| Highs | Lows | Average | Average Precipitation | January | 41-43 | 20-21 | 31 | 1.79 | February | 43-51 | 22-29 | 36 | 2.17 | March | 43-51 | 29-39 | 46 | 3.89 | April | 63-72 | 40-48 | 56 | 4.18 | May | 72-80 | 49-58 | 65 | 4.38 | June | 81-88 | 58-65 | 73 | 5.09 | July | 88-91 | 65-67 | 78 | 2.92 | August | 85-90 | 62-67 | 77 | 3.51 | September | 76-85 | 52-62 | 69 | 4.62 | October | 64-75 | 41-52 | 58 | 3.58 | November | 50-63 | 30-40 | 46 | 3.75 | December | 42-50 | 21-30 | 35 | 3.16 |
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