Daily Observations at Hyslop Exp. Stn., Corvallis
October 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 | 68 | 43 | .01 | 73 | 56 | 68 | 59 | 9 | 0 | 6 | .116 |
| 2 | 72 | 42 | .01 | 78 | 55 | 70 | 58 | 8 | 0 | 7 | .126 |
| 3 | 76 | 44 | .01 | 78 | 54 | 72 | 56 | 5 | 0 | 10 | .095 |
| 4 | 76 | 42 | .01 | 78 | 55 | 72 | 58 | 6 | 0 | 9 | .105 |
| 5 | 79 | 43 | 0 | 79 | 54 | 72 | 52 | 4 | 0 | 11 | .143 |
| 6 | 77 | 48 | .47 | 79 | 54 | 72 | 57 | 2 | 0 | 13 | .140 |
| 7 | 72 | 52 | .01 | 76 | 61 | 70 | 63 | 3 | 0 | 12 | .040 |
| 8 | 72 | 50 | .13 | 74 | 59 | 70 | 61 | 4 | 0 | 11 | .219 |
| 9 | 67 | 42 | .47 | 66 | 55 | 68 | 63 | 10 | 0 | 5 | .046 |
| 10 | 63 | 45 | .11 | 67 | 55 | 63 | 56 | 11 | 0 | 4 | .096 |
| 11 | 63 | 40 | .01 | 68 | 51 | 63 | 54 | 13 | 0 | 2 | .079 |
| 12 | 67 | 41 | T | 70 | 51 | 64 | 53 | 11 | 0 | 4 | .105 |
| 13 | 72 | 51 | 0 | 70 | 54 | 65 | 56 | 3 | 0 | 12 | .124 |
| 14 | 79 | 53 | 0 | 71 | 56 | 67 | 57 | 0 | 1 | 16 | .288 |
| 15 | 79 | 46 | 0 | 74 | 55 | 68 | 56 | 2 | 0 | 13 | .161 |
| 16 | 63 | 49 | 0 | 65 | 56 | 63 | 58 | 9 | 0 | 6 | 0 |
| 17 | 63 | 53 | .08 | 64 | 57 | 61 | 58 | 7 | 0 | 8 | .075 |
| 18 | 58 | 46 | .49 | 59 | 53 | 59 | 54 | 13 | 0 | 2 | .083 |
| 19 | 54 | 47 | .46 | 56 | 52 | 55 | 52 | 14 | 0 | 1 | .022 |
| 20 | 62 | 43 | .17 | 60 | 53 | 58 | 55 | 12 | 0 | 3 | .079 |
| 21 | 59 | 48 | .03 | 63 | 53 | 59 | 52 | 11 | 0 | 4 | .074 |
| 22 | 61 | 38 | .04 | 64 | 51 | 65 | 53 | 15 | 0 | 0 | .055 |
| 23 | 55 | 45 | .14 | 55 | 52 | 54 | 52 | 15 | 0 | 0 | .233 |
| 24 | 56 | 40 | .23 | 60 | 50 | 57 | 53 | 17 | 0 | 0 | .175 |
| 25 | 58 | 38 | .05 | 62 | 48 | 58 | 51 | 17 | 0 | 0 | .044 |
| 26 | 51 | 38 | .58 | 52 | 48 | 52 | 50 | 20 | 0 | 0 | .031 |
| 27 | 57 | 43 | trace | 58 | 48 | 54 | 49 | 15 | 0 | 0 | .041 |
| 28 | 57 | 38 | .01 | 59 | 48 | 55 | 50 | 17 | 0 | 0 | .033 |
| 29 | 54 | 43 | .09 | 56 | 48 | 52 | 50 | 16 | 0 | 0 | .032 |
| 30 | 62 | 45 | .25 | 59 | 51 | 56 | 52 | 11 | 0 | 4 | .169 |
| 31 | 57 | 36 | .22 | 58 | 47 | 55 | 50 | 18 | 0 | 0 | .080 |
| Average/Total | 64.8 | 44.3 | 4.08 | 66.2 | 52.9 | 62.5 | 54.8 | 318 | 1 | 163 | 3.109 |
| Departure | 0.5 | 2.6 | 0.97 |   |   |   |   |   |   |   |   |