Daily Observations at Hyslop Exp. Stn., Corvallis
April 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 | 56 | 41 | .01 | 58 | 50 | 56 | 51 | 16 | 0 | 0 | .023 |
| 2 | 51 | 37 | .14 | 58 | 46 | 54 | 48 | 21 | 0 | 0 | .039 |
| 3 | 50 | 30 | .18 | 61 | 43 | 55 | 46 | 25 | 0 | 0 | .073 |
| 4 | 54 | 28 | .02 | 63 | 43 | 57 | 43 | 24 | 0 | 0 | .092 |
| 5 | 57 | 29 | T | 66 | 42 | 58 | 43 | 22 | 0 | 0 | .107 |
| 6 | 58 | 34 | .07 | 58 | 42 | 54 | 43 | 19 | 0 | 0 | .086 |
| 7 | 49 | 28 | .09 | 56 | 42 | 53 | 45 | 26 | 0 | 0 | .035 |
| 8 | 53 | 32 | .21 | 60 | 42 | 54 | 43 | 22 | 0 | 0 | .115 |
| 9 | 53 | 31 | .02 | 59 | 43 | 53 | 45 | 23 | 0 | 0 | .002 |
| 10 | 55 | 36 | .16 | 64 | 42 | 56 | 43 | 19 | 0 | 0 | .006 |
| 11 | 53 | 39 | .44 | 55 | 46 | 52 | 47 | 19 | 0 | 0 | .052 |
| 12 | 60 | 35 | 0 | 68 | 45 | 60 | 45 | 17 | 0 | 0 | .155 |
| 13 | 53 | 31 | .11 | 58 | 43 | 53 | 46 | 23 | 0 | 0 | .025 |
| 14 | 51 | 30 | .14 | 61 | 41 | 54 | 44 | 24 | 0 | 0 | .091 |
| 15 | 54 | 29 | .01 | 62 | 40 | 56 | 42 | 23 | 0 | 0 | .086 |
| 16 | 61 | 36 | 0 | 65 | 41 | 58 | 42 | 16 | 0 | 0 | .076 |
| 17 | 64 | 41 | .10 | 66 | 46 | 60 | 47 | 12 | 0 | 3 | .074 |
| 18 | 61 | 45 | .05 | 65 | 48 | 59 | 49 | 12 | 0 | 3 | .096 |
| 19 | 60 | 37 | .01 | 66 | 48 | 60 | 51 | 16 | 0 | 0 | .088 |
| 20 | 58 | 39 | 0 | 66 | 48 | 61 | 49 | 16 | 0 | 0 | .135 |
| 21 | 58 | 33 | 0 | 70 | 48 | 62 | 50 | 19 | 0 | 0 | .139 |
| 22 | 66 | 35 | 0 | 71 | 48 | 64 | 48 | 14 | 0 | 1 | .169 |
| 23 | 55 | 44 | .12 | 59 | 49 | 56 | 49 | 15 | 0 | 0 | .011 |
| 24 | 61 | 40 | .11 | 62 | 50 | 58 | 50 | 14 | 0 | 1 | .049 |
| 25 | 74 | 43 | 0 | 77 | 50 | 68 | 51 | 6 | 0 | 9 | .173 |
| 26 | 79 | 46 | 0 | 80 | 53 | 71 | 54 | 2 | 0 | 13 | .186 |
| 27 | 77 | 41 | 0 | 81 | 54 | 73 | 57 | 6 | 0 | 9 | .051 |
| 28 | 61 | 45 | .15 | 67 | 53 | 62 | 55 | 12 | 0 | 3 | .102 |
| 29 | 58 | 43 | .06 | 62 | 51 | 61 | 54 | 14 | 0 | 1 | .122 |
| 30 | 57 | 46 | .13 | 57 | 51 | 54 | 51 | 13 | 0 | 2 | .047 |
| Average/Total | 58.6 | 36.8 | 2.33 | 64.0 | 46.3 | 58.4 | 47.7 | 510 | 0 | 45 | 2.505 |
| Departure | -0.9 | -2.4 | -0.23 |   |   |   |   |   |   |   |   |