| Day of the Month [July] | State of the ther- mometer at ☉rise | Weather at ☉rise | Wind at ☉rise | State of the Ther- mometer at 4 P.M. | Weather at 4 P.M. | Wind at 4 P.M. | State of the river raised Inches or & fallen Feet Parts | 
| 1st | 59 a | f | S. W. | 74 a | f. | S.W. | r ½ | 
| 2cd | 60 a | f a r | S. W. | 78 a | f. | S W | |
| 3rd | 58 a [2] | f | S. W | 74 a | c a f & r | S W | |
| 4th | 52 a | f | S. W. | 76 a | f a r | S. W. | f ¼ | 
| 5th | 49 a | f a h & r [3] | S W | 72 a | f | S W. | f ½ | 
| 6th | 47 a | c a h r T & L. | S. W. | 74 a | f a c | S. W | f ¼ | 
| 7th | 54 a | c. a. f. | S W | 77 a | r. a. c. | S W | f ¼ | 
| 8th | 60 a | f | S W. | 78 a | f. a. r. | S. W. | f ¼ | 
| 9th | 56 a | f | S W. | 76 a | c. a. r | N. W. | f ¼ | 
| 10th | 52 a | f a. r | S. W. | 66 a | f | S. W. | |
| 11th | 46 a | f | S W. | 70 a | f | S. W. | |
| 12th | 50 a | f | S. W. | 74 a | f | S W. | f ¼ | 
| 13th | 42 a | f | S W. | 76 a | f | S. W. | f ¼ | 
| 14th | 45 a | f | S W. | 78 a | c. a. r | S. W. | |
| 15th | 60 a | f. a. r. | S W. | 76 a | f | S W. | f 1 ½ | 
| 16th | 53 a | f | S W. | 80 a | f | S W. | f ¾ | 
| 17th | 58 a | f | S. W. | 81 a | f | S. W | f 1 ½ | 
| 18th [4] | 60 a | f | S W | 84 a | f | S W | |
| 19th | 62 a | f | S W | 68 a | c a h & r | S. W | f ½ | 
| 20th | 59 a | f a r | S W. | 60 a | f | N. W | |
| 21st | 60 a | f | N W | 67 a | f | N W | f ½ | 
| 22nd | 52 a | f | N W | 80 a | f | N. E. | |
| 23rd | 54 a | f | S W. | 80 a | c. | S W | f ½ | 
| 24th | 60 a | f | S W | 90 a | f | S. W. | f ¾ | 
| 25th | 60 a | f | S. W. | 86 a | f | S W. | f ½ | 
| 26th | 60 a | f | S W. | 82 a | C. a. r. | S W | f ¾ | 
| 27th | 52 a | C | S W | 80 a | C. a. r | S. W. | f ¾ | 
| 28th | 49 a | f. a. r | S W | 90 a | f | S. W. | f ½ | 
| 29th | 54 a | f. a. r | N. | 82 a | f | N. E. | r ½ | 
| 30th | 50 a | f | S. E. | 80 a | f | S. E. | |
| 31st | 48 a | f | S W. | 92 a | f | S. W. | 
| [July] | 1st | wind hard during greater part of the day.— | 
| 2nd | some rain just before sun rise | |
| 3rd | slight rain in the evening. | |
| 4th | heavy dew this morning. slight sprinkle of rain at 2 P. M. [6] | |
| 5th | heavy shower of rain and hail last evening at 9 P. M.    some thunder & L[ightning] | |
| 6th | wind high all day. [7] A heavy wind from the S. W. attended with rain about the middle of the last night. about day had a violent thunderstorm attended with Hail and rain. the Hail Covered the ground and was about the Size of Mus- quet balls. I have Seen only one black bird [8] killed with the hail, and am astonished that more have not Suffered in a similar manner as they are abundant, and I Should Sup- pose the hail Sufficiently heavy to kill them. | |
| 7th | a Shower at 4 P. M. | |
| 8th | I finish taking the hight of the falls of the Missouri [9] | |
| 10th | wind hard all day. [10] | |
| 11th | wind hard all day | |
| 12th | wind violent all day. | |
| 13th | Wind violent in the latter part of the day | |
| 15th | Set out from our upper camp above the falls [11] | |
| 18th | I set out in Search of the Indians [12] | |
| 19th | Thunder Storm ½ after 3 P. M. | |
| 22nd | overtake Capt Clark [13] | |
| 23rd | he sets out again this morning | |
| 25th | Snow appears on the mountains ahead. | |
| 27th | a considerable fall of rain unattended with Lightning. Capt Clark rejoins me [14] | |
| 30th | Set out from 3 forks [15] |