Daily Observations at Hyslop Exp. Stn., Corvallis
April 2003
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 | 59 | 42 | .03 | 67 | 50 | 61 | 52 | 14 | 0 | 1 | .118 |
| 2 | 53 | 37 | .05 | 59 | 44 | 57 | 48 | 20 | 0 | 0 | .054 |
| 3 | 50 | 36 | .52 | 56 | 44 | 53 | 46 | 22 | 0 | 0 | .093 |
| 4 | 49 | 39 | .37 | 56 | 44 | 52 | 45 | 21 | 0 | 0 | .077 |
| 5 | 53 | 36 | .22 | 62 | 46 | 55 | 47 | 20 | 0 | 0 | .054 |
| 6 | 47 | 38 | .62 | 52 | 44 | 50 | 46 | 22 | 0 | 0 | .030 |
| 7 | 55 | 40 | .10 | 67 | 44 | 59 | 43 | 17 | 0 | 0 | .073 |
| 8 | 62 | 43 | .05 | 63 | 50 | 58 | 50 | 12 | 0 | 3 | .096 |
| 9 | 69 | 45 | .04 | 69 | 51 | 62 | 49 | 8 | 0 | 7 | .162 |
| 10 | 63 | 45 | .11 | 70 | 51 | 63 | 51 | 11 | 0 | 4 | .107 |
| 11 | 58 | 48 | .08 | 63 | 53 | 59 | 53 | 12 | 0 | 3 | .019 |
| 12 | 64 | 47 | .35 | 72 | 53 | 63 | 52 | 9 | 0 | 6 | .178 |
| 13 | 62 | 42 | .98 | 71 | 52 | 65 | 56 | 13 | 0 | 2 | .203 |
| 14 | 58 | 36 | .07 | 68 | 47 | 62 | 48 | 18 | 0 | 0 | .089 |
| 15 | 57 | 41 | .18 | 60 | 47 | 56 | 49 | 16 | 0 | 0 | .066 |
| 16 | 58 | 43 | .23 | 67 | 48 | 61 | 49 | 14 | 0 | 1 | .101 |
| 17 | 61 | 45 | .07 | 72 | 51 | 64 | 51 | 12 | 0 | 3 | .116 |
| 18 | 56 | 37 | .01 | 64 | 48 | 59 | 51 | 18 | 0 | 0 | .122 |
| 19 | 57 | 34 | T | 67 | 46 | 60 | 49 | 19 | 0 | 0 | .087 |
| 20 | 66 | 41 | 0 | 76 | 46 | 67 | 47 | 11 | 0 | 4 | .152 |
| 21 | 63 | 45 | .74 | 71 | 51 | 63 | 53 | 11 | 0 | 4 | .116 |
| 22 | 55 | 45 | .02 | 63 | 52 | 58 | 52 | 15 | 0 | 0 | .054 |
| 23 | 59 | 42 | .26 | 66 | 51 | 60 | 51 | 14 | 0 | 1 | .094 |
| 24 | 53 | 38 | .96 | 57 | 48 | 54 | 49 | 19 | 0 | 0 | .038 |
| 25 | 53 | 34 | .07 | 62 | 45 | 57 | 47 | 21 | 0 | 0 | .064 |
| 26 | 55 | 38 | .18 | 62 | 45 | 56 | 46 | 18 | 0 | 0 | .055 |
| 27 | 56 | 36 | .07 | 63 | 46 | 58 | 47 | 19 | 0 | 0 | .093 |
| 28 | 64 | 42 | 0 | 70 | 46 | 63 | 47 | 12 | 0 | 3 | .184 |
| 29 | 57 | 45 | .10 | 59 | 52 | 57 | 52 | 14 | 0 | 1 | .018 |
| 30 | 66 | 43 | T | 74 | 52 | 66 | 52 | 10 | 0 | 5 | .111 |
| Average/Total | 57.9 | 40.8 | 6.48 | 64.9 | 48.2 | 59.3 | 49.3 | 462 | 0 | 48 | 2.824 |
| Departure | -1.6 | 1.6 | 3.92 |   |   |   |   |   |   |   |   |