Daily Observations at Hyslop Exp. Stn., Corvallis
May 2001
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 | 38 | .22 | 65 | 53 | 59 | 51 | 16 | 0 | 0 | .115 |
| 2 | 57 | 34 | .02 | 66 | 47 | 60 | 49 | 19 | 0 | 0 | .137 |
| 3 | 58 | 38 | 0 | 68 | 48 | 64 | 48 | 17 | 0 | 0 | .177 |
| 4 | 70 | 40 | 0 | 75 | 48 | 67 | 49 | 10 | 0 | 5 | .155 |
| 5 | 73 | 37 | 0 | 71 | 49 | 64 | 52 | 10 | 0 | 5 | .187 |
| 6 | 60 | 38 | 0 | 69 | 48 | 64 | 51 | 16 | 0 | 0 | .151 |
| 7 | 69 | 37 | 0 | 77 | 49 | 69 | 50 | 12 | 0 | 3 | .125 |
| 8 | 79 | 41 | 0 | 83 | 50 | 74 | 53 | 5 | 0 | 10 | .241 |
| 9 | 73 | 37 | 0 | 82 | 53 | 74 | 56 | 10 | 0 | 5 | .240 |
| 10 | 69 | 34 | 0 | 82 | 51 | 74 | 55 | 13 | 0 | 2 | .190 |
| 11 | 69 | 43 | 0 | 83 | 51 | 76 | 53 | 9 | 0 | 6 | .217 |
| 12 | 81 | 45 | 0 | 94 | 55 | 80 | 57 | 2 | 0 | 13 | .222 |
| 13 | 71 | 48 | 0 | 88 | 58 | 79 | 61 | 5 | 0 | 10 | .248 |
| 14 | 68 | 48 | .10 | 87 | 59 | 79 | 61 | 7 | 0 | 8 | .183 |
| 15 | 55 | 49 | .54 | 62 | 58 | 61 | 59 | 13 | 0 | 2 | .015 |
| 16 | 60 | 46 | .20 | 65 | 54 | 61 | 56 | 12 | 0 | 3 | .043 |
| 17 | 63 | 40 | .01 | 74 | 53 | 68 | 55 | 13 | 0 | 2 | .141 |
| 18 | 62 | 39 | T | 72 | 51 | 66 | 53 | 14 | 0 | 1 | .15 |
| 19 | 65 | 40 | 0 | 75 | 51 | 69 | 53 | 12 | 0 | 3 | .106 |
| 20 | 72 | 43 | 0 | 82 | 53 | 72 | 52 | 7 | 0 | 8 | .211 |
| 21 | 71 | 46 | 0 | 80 | 53 | 73 | 56 | 6 | 0 | 9 | .274 |
| 22 | 82 | 52 | 0 | 86 | 55 | 78 | 57 | 0 | 2 | 17 | .289 |
| 23 | 93 | 49 | 0 | 97 | 60 | 86 | 63 | 0 | 6 | 21 | .214 |
| 24 | 86 | 44 | 0 | 98 | 62 | 86 | 64 | 0 | 0 | 15 | .260 |
| 25 | 81 | 47 | 0 | 95 | 64 | 85 | 64 | 1 | 0 | 14 | .266 |
| 26 | 81 | 45 | 0 | 95 | 63 | 85 | 65 | 2 | 0 | 13 | .251 |
| 27 | 84 | 42 | 0 | 100 | 62 | 88 | 64 | 2 | 0 | 13 | .278 |
| 28 | 70 | 50 | 0 | 87 | 63 | 79 | 65 | 5 | 0 | 10 | .226 |
| 29 | 61 | 32 | .02 | 73 | 52 | 70 | 57 | 18 | 0 | 0 | .133 |
| 30 | 67 | 41 | 0 | 90 | 52 | 80 | 55 | 11 | 0 | 4 | .213 |
| 31 | 79 | 53 | 0 | 97 | 58 | 86 | 62 | 0 | 1 | 16 | .257 |
| Average/Total | 70.6 | 42.5 | 1.11 | 81.2 | 54.3 | 73.4 | 56.3 | 267 | 9 | 218 | 5.915 |
| Departure | 4.5 | -0.6 | -0.84 |   |   |   |   |   |   |   |   |