Daily Observations at Hyslop Exp. Stn., Corvallis
April 2000
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 | 39 | 0 | 67 | 46 | 60 | 45 | 11 | 0 | 4 | .155 |
| 2 | 74 | 41 | 0 | 74 | 48 | 66 | 48 | 7 | 0 | 8 | .169 |
| 3 | 69 | 40 | 0 | 70 | 49 | 64 | 49 | 10 | 0 | 5 | .110 |
| 4 | 77 | 43 | 0 | 76 | 48 | 68 | 51 | 5 | 0 | 10 | .198 |
| 5 | 57 | 32 | 0 | 60 | 43 | 56 | 46 | 20 | 0 | 0 | .098 |
| 6 | 56 | 37 | 0 | 63 | 43 | 56 | 46 | 18 | 0 | 0 | .077 |
| 7 | 58 | 37 | 0 | 63 | 46 | 57 | 48 | 17 | 0 | 0 | .102 |
| 8 | 67 | 43 | 0 | 67 | 44 | 61 | 46 | 10 | 0 | 5 | .258 |
| 9 | 63 | 41 | 0 | 64 | 47 | 59 | 48 | 13 | 0 | 2 | .094 |
| 10 | 57 | 33 | 0 | 59 | 45 | 66 | 48 | 20 | 0 | 0 | .058 |
| 11 | 68 | 36 | 0 | 72 | 45 | 65 | 47 | 13 | 0 | 2 | .089 |
| 12 | 73 | 42 | 0 | 73 | 45 | 65 | 49 | 7 | 0 | 8 | .112 |
| 13 | 74 | 52 | .17 | 74 | 54 | 67 | 55 | 2 | 0 | 13 | .123 |
| 14 | 60 | 43 | .29 | 65 | 53 | 61 | 54 | 13 | 0 | 2 | .000 |
| 15 | 61 | 42 | .28 | 65 | 53 | 60 | 51 | 13 | 0 | 2 | .087 |
| 16 | 58 | 44 | .19 | 67 | 52 | 61 | 51 | 14 | 0 | 1 | .076 |
| 17 | 58 | 42 | .01 | 64 | 53 | 61 | 53 | 15 | 0 | 0 | .061 |
| 18 | 68 | 50 | 0 | 74 | 53 | 66 | 53 | 6 | 0 | 9 | .175 |
| 19 | 63 | 40 | 0 | 67 | 52 | 63 | 54 | 13 | 0 | 2 | .037 |
| 20 | 61 | 42 | 0 | 73 | 51 | 62 | 53 | 13 | 0 | 2 | .172 |
| 21 | 70 | 39 | 0 | 76 | 51 | 69 | 52 | 10 | 0 | 5 | .192 |
| 22 | 68 | 40 | .08 | 72 | 50 | 65 | 52 | 11 | 0 | 4 | .137 |
| 23 | 58 | 34 | .03 | 63 | 45 | 61 | 50 | 19 | 0 | 0 | .111 |
| 24 | 54 | 28 | .18 | 61 | 43 | 57 | 46 | 24 | 0 | 0 | .067 |
| 25 | 52 | 34 | .11 | 60 | 43 | 55 | 44 | 22 | 0 | 0 | .080 |
| 26 | 60 | 37 | .02 | 66 | 48 | 58 | 50 | 16 | 0 | 0 | .108 |
| 27 | 71 | 46 | 0 | 75 | 48 | 67 | 49 | 6 | 0 | 9 | .121 |
| 28 | 61 | 42 | .18 | 63 | 49 | 57 | 51 | 13 | 0 | 2 | .062 |
| 29 | 56 | 32 | .09 | 67 | 47 | 60 | 48 | 21 | 0 | 0 | .090 |
| 30 | 63 | 41 | 0 | 73 | 46 | 66 | 47 | 13 | 0 | 2 | .132 |
| Average/Total | 63.4 | 39.7 | 1.63 | 67.8 | 48.0 | 62.0 | 49.5 | 395 | 0 | 97 | 3.351 |
| Departure | 3.9 | 0.5 | -0.93 |   |   |   |   |   |   |   |   |