Daily Observations at Hyslop Exp. Stn., Corvallis
May 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 | 64 | 39 | 0 | 0 | 70 | 47 | 63 | 47 | 13 | 0 | 2 | 0.06 |
| 2 | 70 | 51 | 0.57 | 0 | 73 | 50 | 66 | 50 | 4 | 0 | 11 | 0.30 |
| 3 | 64 | 45 | 0.24 | 0 | 67 | 55 | 65 | 55 | 10 | 0 | 5 | 0.11 |
| 4 | 62 | 43 | 0.05 | 0 | 71 | 53 | 64 | 51 | 12 | 0 | 3 | 0.12 |
| 5 | 57 | 48 | 1.02 | 0 | 59 | 52 | 57 | 54 | 12 | 0 | 3 | 0.15 |
| 6 | 57 | 50 | 0.33 | 0 | 60 | 52 | 57 | 54 | 11 | 0 | 4 | 0.16 |
| 7 | 61 | 44 | 0.26 | 0 | 67 | 50 | 61 | 52 | 12 | 0 | 3 | 0.07 |
| 8 | 60 | 37 | 0.01 | 0 | 69 | 47 | 63 | 51 | 16 | 0 | 0 | 0.06 |
| 9 | 61 | 38 | T | 0 | 70 | 46 | 63 | 50 | 15 | 0 | 0 | 0.20 |
| 10 | 67 | 38 | 0 | 0 | 74 | 46 | 67 | 48 | 12 | 0 | 3 | 0.19 |
| 11 | 69 | 45 | 0.01 | 0 | 74 | 49 | 66 | 52 | 8 | 0 | 7 | 0.12 |
| 12 | 64 | 42 | 0.08 | 0 | 72 | 52 | 64 | 55 | 12 | 0 | 3 | 0.26 |
| 13 | 57 | 35 | 0.06 | 0 | 69 | 48 | 63 | 49 | 19 | 0 | 0 | 0.25 |
| 14 | 55 | 43 | 0.88 | 0 | 56 | 49 | 54 | 49 | 16 | 0 | 0 | 0.03 |
| 15 | 66 | 40 | T | 0 | 77 | 51 | 69 | 54 | 12 | 0 | 3 | 0.09 |
| 16 | 69 | 39 | 0 | 0 | 77 | 51 | 70 | 54 | 11 | 0 | 4 | 0.31 |
| 17 | 80 | 45 | 0 | 0 | 80 | 52 | 71 | 54 | 2 | 0 | 13 | 0.20 |
| 18 | 81 | 45 | 0 | 0 | 80 | 55 | 74 | 56 | 2 | 0 | 13 | 0.18 |
| 19 | 79 | 42 | 0.13 | 0 | 83 | 53 | 76 | 58 | 4 | 0 | 11 | 0.01 |
| 20 | 60 | 35 | 0.01 | 0 | 71 | 48 | 67 | 53 | 17 | 0 | 0 | 0.12 |
| 21 | 63 | 41 | 0 | 0 | 74 | 49 | 69 | 52 | 13 | 0 | 2 | 0.25 |
| 22 | 71 | 39 | 0 | 0 | 82 | 53 | 74 | 55 | 10 | 0 | 5 | 0.24 |
| 23 | 72 | 40 | 0 | 0 | 83 | 53 | 78 | 55 | 9 | 0 | 6 | 0.24 |
| 24 | 73 | 37 | 0 | 0 | 86 | 54 | 78 | 57 | 10 | 0 | 5 | 0.23 |
| 25 | 72 | 37 | 0 | 0 | 94 | 54 | 80 | 57 | 10 | 0 | 5 | 0.22 |
| 26 | 74 | 41 | 0 | 0 | 89 | 54 | 81 | 58 | 7 | 0 | 8 | 0.13 |
| 27 | 76 | 46 | 0 | 0 | 89 | 59 | 81 | 61 | 4 | 0 | 11 | 0.22 |
| 28 | 77 | 48 | 0 | 0 | 90 | 60 | 82 | 63 | 2 | 0 | 13 | 0.28 |
| 29 | 84 | 49 | 0 | 0 | 93 | 62 | 85 | 63 | 0 | 2 | 17 | 0.29 |
| 30 | 87 | 52 | 0 | 0 | 98 | 65 | 88 | 67 | 0 | 5 | 20 | 0.31 |
| 31 | 86 | 45 | 0 | 0 | 98 | 65 | 88 | 69 | 0 | 1 | 16 | 0.39 |
| Average/Total | 69.0 | 42.5 | 3.65 | 0.00 | 77.3 | 52.7 | 70.5 | 54.9 | 285 | 8 | 196 | 5.790 |
| Departure | 2.9 | -0.6 | 1.70 |   |   |   |   |   |   |   |   |   |