| 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Montesol | 8/31/26 | 75.0 9.7 | 1051 | 47.8 2.9 | 0048 | - | - | - | - | - | - | - | 0.00 | 0.00 | - | - | 90 20 |
| Pope Valley (Weeks Lake) | 8/31/26 | 80.1 9.5 | 1542 | 45.3 2.7 | 0611 | 49.4 2.5 | 100 0 | 34 17 | 2.2 0.6 | 15.8 2.8 | 1316 | SE | 125 | 0.00 | 0.00 | 0.162 0.022 | 525 12 | 20 20 |
| Dollarhide Base | 8/31/26 | 81.4 11.7 | 1616 | 52.7 2.0 | 0640 | 53.7 1.4 | 95 1 | 41 20 | 4.3 1.5 | 19.2 5.0 | 1743 | SSW | 197 | 0.00 | 0.00 | 0.184 0.031 | 575 14 | 20 20 |
| Dollarhide 1AS Remote | 8/31/26 | 80.6 13.0 | 1623 | 46.5 2.6 | 0644 | 51.4 1.6 | 93 2 | 40 18 | 3.9 1.5 | 21.4 6.7 | 1632 | SSW | 198 | - | - | - | - | 20 20 |
| Dollarhide 16A Remote | 8/31/26 | 78.9 13.6 | 1538 | 50.4 1.4 | 0645 | 53.5 1.7 | 97 2 | 44 23 | - | - | - | - | - | - | - | - | 20 20 |
| Dollarhide 18A Remote | 8/31/26 | 79.3 11.5 | 1554 | 42.7 0.9 | 0622 | 50.4 1.5 | 96 2 | 42 20 | - | - | - | - | - | - | - | - | 20 20 |
| Hardin Rd (Eakle) | 8/31/26 | 80.3 10.6 | 1532 | 48.7 2.2 | 0704 | - | - | - | - | - | - | - | - | - | - | - | 20 20 |
| Angwin | 8/31/26 | 70.9 10.5 | 1505 | 51.1 9.0 | 0059 | 48.6 3.5 | 100 46 | 46 24 | 2.6 1.2 | 15.5 0.4 | 1624 | SE | 138 | 0.00 | 0.00 | 0.028 0.036 | 0 0 | 90 10 |
| Lower Angwin (Pioneer) | 8/31/26 | 72.7 10.0 | 1612 | 40.6 1.4 | 0235 | - | - | - | 3.2 1.3 | 13.4 2.3 | 0012 | W | 261 | - | - | - | - | 90 10 |
| Las Posadas (Cal Fire) | 8/31/26 | 74.2 10.2 | 1541 | 51.2 2.9 | 0630 | 51.6 0.8 | 98 6 | 45 16 | 9.9 2.3 | 24.1 6.0 | 2143 | WSW | 247 | 0.00 | 0.00 | 0.155 0.049 | 515 22 | - |
| Deer Park | 8/31/26 | 78.6 6.5 | 1559 | 54.5 1.7 | 0722 | 51.9 0.3 | 92 0 | 38 6 | 3.7 0.1 | 14.0 3.2 | 1855 | SW | 235 | 0.00 | 0.00 | 0.118 0.027 | 332 44 | 50 10 |
| Lower Chiles Valley (Brown) | 8/31/26 | 76.2 10.6 | 1533 | 52.1 4.7 | 0637 | 51.5 0.5 | 93 1 | 39 13 | 3.9 0.1 | 15.3 1.5 | 1224 | WNW | 299 | 0.00 | 0.01 | 0.163 0.025 | 558 21 | 20 10 |
| Moss Creek Vineyard/Reservior | 8/31/26 | 77.6 13.2 | 1551 | 49.4 1.3 | 0653 | 50.5 1.0 | 95 1 | 37 17 | - | - | - | - | 0.00 | 0.00 | - | - | 20 20 |
| Max | 81.4 | - | 54.5 | - | 53.7 | 100 | 46 | 9.9 | 24.1 | - | - | 0.00 | 0.01 | 0.184 | 575 | - | |
| Avg | - | - | - | - | 51.2 | - | - | 4.2 | - | - | - | - | - | - | - | - | |
| Min | 70.9 | - | 40.6 | - | 48.6 | 92 | 34 | 2.2 | 13.4 | - | - | 0.00 | 0.00 | 0.028 | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Calistoga-North | 8/31/26 | 79.7 12.8 | 1519 | 56.9 10.8 | 0632 | 54.6 1.6 | 90 6 | 41 10 | - | - | - | - | 0.00 | 0.00 | - | - | 20 20 |
| Diamond Mtn (Schramsberg) | 8/31/26 | 76.2 8.0 | 1524 | 53.0 0.9 | 0717 | 52.0 0.3 | 100 0 | 39 6 | - | - | - | - | 0.00 | 0.00 | - | - | 50 10 |
| Diamond Mtn (McEachran) | 8/31/26 | 79.6 6.2 | 1512 | 55.5 3.8 | 0633 | 52.6 1.2 | 91 1 | 38 6 | - | - | - | - | - | - | - | - | 20 10 |
| St. Helena-North | 8/31/26 | 79.7 6.4 | 1541 | 56.9 8.6 | 0537 | 50.9 0.6 | 82 7 | 34 4 | 2.9 | 13.4 0.2 | 1342 | SSE | 150 | 0.00 | 0.00 | 0.137 0.039 | 436 50 | 0 0 |
| St. Helena (NVV Office) | 8/31/26 | 80.9 3.6 | 1547 | 57.4 8.3 | 0618 | - | - | - | 2.1 | 11.8 1.4 | 1643 | WNW | 289 | 0.00 | 0.00 | - | - | 20 10 |
| Tiara Fria (East St. Helena) | 8/31/26 | 79.3 3.9 | 1603 | 57.2 10.4 | 0952 | 52.4 0.7 | 86 6 | 39 2 | 2.9 | 13.4 2.8 | 1733 | WSW | 255 | 0.00 | 0.00 | - | - | 50 10 |
| Prisoner Winery | 8/31/26 | 81.4 5.7 | 1529 | 53.5 8.3 | 0036 | 52.2 0.1 | 96 3 | 34 1 | 1.7 | 13.2 4.5 | 1703 | SSW | 200 | 0.00 | 0.00 | 0.025 0.001 | 0 0 | 20 20 |
| Rutherford Hill Estate | 8/31/26 | 80.2 4.0 | 1644 | 55.6 4.4 | 0928 | 52.4 0.8 | 92 1 | 37 3 | 1.8 | 15.1 3.9 | 1433 | S | 171 | 0.00 | 0.00 | 0.131 0.021 | 432 57 | 50 10 |
| Rutherford-North (Mee Ln) | 8/31/26 | 79.7 2.7 | 1551 | 54.0 11.2 | 0101 | 51.9 1.4 | 91 2 | 37 0 | 3.6 | 20.4 5.1 | 1544 | E | 91 | 0.00 | 0.00 | 0.134 0.025 | 405 56 | 50 10 |
| Rutherford (STS) | 8/31/26 | 81.2 3.0 | 1507 | 54.9 11.8 | 2149 | 54.5 1.6 | 91 0 | 43 2 | 2.7 | 15.8 2.6 | 1744 | W | 259 | 0.00 | 0.00 | 0.150 0.026 | 484 68 | 80 20 |
| Oakville-NE (Ranch 88) | 8/31/26 | 79.2 3.2 | 1641 | 56.4 13.2 | 2244 | 50.8 1.2 | 87 9 | 37 2 | 2.9 | 15.1 0.1 | 1405 | SSE | 168 | 0.00 | 0.00 | 0.136 0.028 | 412 68 | 100 0 |
| OV561-East | 8/31/26 | 82.7 0.9 | 1606 | 57.1 11.3 | 2258 | - | - | - | - | - | - | - | - | - | - | - | 50 10 |
| Oakville | 8/31/26 | 77.2 2.0 | 1605 | 56.0 12.1 | 2253 | 52.0 1.2 | 86 5 | 41 0 | 4.6 | 16.4 0.8 | 1436 | ESE | 114 | 0.00 | 0.00 | 0.152 0.023 | 481 58 | 90 10 |
| OV518-West | 8/31/26 | 76.1 3.4 | 1527 | 56.5 12.2 | 0920 | - | - | - | - | - | - | - | - | - | - | - | 90 10 |
| To Kalon Remote (TKKE) | 8/31/26 | 80.4 2.9 | 1550 | 56.7 11.7 | 0015 | - | - | - | - | - | - | - | - | - | - | - | 50 10 |
| To Kalon | 8/31/26 | 78.9 1.7 | 1525 | 56.7 10.8 | 0928 | 53.1 0.5 | 93 3 | 40 1 | 4.0 | 16.1 0.5 | 1925 | SW | 236 | 0.00 | 0.00 | 0.140 0.028 | 445 53 | 80 10 |
| To Kalon Remote (TKN5) | 8/31/26 | 80.1 3.8 | 1531 | 57.2 11.6 | 0840 | - | - | - | - | - | - | - | - | - | - | - | 50 10 |
| Yountville (Ranch 67) | 8/31/26 | 75.2 2.6 | 1537 | 55.0 11.6 | 0858 | 51.0 0.8 | 82 9 | 41 1 | 4.3 | 15.6 0.3 | 1618 | SSE | 160 | 0.00 | 0.00 | 0.147 0.025 | 497 92 | 90 10 |
| Stags Leap Dist (Silverado Vineyards) | 8/31/26 | 75.6 3.1 | 1533 | 55.2 11.7 | 0913 | 51.3 0.9 | 83 9 | 41 2 | 2.8 | 14.8 2.5 | 1356 | SSW | 192 | 0.00 | 0.00 | 0.131 0.035 | 424 88 | 100 20 |
| Borreo (Soda Canyon) | 8/31/26 | 73.3 5.0 | 1555 | 53.1 6.9 | 0842 | 51.0 0.3 | 90 5 | 45 6 | 2.5 | 12.0 2.5 | 1341 | SE | 126 | 0.00 | 0.00 | 0.131 0.025 | 451 79 | 100 20 |
| Wappo Hill Floor | 8/31/26 | 76.3 3.3 | 1528 | 55.8 12.4 | 0853 | 52.3 0.7 | 84 16 | 43 2 | 3.3 | 14.9 0.1 | 1346 | SE | 137 | 0.00 | 0.00 | 0.141 0.024 | 454 68 | 90 10 |
| Stags Leap Dist (Chimney Rock) | 8/31/26 | 75.7 3.0 | 1507 | 55.9 13.1 | 0850 | 54.1 1.0 | 87 11 | 50 2 | 3.2 | 13.9 1.8 | 1600 | S | 188 | 0.00 | 0.00 | 0.123 0.022 | 399 73 | 90 10 |
| Yountville-South (Ranch 87) | 8/31/26 | 77.3 4.3 | 1504 | 55.7 11.3 | 0851 | 52.7 0.6 | 89 11 | 42 3 | 2.6 | 14.8 3.7 | 1430 | SSE | 156 | 0.00 | 0.00 | 0.139 0.019 | 450 61 | 80 20 |
| Yountville-SE (Ranch 85) | 8/31/26 | 75.6 2.1 | 1519 | 55.5 10.3 | 0853 | 53.0 0.4 | 88 6 | 44 1 | 2.2 | 12.8 0.2 | 1329 | SE | 146 | 0.00 | 0.00 | - | 0 0 | 90 10 |
| Oak Knoll-East (Ranch 53) | 8/31/26 | 75.8 3.3 | 1531 | 55.4 9.3 | 0826 | 51.9 0.3 | 89 2 | 42 3 | 2.6 | 14.1 0.7 | 1547 | SW | 222 | 0.00 | 0.00 | 0.138 0.024 | 454 81 | 90 10 |
| Napa-NW (Ranch 54) | 8/31/26 | 76.4 4.3 | 1537 | 50.4 3.4 | 0141 | 51.8 0.0 | 90 2 | 42 3 | 1.7 | 13.0 6.3 | 1730 | SSE | 168 | 0.00 | 0.00 | - | 0 0 | 90 10 |
| Napa-North (Ranch 29) | 8/31/26 | 75.5 1.4 | 1500 | 55.7 9.0 | 0751 | 52.9 0.0 | 88 12 | 46 1 | 3.1 | 15.5 2.0 | 1512 | SW | 215 | 0.00 | 0.00 | 0.111 0.000 | 342 2 | 90 10 |
| Max | 82.7 | - | 57.4 | - | 54.6 | 100 | 50 | 4.6 | 20.4 | - | - | 0.00 | 0.00 | 0.152 | 497 | - | |
| Avg | - | - | - | - | 52.3 | - | - | 2.9 | - | - | - | - | - | - | - | - | |
| Min | 73.3 | - | 50.4 | - | 50.8 | 82 | 34 | 1.7 | 11.8 | - | - | 0.00 | 0.00 | 0.025 | 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) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mt. Veeder | 8/31/26 | 69.4 9.7 | 1349 | 49.0 2.7 | 0730 | 50.7 0.5 | 100 5 | 51 11 | 1.8 | 13.6 3.2 | 1432 | SSE | 156 | 0.00 | 0.00 | 0.133 0.026 | 526 36 | 90 10 |
| Mount George (Napa East) | 8/31/26 | 73.3 3.3 | 1509 | 54.7 5.0 | 0750 | 52.2 0.3 | 86 10 | 47 7 | 2.3 | 13.9 3.9 | 1646 | W | 279 | 0.00 | 0.00 | 0.123 0.027 | 426 96 | 60 10 |
| Napa-East (Palmaz 300') | 8/31/26 | 78.3 3.3 | 1511 | 55.5 3.5 | 0726 | 52.6 0.1 | 85 15 | 40 5 | 0.5 | 16.3 5.6 | 1708 | SW | 231 | 0.00 | 0.00 | 0.112 0.021 | 380 61 | 60 10 |
| Napa-East (Palmaz 1200') | 7/3/26 | 79.0 6.0 | 1616 | 49.0 3.8 | 0539 | 47.1 0.2 | 100 0 | 45 38 | 2.0 | 12.7 4.5 | 1533 | NW | 313 | - | - | 0.192 0.009 | 656 3 | 30 20 |
| Napa-East (Palmaz 1400') | 8/31/26 | 68.5 6.4 | 1532 | 50.1 0.3 | 0736 | 52.4 0.2 | 100 0 | 56 11 | 4.2 | 18.4 6.1 | 1648 | SSW | 193 | 0.00 | 0.03 | 0.110 0.041 | 414 116 | 70 10 |
| Wooden Valley | 8/31/26 | 72.2 8.8 | 1527 | 53.1 1.0 | 0742 | 51.6 0.9 | 88 0 | 47 13 | 5.1 | 18.6 5.3 | 1744 | SSW | 207 | 0.00 | 0.00 | 0.142 0.039 | 525 55 | 50 10 |
| Napa-West Upper (Truchard) | 8/31/26 | 77.3 1.5 | 1445 | 52.9 1.4 | 0618 | 44.0 10.4 | 100 0 | 0 41 | 5.2 | 21.3 8.9 | 1637 | SSW | 199 | 0.00 | 0.00 | 0.151 0.014 | 460 65 | 90 10 |
| Napa-West Lower (Truchard) | 8/31/26 | 78.7 0.2 | 1444 | 44.9 2.5 | 0204 | 51.6 1.0 | 94 0 | 39 2 | - | - | - | - | - | - | - | - | 90 10 |
| Napa-South (Toyon Farms) | 8/31/26 | 74.7 0.7 | 1439 | 53.3 2.3 | 0625 | 54.7 0.6 | 96 1 | 52 1 | 4.6 | 17.7 4.4 | 1737 | SSW | 200 | 0.00 | 0.00 | 0.089 0.000 | 265 17 | 60 10 |
| Toyon Remote 1 | 8/31/26 | 77.3 1.6 | 1508 | 0.0 46.0 | 0100 | - | - | - | - | - | - | - | - | - | - | - | - |
| Toyon Remote 2 | 8/31/26 | 75.2 0.5 | 1438 | 50.6 4.5 | 0617 | - | - | - | - | - | - | - | - | - | - | - | - |
| Toyon Remote 3 | 8/31/26 | 77.9 1.1 | 1506 | 48.1 2.3 | 0153 | - | - | - | - | - | - | - | - | - | - | - | - |
| Dealy Lane (Ranch 80) | 8/31/26 | 75.1 0.8 | 1439 | 50.4 1.8 | 0130 | 51.9 0.0 | 92 0 | 44 2 | 3.0 | 20.2 5.8 | 1956 | W | 265 | 0.00 | 0.00 | 0.133 0.022 | 444 79 | 90 10 |
| Carneros (Saintsbury) | 8/31/26 | 73.9 0.7 | 1439 | 49.3 3.3 | 0227 | 51.6 0.2 | 98 2 | 46 1 | 5.9 | 21.4 6.7 | 1726 | SW | 221 | 0.00 | 0.00 | - | - | 80 10 |
| Suscol Lower (Ranch 35) | 8/31/26 | 74.4 0.8 | 1555 | 54.0 2.5 | 0633 | 52.2 0.4 | 88 4 | 44 0 | 6.8 | 20.2 6.2 | 1724 | SW | 218 | 0.00 | 0.00 | 0.135 0.010 | 391 77 | 70 10 |
| Suscol Mtn (Ranch 93) | 8/31/26 | 74.4 4.4 | 1508 | 51.4 2.3 | 0650 | 52.5 1.1 | 97 0 | 52 8 | 11.0 | 30.7 15.6 | 1720 | WNW | 295 | 0.00 | 0.00 | - | - | 70 10 |
| Suscol Upper (Ranch 92) | 8/31/26 | 70.1 5.1 | 1521 | 52.4 1.4 | 0654 | 48.8 10.6 | 100 0 | 0 0 | 7.1 | 24.5 12.1 | 1756 | WSW | 241 | 0.00 | 0.00 | - | - | 40 10 |
| Stanly (Ranch 45) | 8/31/26 | 74.4 0.9 | 1505 | 53.3 7.2 | 0626 | 52.5 0.1 | 88 6 | 46 2 | 6.4 | 20.0 5.9 | 1823 | SW | 233 | 0.00 | 0.00 | 0.152 0.017 | 480 88 | 80 10 |
| Carneros Upper (Ranch 81) | 8/31/26 | 73.0 4.4 | 1426 | 52.1 2.6 | 0548 | 52.0 0.2 | - | - | 10.0 | 29.6 12.9 | 1636 | WSW | 245 | - | - | - | - | 60 10 |
| Carneros (Mitsuko) | 8/31/26 | 75.0 0.5 | 1414 | 46.1 1.8 | 0202 | - | - | - | - | - | - | - | - | - | - | - | 80 10 |
| Carneros Lower (Ranch 81) | 8/31/26 | 79.6 2.9 | 1529 | 50.1 2.4 | 0157 | 52.7 0.8 | 98 2 | 41 4 | 0.8 | 14.8 3.1 | 1434 | SSE | 166 | 0.00 | 0.00 | 0.011 0.013 | 0 0 | 60 10 |
| Carneros (Milton Rd) | 8/31/26 | 75.2 1.0 | 1436 | 51.7 5.3 | 0612 | 52.4 0.0 | 90 2 | 44 5 | - | - | - | - | 0.00 | 0.00 | - | - | 80 10 |
| Max | 79.6 | - | 55.5 | - | 54.7 | 100 | 56 | 11.0 | 30.7 | - | - | 0.00 | 0.03 | 0.152 | 526 | - | |
| Avg | - | - | - | - | 51.6 | - | - | 5.0 | - | - | - | - | - | - | - | - | |
| Min | 68.5 | - | 0.0 | - | 44.0 | 85 | 0 | 0.5 | 13.6 | - | - | 0.00 | 0.00 | 0.011 | 0 | - |