 —-------------.912.91.049.........816....
------------------- ----------- - - -
14.......................
]6.................................
18................................
19..........................
o-........................
21...............................1..
12........................6.........
13......................
14.................................
12....... —.........................
27...............,~.
128.................................
129..........00.7.......
30.................................
2 1- 2982 2995.874 - -6.78
-22 —--------------------.82.86.79.17 30.165
263.oo - - ---- --------- - - - - 3003.87 -71.01 2990
24... —------------ 2.99.83.732.84.8.............
27. —---------- -.85 - ~3 92 3004.3 ZZ94-@*w
29.......m.835 - 79 29.947.18
30....................90.77.91.
31....-.014.834.235
Monthly mean at sunrise..............8
Monthly mean at 9 a. m..............
Monthly mean at 3 p. m..............
Monthly mean at 9 p. m..............5
Mean...................
Mean for 131 days, 29. 939 inches. Altitude of Columbia Barracks, 57.6 feet.
* A remarkably low point, occurring at all Pacific stations. Two observations only, at sunrise and 9 a. m.
No.
July.
August.
October.
November.
30. 051
.097
.037
29. 960
. 981
. 971
30. 016
.098
.119
29. 951
.799
.804
. 924
.. 843
.782
. 919
. 907
. 952
.985
30-047
29-957
. 863
.874
. 873
. -. 836
.818
. 840
.837
.797
.775
.834
!29. 818
.709
. 891
30. 150
.. 034
29. 951
.847
729
.757
. 882
30. 003
29. 741
732
558
532
642
824
30. 043
29. 974
908
874
796
710
.753
.925
.876
. 883
30. 010
29. 947
. 914
30. 026
.036
29.968
. 915
30. 031
.049
29.897
. 843
.652
.728
672
989
30. 075
29. 908
921
902
823
30. 009
.137
6 275
.164
.175
. 012
29.874
30. 047
29. 936
30. 183
.253
.198
. 080
.235
30.185
.150
.271
.205
29.880
. 816
. 913
30. 013
29.934
.709
.916
.687
. 810
30.116
.120
29. 904
.817
.738
.772
.824
.787
30.165
29.905
.814
. 394
*. 134
30-082
'010
29. 822
'829
30'037
29. 989
..855
.807
.845
. 864 t,
. 835
.980
30. 014 -
29. 951
29. 940
29.887
29.905
29. 940
29. 947
29.886
29. 897
29.866
29. 854
29.826
29.842
30. 103
30. 101
30. 098
.30. 098
29. 8.78
29. 870
29. 924
29.925
29.921
29.917
29. 847
30. 100
29.899