2015 Winegrowing Conditions: June
The 2015 winegrowing season warmed up nicely during June in the Petaluma Gap. Average mean, low and maximum temperatures meant that Diurnal Variations were exactly that, average. June's warming trend provided an increase in growing degree days over last year. June 2015 saw a bit more sunlight than average but a bit less than last year. Wind conditions in June were slightly calmer than historical averages by while also being a bit windier than last year. June's humidity exactly mirrored last years levels while exceeding historical averages.
The average mean temperature in June of 59.3˚F was 2.9˚F warmer than 2014 and on par with historical averages. Maximum daily temperatures were slightly lower than June 2014 (0.8˚F) and again equivalent to maximum averages for June. Minimum daily temperatures were 10.1˚F higher than last year while only 0.5˚F higher than historical averages.
Average mean, low and maximum temperatures meant that Diurnal Variations were exactly that, an average 29.1˚F. These average variations were 10.9˚F less than last June.
Diurnal variation relates to the daily temperature differences between the highs and the lows. Higher variations create conditions for high sugar production while preserving more natural acidity.
June's warming trend provided an increase in growing degree days over last year (52.3 or 23.2%). However, average GDDs in June slightly surpassed last month by 17.9 or 6.0%.
Growing degree days measures heat accumulation and is used to predict rates of grape development. Measured from April through October, the Sonoma Coast's maritime climate averages 2,185 degree day units (GDUs).
June 2015 saw a bit more sunlight than average (13.7 Ly/Day or 2.1%) but a bit less than last year (33 Ly/Day or 5%).
Wind conditions in June were slightly calmer than historical averages by 3.1% while also being a bit windier than last year (9%).
(-2.4%) at 4.0 mph. This May's average wind conditions were identical to last year.
June's humidity exactly mirrored last years levels while exceeding historical averages by a slight 1.0 or 1.4%.
Analyses of the climatic influences affecting current growing conditions such as Temperature, Solar Radiation, Wind and Humidity. Weather analyses are based on regional data obtained from the California Irrigation Management Information Systems (CIMIS) Stations and only characterize general growing conditions for the region.