Daily Observations at Hyslop Exp. Stn., Corvallis
April 2009
Bold = new daily record set (old record, year)
| Day | Max Temp (F) | Min Temp (F) | Precip (in) | Snow (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 | 52 | 39 | 0.07 | 0 | 55 | 44 | 51 | 46 | 19 | 0 | 0 | 0.06 |
| 2 | 51 | 40 | 0.18 | 0 | 52 | 44 | 49 | 45 | 19 | 0 | 0 | 0.14 |
| 3 | 54 | 37 | 0.02 | 0 | 58 | 43 | 52 | 46 | 19 | 0 | 0 | 0.1 |
| 4 | 51 | 28 | 0.05 | 0 | 60 | 38 | 54 | 43 | 25 | 0 | 0 | 0.60 |
| 5 | 59 | 32 | 0 | 0 | 64 | 37 | 58 | 41 | 19 | 0 | 0 | 0.18 |
| 6 | 70 | 36 | 0 | 0 | 71 | 41 | 62 | 43 | 12 | 0 | 3 | 0.13 |
| 7 | 72 | 38 | 0 | 0 | 69 | 44 | 61 | 47 | 10 | 0 | 5 | 0.14 |
| 8 | 72 | 43 | 0 | 0 | 66 | 46 | 59 | 48 | 7 | 0 | 8 | 0.10 |
| 9 | 53 | 45 | 0.02 | 0 | 56 | 49 | 54 | 51 | 16 | 0 | 0 | 0.18 |
| 10 | 58 | 38 | 0.07 | 0 | 63 | 47 | 57 | 49 | 17 | 0 | 0 | 0.06 |
| 11 | 58 | 40 | T | 0 | 65 | 46 | 60 | 48 | 16 | 0 | 0 | 0.21 |
| 12 | 58 | 43 | 0.02 | 0 | 62 | 46 | 58 | 46 | 14 | 0 | 1 | 0.13 |
| 13 | 57 | 39 | 0.24 | 0 | 57 | 47 | 53 | 49 | 17 | 0 | 0 | 0.02 |
| 14 | 50 | 33 | 0.10 | 0 | 61 | 43 | 56 | 46 | 23 | 0 | 0 | 0.12 |
| 15 | 52 | 30 | 0.02 | 0 | 64 | 41 | 52 | 44 | 24 | 0 | 0 | 0.01 |
| 16 | 55 | 30 | 0.01 | 0 | 64 | 42 | 57 | 44 | 22 | 0 | 0 | 0.17 |
| 17 | 64 | 37 | 0.16 | 0 | 69 | 41 | 61 | 44 | 14 | 0 | 1 | 0.12 |
| 18 | 64 | 38 | 0 | 0 | 69 | 46 | 62 | 49 | 14 | 0 | 1 | 0.13 |
| 19 | 64 | 38 | 0 | 0 | 70 | 45 | 62 | 48 | 14 | 0 | 1 | 0.14 |
| 20 | 76 | 43 | 0 | 0 | 74 | 47 | 67 | 48 | 5 | 0 | 10 | 0.1 |
| 21 | 78 | 46 | 0 | 0 | 78 | 50 | 71 | 52 | 3 | 0 | 12 | 0.22 |
| 22 | 80 | 42 | 0 | 0 | 81 | 52 | 74 | 55 | 4 | 0 | 11 | 0.17 |
| 23 | 64 | 31 | 0 | 0 | 77 | 47 | 69 | 53 | 17 | 0 | 0 | 0.17 |
| 24 | 54 | 32 | 0.03 | 0 | 67 | 43 | 61 | 48 | 22 | 0 | 0 | 0.21 |
| 25 | 60 | 32 | T | 0 | 74 | 43 | 67 | 47 | 19 | 0 | 0 | 0.19 |
| 26 | 57 | 34 | T | 0 | 66 | 46 | 60 | 48 | 19 | 0 | 0 | 0.1 |
| 27 | 57 | 39 | 0 | 0 | 70 | 48 | 62 | 49 | 17 | 0 | 0 | 0.1 |
| 28 | 56 | 44 | 0.01 | 0 | 65 | 51 | 59 | 53 | 15 | 0 | 0 | 0.02 |
| 29 | 51 | 37 | .29 | 0 | 59 | 47 | 56 | 50 | 21 | 0 | 0 | 0.06 |
| 30 | 59 | 32 | T | 0 | 69 | 45 | 59 | 48 | 19 | 0 | 0 | 0.09 |
| Average/Total | 60.2 | 37.2 | 1.29 | 0.00 | 65.8 | 45.0 | 59.4 | 47.6 | 482 | 0 | 53 | 4.170 |
| Departure | 0.7 | -2.0 | -1.27 |   |   |   |   |   |   |   |   |   |