| Station | Date | Daily Max Temp (°F) | Time of Max Temp | Daily Min Temp (°F) | Time of Min Temp | Dew Pt (°F) | RH (%) | Daily Max RH (%) | Daily Min RH (%) | Wind Spd (mph) | Daily Max Wind (mph) | Time of Max Wind | Max Wind Dir (°) | Daily Rain (In) | Season Precip (In) | Daily ETo (in) | Daily Solar Rad (Cal/cm2) | Powdery Mildew Stress (pts) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rockpile Lower (Cooley) | 12/18/25 | 56.4 5.1 | 1328 | 44.0 4.0 | 0749 | 47.7 1.8 | 94 | 100 0 | 78 19 | 1.1 | 5.5 11.3 | 2244 | E | 95 | 0.04 | 10.16 | - | - | 0 0 |
| Rockpile Upper (Cooley) | 12/18/25 | 54.7 2.9 | 1251 | 45.2 1.6 | 0727 | 47.6 1.9 | 94 | 100 0 | 64 2 | 2.5 | 9.4 15.6 | 2055 | SW | 230 | 0.03 | 10.31 | 0.029 0.019 | 150 106 | 0 0 |
| Cloverdale-East (Ranch 83) | 12/18/25 | 58.0 8.6 | 1416 | 39.3 3.7 | 0327 | -27.7 26.1 | - | - | - | 1.3 | 8.6 1.5 | 1453 | SSW | 196 | 0.02 | 8.04 | 0.030 0.023 | 126 79 | 0 0 |
| Cloverdale-SE (Ranch 38) | 12/18/25 | 57.3 9.5 | 1434 | 44.3 4.1 | 0550 | 48.5 2.9 | 98 | 100 0 | 82 24 | 2.5 | 11.8 0.4 | 1440 | NNE | 24 | 0.01 | 8.64 | 0.020 0.024 | 105 80 | 0 0 |
| Geyserville-North (Hoffman) | 12/18/25 | 54.7 12.4 | 1442 | 38.7 2.9 | 0312 | 47.0 0.2 | 94 | 98 0 | 85 24 | 1.3 | 6.6 2.5 | 1512 | SE | 130 | 0.00 | 0.00 | 0.019 0.024 | 74 105 | 0 0 |
| Geyserville (Ranch 3) | 12/18/25 | 54.2 11.6 | 1433 | 40.4 2.9 | 0315 | 48.0 3.1 | 97 | 100 0 | 84 30 | 1.5 | 6.0 4.3 | 1343 | ESE | 111 | 0.00 | 7.90 | 0.018 0.025 | 84 93 | 0 0 |
| Geyserville-East (Ranch 40) | 12/18/25 | 51.6 15.7 | 2349 | 44.6 4.1 | 0709 | 48.8 3.2 | 99 | 100 0 | 93 36 | 2.6 | 9.4 3.2 | 1327 | SSW | 194 | 0.01 | 8.25 | 0.015 0.030 | 76 120 | 0 0 |
| Geyserville-South (Nervo Station) | 12/18/25 | 53.9 12.3 | 1420 | 43.7 3.4 | 0140 | - | - | - | - | 0.4 | 5.4 5.4 | 1446 | ESE | 115 | 0.01 | 6.38 | - | - | 0 0 |
| Jimtown-North (Piccolo Ranch 15) | 12/18/25 | 54.5 12.2 | 1531 | 42.0 0.7 | 0106 | 48.8 1.6 | 97 | 100 0 | 83 31 | 0.6 | 5.9 2.0 | 1043 | SSW | 213 | 0.02 | 8.09 | 0.016 0.010 | 69 48 | 0 0 |
| Jimtown-NE (Red Fan) | 8/26/25 | 88.9 0.8 | 1609 | 56.4 0.1 | 0146 | 53.1 1.9 | 64 | 94 2 | 20 8 | 3.5 | 13.4 0.5 | 1919 | S | 169 | 0.00 | 0.00 | 0.187 0.011 | 528 30 | 0 0 |
| HWY 128/Chalk Hill Rd (Landslide) | 12/18/25 | 54.5 14.3 | 1535 | 44.1 2.4 | 0001 | 49.5 2.0 | 96 | 100 0 | 86 34 | 0.8 | 4.9 5.5 | 1052 | SSW | 207 | 0.03 | 8.49 | 0.015 0.019 | 63 73 | 0 0 |
| N Chalk Hill Rd (Ranch 63) | 12/18/25 | 53.7 11.4 | 1558 | 43.1 1.2 | 0024 | 48.2 2.2 | 97 | 100 0 | 85 29 | 1.2 | 5.9 4.6 | 0901 | N | 354 | 0.02 | 8.55 | 0.015 0.014 | 66 55 | - |
| Knights Valley (Bavarian Lion) | 12/18/25 | 54.5 11.4 | 1537 | 46.3 2.7 | 0001 | 49.0 1.4 | 95 | 98 0 | 83 30 | 0.8 | 4.8 3.7 | 0035 | SSE | 168 | 0.03 | 8.86 | 0.016 0.021 | 72 81 | - |
| Upper Dry Creek Valley | 12/18/25 | 54.5 11.8 | 1436 | 39.3 2.7 | 0404 | 46.8 3.1 | 94 | 98 0 | 84 31 | 0.9 | 6.7 5.7 | 1457 | SSE | 166 | 0.00 | 8.41 | 0.021 0.028 | 96 108 | - |
| Lower Dry Creek Valley | 12/18/25 | 54.4 13.5 | 1510 | 39.5 1.5 | 0207 | 47.9 3.0 | 97 | 100 0 | 83 34 | 1.3 | 5.1 4.0 | 1306 | SSE | 165 | 0.00 | 8.65 | 0.017 0.020 | 77 74 | 0 0 |
| Max | 58.0 | - | 46.3 | - | 49.5 | 99 | 100 | 93 | 2.6 | 11.8 | - | - | 0.04 | 10.31 | 0.030 | 150 | - | |
| Avg | - | - | - | - | 42.3 | 96 | - | - | 1.4 | - | - | - | - | - | - | - | - | |
| Min | 51.6 | - | 38.7 | - | -27.7 | 94 | 98 | 64 | 0.4 | 4.8 | - | - | 0.00 | 0.00 | 0.015 | 63 | - |
| Station | Date | Daily Max Temp (°F) | Time of Max Temp | Daily Min Temp (°F) | Time of Min Temp | Dew Pt (°F) | RH (%) | Daily Max RH (%) | Daily Min RH (%) | Wind Spd (mph) | Daily Max Wind (mph) | Time of Max Wind | Daily Rain (In) | Season Precip (In) | Daily ETo (in) | Daily Solar Rad (Cal/cm2) | Powdery Mildew Stress (pts) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Healdsburg-South (Sodini) | 12/18/25 | 56.6 12.7 | 1502 | 42.8 0.2 | 0049 | - | - | 100 0 | 80 29 | 0.2 | 5.4 3.9 | 1300 | 0.01 | 2.50 | - | - | 0 |
| Windsor-NW (Ranch 8) | 12/18/25 | 56.3 12.4 | 1500 | 41.9 2.4 | 0149 | 45.7 3.4 | 86 | 90 2 | 81 24 | 0.5 | 4.1 5.5 | 1343 | 0.01 | 8.98 | 0.017 0.017 | 78 61 | - |
| Windsor-East (Ranch 16) | 12/18/25 | 56.8 11.8 | 1538 | 40.2 2.8 | 0127 | 48.8 3.3 | 96 | 100 0 | 79 28 | 0.5 | 5.1 4.8 | 1225 | 0.01 | 6.65 | 0.015 0.023 | 65 92 | 0 |
| Mark West-North (Ranch 14) | 12/18/25 | 56.6 12.0 | 1546 | 43.3 0.9 | 0052 | 48.4 3.0 | 94 | 99 0 | 76 25 | 0.2 | 3.1 2.2 | 1350 | 0.01 | 7.64 | 0.001 0.002 | 0 0 | 0 |
| Windsor-SE (Silk Rd) | 12/18/25 | 57.3 9.7 | 1547 | 40.8 0.1 | 0005 | 48.3 2.3 | 95 | 100 0 | 76 24 | 0.6 | 4.7 2.5 | 1526 | 0.01 | 2.07 | 0.020 0.012 | 100 37 | 0 |
| Fulton-NW (Ranch 5) | 12/18/25 | 56.8 9.7 | 1555 | 40.8 1.5 | 0151 | 10.2 1.1 | 47 | 100 0 | 3 0 | 0.6 | 4.0 3.2 | 1427 | 0.01 | 7.74 | 0.025 0.022 | 90 57 | 0 |
| Windsor-South (Laughlin Rd) | 12/18/25 | 59.2 9.4 | 1549 | 41.3 0.9 | 0206 | -7.2 4.0 | 41 | 100 0 | 0 0 | - | - | - | 0.01 | 7.29 | - | - | - |
| Fulton-SE (Barnes Rd) | 12/18/25 | 56.5 9.6 | 1542 | 41.0 1.9 | 0133 | 48.6 3.9 | 94 | 98 0 | 79 14 | 0.7 | 5.2 2.6 | 1411 | 0.00 | 7.24 | - | - | - |
| Fulton-SW (Ranch 21) | 12/18/25 | 56.3 10.0 | 1557 | 39.7 2.0 | 0155 | -17.9 3.2 | 36 | 100 0 | 0 0 | 0.8 | 4.9 2.7 | 0904 | 0.01 | 7.64 | 0.034 0.015 | 104 29 | - |
| Santa Rosa-NW (Goldfields) | 12/18/25 | 60.8 9.5 | 1555 | 39.7 2.0 | 0206 | 48.6 3.4 | 95 | 100 0 | 68 17 | 0.9 | 4.9 2.6 | 0859 | 0.00 | 7.94 | 0.017 0.009 | 78 22 | - |
| Goldfields Remote | 12/18/25 | 57.7 10.4 | 1555 | 39.7 1.1 | 0150 | - | - | - | - | - | - | - | - | - | - | - | 0 |
| NW Santa Rosa (Piner Road) | 12/18/25 | 56.2 10.0 | 1601 | 39.6 1.8 | 0157 | 49.2 3.8 | 99 | 100 0 | 88 15 | 0.4 | 4.0 1.0 | 1439 | 0.01 | 6.21 | - | - | - |
| River Rd South (Denner Ranch) | 12/18/25 | 58.1 10.3 | 1534 | 41.2 1.5 | 0147 | 49.0 3.1 | 98 | 100 0 | 75 19 | 1.2 | 6.4 2.4 | 0918 | - | - | - | - | - |
| West Santa Rosa (LOV Vineyard) | 12/18/25 | 57.9 11.4 | 1536 | 41.7 1.1 | 0128 | 48.3 3.9 | 94 | 100 0 | 75 17 | 0.6 | 4.7 1.4 | 1441 | 0.04 | 8.17 | 0.002 0.002 | 0 0 | 0 |
| Guerneville Rd (Prokopakis) | 12/18/25 | 58.2 12.6 | 1516 | 42.8 0.5 | 0238 | 48.7 3.6 | 94 | 100 0 | 74 19 | - | - | - | 0.01 | 7.33 | - | - | - |
| Guerneville Rd West (Balletto) | 12/18/25 | 56.7 10.6 | 1535 | 41.9 0.0 | 0005 | 49.0 3.4 | 96 | 100 0 | 81 19 | 0.8 | 5.2 3.0 | 0553 | 0.01 | 6.03 | - | - | - |
| Sanchietti Ranch | 12/18/25 | 57.4 9.5 | 1520 | 41.9 0.4 | 0105 | 49.8 4.1 | - | 100 0 | 84 16 | 1.2 | 5.4 5.1 | 1418 | 0.00 | 7.15 | - | - | - |
| Occidental Rd (Sebastopol) | 12/18/25 | 57.0 10.9 | 1403 | 40.7 0.5 | 0030 | 49.7 4.0 | 100 | 100 0 | 79 27 | 1.0 | 6.1 2.9 | 1427 | 0.01 | 5.93 | - | - | - |
| Lower Westside Rd (Ranch 12) | 12/18/25 | 56.3 11.2 | 1449 | 42.7 0.9 | 0031 | 48.7 3.5 | 96 | 100 0 | 78 6 | 0.4 | 5.0 0.0 | 1336 | 0.01 | 8.67 | - | - | 0 |
| Guerneville (Laughlin Rd) | 12/18/25 | 56.7 12.9 | 1441 | 45.9 2.0 | 0350 | 49.6 3.2 | 95 | 99 0 | 79 23 | 0.4 | 4.1 2.7 | 1022 | 0.02 | 9.56 | - | - | - |
| Korbel (Winery) | 12/18/25 | 56.0 10.4 | 1517 | 46.7 1.9 | 0352 | 49.8 3.1 | 96 | 100 0 | 82 22 | 0.8 | 5.4 2.1 | 1502 | 0.00 | 9.69 | - | - | - |
| Forestville (Shone Farms) | 12/18/25 | 56.1 11.0 | 1444 | 43.8 2.0 | 0311 | 48.7 3.5 | 95 | 99 0 | 82 17 | 0.9 | 4.9 2.1 | 0501 | 0.02 | 9.44 | 0.019 0.017 | 83 64 | 0 |
| Forestville-NE (Ranch 30) | 12/18/25 | 56.5 14.1 | 1539 | 44.4 0.7 | 0337 | 49.0 3.6 | 98 | 100 0 | 84 18 | 0.9 | 5.6 3.4 | 1327 | 0.02 | 8.86 | 0.019 0.018 | 90 75 | - |
| Green Valley Vineyard | 12/18/25 | 56.3 11.1 | 1514 | 42.0 1.4 | 0319 | 48.3 4.0 | 95 | 99 0 | 79 23 | 0.7 | 4.4 5.9 | 1441 | 0.01 | 10.18 | 0.002 0.004 | 0 0 | - |
| Green Valley (Sanchietti) | 12/18/25 | 59.2 9.5 | 1511 | 41.9 0.2 | 0045 | - | - | - | - | - | - | - | - | - | - | - | - |
| Keefer Ranch (Green Valley) | 12/18/25 | 57.1 9.5 | 1537 | 40.7 0.6 | 0020 | 49.0 2.8 | 96 | 100 0 | 83 19 | - | - | - | 0.01 | 8.80 | - | - | - |
| Graton-South (Mill Station Rd) | 12/18/25 | 57.7 10.1 | 1522 | 40.0 2.5 | 0248 | 48.3 4.7 | 96 | 100 0 | 77 19 | 0.0 | 3.0 2.9 | 1420 | 0.01 | 8.61 | - | - | 0 |
| Occidental (Horseshoe Bend) | 12/18/25 | 56.6 8.0 | 1350 | 47.1 1.4 | 0255 | 49.7 4.2 | - | 100 0 | 80 18 | - | - | - | 0.01 | 8.83 | - | - | - |
| Sexton Valley (Jacqueline's Blk) | 12/18/25 | 57.3 9.9 | 1441 | 40.6 2.2 | 0109 | 48.8 4.8 | 95 | 100 0 | 79 11 | 0.5 | 5.0 4.2 | 1331 | 0.01 | 6.99 | - | - | - |
| Sebastopol Hills (Burnside Rd) | 12/18/25 | 56.5 7.4 | 1513 | 44.0 2.5 | 0424 | 49.4 4.9 | 98 | 100 0 | 83 14 | 0.6 | 5.6 6.7 | 1306 | 0.00 | 7.72 | - | - | - |
| Seaview/Fort Ross (Hirsch) | 12/18/25 | 57.2 2.2 | 0941 | 45.3 3.9 | 0514 | 47.8 3.2 | 89 | 97 0 | 55 14 | 1.6 | 8.6 7.4 | 2319 | 0.01 | 13.85 | 0.030 0.015 | 149 61 | - |
| Max | 60.8 | - | 47.1 | - | 49.8 | 100 | 100 | 88 | 1.6 | 8.6 | - | 0.04 | 13.85 | 0.034 | 149 | - | |
| Avg | - | - | - | - | 43.0 | 89 | - | - | 0.7 | - | - | - | - | - | - | - | |
| Min | 56.0 | - | 39.6 | - | -17.9 | 36 | 90 | 0 | 0.0 | 3.0 | - | 0.00 | 2.07 | 0.001 | 0 | - |
| Station | Date | Daily Max Temp (°F) | Time of Max Temp | Daily Min Temp (°F) | Time of Min Temp | Dew Pt (°F) | Daily Max RH (%) | Daily Min RH (%) | Wind Spd (mph) | Daily Max Wind (mph) | Time of Max Wind | Max Wind Dir (°) | Daily Rain (In) | Season Precip (In) | Daily ETo (in) | Daily Solar Rad (Cal/cm2) | Powdery Mildew Stress (pts) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Upper Rincon Valley | 12/18/25 | 53.0 10.5 | 1604 | 44.9 2.6 | 0419 | 48.2 4.5 | 98 0 | 86 23 | 0.9 1.2 | 5.7 4.6 | 0107 | NE | 41 | 0.00 | 5.40 | 0.018 0.013 | 87 50 | - |
| Lower Bennett Valley | 12/18/25 | 56.1 11.5 | 1556 | 35.4 4.0 | 0410 | 47.6 5.0 | 100 0 | 82 19 | 1.3 1.2 | 6.0 4.9 | 2134 | NNW | 341 | 0.01 | 6.78 | 0.019 0.019 | 89 72 | 0 0 |
| Kenwood (Wildwood) | 12/18/25 | 55.0 11.0 | 1445 | 41.8 0.8 | 0115 | 49.2 2.0 | 100 0 | 86 21 | 1.2 0.0 | 6.2 3.3 | 1517 | NNE | 15 | 0.02 | 7.28 | 0.017 0.013 | 74 48 | - |
| Sonoma Valley (Bedrock) | 12/18/25 | 55.3 10.2 | 1412 | 41.5 0.5 | 0240 | 47.9 2.4 | 98 0 | 79 14 | - | - | - | - | 0.00 | 6.95 | - | - | - |
| Sonoma-West (Arnold) | 12/18/25 | 61.6 4.1 | 1335 | 38.8 2.3 | 0210 | 49.1 2.1 | 100 0 | 65 5 | 1.3 0.3 | 6.3 5.5 | 0940 | N | 351 | 0.01 | 4.89 | 0.031 0.002 | 137 1 | - |
| Sonoma Valley HS | 12/18/25 | 60.1 5.7 | 1402 | 42.4 1.6 | 0152 | 50.4 2.1 | 100 0 | 76 8 | 0.6 0.6 | 4.2 4.1 | 1457 | N | 7 | 0.01 | 4.69 | 0.022 0.003 | 100 9 | - |
| Sonoma East (Bundschu01) | 12/18/25 | 61.6 4.4 | 1456 | 39.3 1.0 | 0120 | 48.6 2.9 | 98 0 | 65 4 | 1.0 1.6 | 5.5 5.5 | 1442 | W | 275 | 0.00 | 0.13 | 0.025 0.003 | 111 22 | - |
| Schellville (Sasaki) | 12/8/25 | 48.2 0.5 | 1512 | 42.7 0.1 | 0740 | 42.6 0.2 | 95 1 | 83 0 | 1.2 0.0 | 9.8 2.3 | 1356 | NE | 55 | 0.00 | 4.40 | - | - | 0 0 |
| Sonoma-SE (Napoli) | 12/18/25 | 64.1 2.5 | 1409 | 41.2 1.3 | 0122 | 48.6 2.9 | 96 1 | 60 0 | 0.3 1.7 | 5.8 5.4 | 1442 | WNW | 282 | 0.00 | 4.70 | - | - | 0 0 |
| Ricci Vineyards (Carneros) | 12/18/25 | 61.1 4.9 | 1409 | 42.4 0.7 | 0011 | 48.8 2.2 | 97 0 | 65 6 | 1.5 1.9 | 8.1 5.8 | 1441 | W | 265 | 0.01 | 5.24 | 0.025 0.009 | 112 37 | - |
| Carneros (Ranch 71) | 12/18/25 | 59.9 4.5 | 1445 | 44.9 2.2 | 0134 | 49.8 2.6 | 100 0 | 68 5 | 1.6 2.6 | 9.5 3.3 | 2115 | E | 88 | 0.01 | 4.72 | 0.023 0.002 | 105 5 | 0 0 |
| Carneros Upper (Ranch 81) | 12/18/25 | 60.1 4.3 | 1416 | 46.1 0.2 | 0039 | 18.2 15.4 | - | - | 1.7 3.9 | 7.6 9.7 | 0022 | W | 274 | - | - | - | - | - |
| Carneros Lower (Ranch 81) | 12/18/25 | 58.3 4.7 | 1418 | 44.5 2.2 | 0002 | 2.8 2.8 | 100 0 | 0 0 | 0.5 1.3 | 9.3 4.1 | 1431 | SSE | 148 | 0.00 | 5.05 | 0.017 0.030 | 47 21 | - |
| Rohnert Park-West (Stony Point) | 12/18/25 | 57.5 7.8 | 1515 | 42.2 2.4 | 0201 | 48.9 3.1 | 100 0 | 81 13 | 0.7 1.8 | 6.9 6.3 | 1232 | E | 100 | 0.00 | 1.56 | - | - | - |
| Cartograph Wines Base | 12/18/25 | 57.2 6.4 | 1418 | 43.0 3.5 | 0348 | 49.5 4.2 | 100 0 | 85 8 | 1.2 2.9 | 6.8 10.5 | 1421 | NNE | 27 | 0.01 | 6.92 | 0.024 0.014 | 116 74 | - |
| Cartograph Wines Remote | 12/18/25 | 57.1 5.5 | 1448 | 40.7 1.2 | 0159 | - | - | - | - | - | - | - | - | - | - | - | - |
| Rice-Spivak Vineyard | 12/18/25 | 60.0 4.9 | 1410 | 39.0 0.0 | 0157 | - | - | - | - | - | - | - | - | - | - | - | - |
| Penngrove (Asellus) | 12/18/25 | 59.5 6.8 | 1437 | 37.5 1.6 | 0158 | 47.3 3.5 | 98 0 | 70 11 | 1.7 0.0 | 6.5 2.3 | 0843 | WNW | 287 | 0.00 | 0.10 | - | - | 0 0 |
| Roger's Creek (Ranch 50) | 12/18/25 | 58.6 5.0 | 1427 | 46.8 0.9 | 0223 | 49.8 1.7 | 100 0 | 69 4 | 1.7 1.3 | 7.1 8.5 | 1518 | WNW | 289 | 0.01 | 6.20 | 0.022 0.006 | 96 22 | 0 0 |
| Petaluma (Ranch 10) | 12/18/25 | 62.9 7.4 | 1450 | 38.4 2.0 | 0150 | 48.0 2.5 | 100 0 | 62 10 | 0.5 0.5 | 6.2 4.5 | 1451 | NW | 309 | 0.00 | 4.51 | 0.022 0.016 | 94 48 | 0 0 |
| Max | 64.1 | - | 46.8 | - | 50.4 | 100 | 86 | 1.7 | 9.5 | - | - | 0.02 | 7.28 | 0.031 | 137 | - | |
| Avg | - | - | - | - | 44.3 | - | - | 1.1 | - | - | - | - | - | - | - | - | |
| Min | 53.0 | - | 35.4 | - | 2.8 | 96 | 0 | 0.3 | 4.2 | - | - | 0.00 | 0.10 | 0.017 | 47 | - |