Daily Observations at Hyslop Exp. Stn., Corvallis
July 2004
Bold = new daily record set (old record, year)
| Day | Max Temp (F) | Min Temp (F) | Precip (in) | 2 in soil Max | 2 in soil Min | 4 in soil Max | 4 in soil Min | Heating Deg. Days | Cooling Deg. Days | Growing Deg. Days | Evaporation (in.) |
| 1 | 84 | 48 | 0 | 102 | 70 | 94 | 71 | 0 | 1 | 16 | .300 |
| 2 | 81 | 46 | 0 | 103 | 69 | 95 | 71 | 1 | 0 | 14 | .281 |
| 3 | 81 | 57 | 0 | 100 | 69 | 90 | 72 | 0 | 4 | 19 | .215 |
| 4 | 79 | 50 | 0 | 98 | 68 | 89 | 71 | 0 | 0 | 15 | .209 |
| 5 | 79 | 50 | 0 | 100 | 68 | 93 | 68 | 0 | 0 | 15 | .242 |
| 6 | 83 | 52 | 0 | 101 | 69 | 93 | 71 | 0 | 3 | 18 | .397 |
| 7 | 86 | 53 | 0 | 104 | 72 | 95 | 73 | 0 | 5 | 20 | .311 |
| 8 | 75 | 46 | 0 | 97 | 67 | 90 | 71 | 4 | 0 | 11 | .301 |
| 9 | 75 | 40 | 0 | 98 | 67 | 91 | 69 | 7 | 0 | 8 | .298 |
| 10 | 76 | 49 | 0 | 95 | 70 | 88 | 72 | 2 | 0 | 13 | .226 |
| 11 | 75 | 48 | 0 | 93 | 66 | 87 | 69 | 3 | 0 | 12 | .249 |
| 12 | 82 | 58 | 0 | 98 | 66 | 91 | 68 | 0 | 5 | 20 | .295 |
| 13 | 91 | 55 | 0 | 106 | 72 | 97 | 73 | 0 | 8 | 23 | .448 |
| 14 | 85 | 51 | 0 | 105 | 73 | 97 | 76 | 0 | 3 | 18 | .230 |
| 15 | 86 | 50 | 0 | 103 | 71 | 95 | 75 | 0 | 3 | 18 | .464 |
| 16 | 84 | 52 | 0 | 103 | 71 | 94 | 73 | 0 | 3 | 18 | .297 |
| 17 | 88 | 54 | 0 | 108 | 73 | 98 | 75 | 0 | 6 | 21 | .303 |
| 18 | 88 | 51 | 0 | 98 | 71 | 90 | 75 | 0 | 5 | 20 | .319 |
| 19 | 89 | 55 | .04 | 106 | 71 | 97 | 74 | 0 | 7 | 22 | .373 |
| 20 | 82 | 60 | 0 | 102 | 74 | 94 | 76 | 0 | 6 | 21 | .255 |
| 21 | 82 | 57 | 0 | 103 | 73 | 95 | 77 | 0 | 5 | 20 | .376 |
| 22 | 88 | 57 | 0 | 103 | 73 | 96 | 76 | 0 | 8 | 23 | .400 |
| 23 | 98 | 62 | 0 | 105 | 73 | 98 | 76 | 0 | 15 | 30 | .676 |
| 24 | 103 | 57 | 0 | 112 | 78 | 102 | 80 | 0 | 15 | 30 | .419 |
| 25 | 100 | 52 | 0 | 111 | 75 | 103 | 80 | 0 | 11 | 26 | .416 |
| 26 | 88 | 50 | 0 | 105 | 72 | 98 | 77 | 0 | 4 | 19 | .367 |
| 27 | 86 | 50 | 0 | 104 | 72 | 96 | 75 | 0 | 3 | 18 | .338 |
| 28 | 91 | 53 | 0 | 106 | 73 | 98 | 76 | 0 | 7 | 22 | .348 |
| 29 | 92 | 52 | 0 | 108 | 74 | 99 | 79 | 0 | 7 | 22 | .318 |
| 30 | 91 | 53 | 0 | 108 | 74 | 99 | 79 | 0 | 7 | 22 | .321 |
| 31 | 84 | 50 | 0 | 105 | 73 | 97 | 78 | 0 | 2 | 17 | .365 |
| Average/Total | 85.5 | 52.2 | 0.04 | 102.9 | 71.2 | 94.8 | 74.1 | 17 | 143 | 591 | 10.357 |
| Departure | 5.3 | 1.2 | -0.48 |   |   |   |   |   |   |   |   |