Daily Observations at Hyslop Exp. Stn., Corvallis
May 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 | 67 | 40 | 0 | 74 | 51 | 67 | 52 | 11 | 0 | 4 | .073 |
| 2 | 69 | 38 | 0 | 76 | 50 | 70 | 52 | 11 | 0 | 4 | .329 |
| 3 | 72 | 37 | 0 | 79 | 51 | 71 | 54 | 10 | 0 | 5 | .311 |
| 4 | 58 | 45 | .16 | 64 | 52 | 61 | 54 | 13 | 0 | 2 | .080 |
| 5 | 57 | 44 | .06 | 67 | 52 | 62 | 52 | 14 | 0 | 1 | .014 |
| 6 | 58 | 38 | .04 | 70 | 50 | 64 | 52 | 17 | 0 | 0 | .085 |
| 7 | 60 | 38 | .03 | 68 | 50 | 64 | 48 | 16 | 0 | 0 | .070 |
| 8 | 57 | 38 | .07 | 64 | 50 | 60 | 51 | 17 | 0 | 0 | .027 |
| 9 | 58 | 43 | 0 | 66 | 51 | 61 | 52 | 14 | 0 | 1 | .067 |
| 10 | 61 | 46 | .02 | 70 | 53 | 63 | 53 | 11 | 0 | 4 | .082 |
| 11 | 62 | 39 | T | 74 | 51 | 65 | 54 | 14 | 0 | 1 | .142 |
| 12 | 67 | 43 | .33 | 77 | 51 | 69 | 52 | 10 | 0 | 5 | .041 |
| 13 | 67 | 47 | 0 | 79 | 55 | 71 | 56 | 8 | 0 | 7 | .241 |
| 14 | 77 | 44 | 0 | 81 | 55 | 74 | 55 | 4 | 0 | 11 | .270 |
| 15 | 66 | 47 | 0 | 77 | 55 | 69 | 58 | 8 | 0 | 7 | .198 |
| 16 | 58 | 36 | .08 | 69 | 50 | 66 | 54 | 18 | 0 | 0 | .172 |
| 17 | 56 | 36 | .07 | 68 | 50 | 63 | 53 | 19 | 0 | 0 | .176 |
| 18 | 56 | 32 | .34 | 65 | 46 | 60 | 44 | 21 | 0 | 0 | .103 |
| 19 | 60 | 38 | T | 74 | 46 | 68 | 47 | 16 | 0 | 0 | .071 |
| 20 | 72 | 42 | 0 | 78 | 49 | 70 | 52 | 8 | 0 | 7 | .210 |
| 21 | 71 | 42 | 0 | 75 | 54 | 69 | 54 | 8 | 0 | 7 | .162 |
| 22 | 76 | 48 | 0 | 83 | 56 | 75 | 56 | 3 | 0 | 12 | .180 |
| 23 | 79 | 50 | 0 | 86 | 58 | 78 | 60 | 0 | 0 | 15 | .203 |
| 24 | 84 | 52 | 0 | 93 | 61 | 83 | 62 | 0 | 3 | 18 | .265 |
| 25 | 73 | 53 | .04 | 82 | 63 | 75 | 64 | 2 | 0 | 13 | .157 |
| 26 | 65 | 49 | T | 75 | 60 | 70 | 61 | 8 | 0 | 7 | .098 |
| 27 | 70 | 46 | 0 | 83 | 58 | 74 | 59 | 7 | 0 | 8 | .155 |
| 28 | 81 | 53 | 0 | 90 | 58 | 81 | 58 | 0 | 2 | 17 | .208 |
| 29 | 79 | 52 | 0 | 92 | 63 | 83 | 64 | 0 | 1 | 16 | .226 |
| 30 | 80 | 53 | .08 | 91 | 65 | 84 | 64 | 0 | 2 | 17 | .244 |
| 31 | 64 | 47 | .01 | 76 | 61 | 72 | 63 | 9 | 0 | 6 | .153 |
| Average/Total | 67.1 | 43.7 | 1.33 | 76.3 | 54.0 | 69.7 | 55.2 | 297 | 8 | 195 | 4.813 |
| Departure | 1.0 | 0.6 | -0.62 |   |   |   |   |   |   |   |   |