Tuesday, October 10, 2017

10 Years of Climate Data - Time Flys...

The old saying could not be more true "time flys when your having fun" and ten years have gone by since we started capturing climate data at Arrow lakes Vineyard. In 2008, we started capturing climate data. This was the year after we planted the first Leon Millot vines in 2007. So after 10 years of climate data we have a good picture of the climate conditions at Arrow Lakes Vineyard. Its no secret that the vineyard potential in the region is excellent and Sunset Ridge Vineyard in Nakusp is a great example. I think when you combine this information with other regional climate info, like what is being done though the Arrow Lakes Grape Growers Society in Burton, one can see that the area from Nakusp to Edgewood is excellent for growing grapes.

We have posted the annual climate data on the blog from the start so anyone could see first hand what is happening climatically at Arrow lakes Vineyard. Over the years we've also made some observations about what has been valuable in making the best out of our vineyard site. So here are the 10 year details and averages for Arrow Lakes Vineyard followed by a few observations;

Monthly Averages
May. 12.7c
June. 15.9c
July.  19.9c
August.  19.4c
September.  13.9c

Avareage Annual Degree Days Growing is 995 (celcius)
Coldest Day in 10 years is December 18, 2008 at -25c
Average Annual coldest day is -20.3c
Average Frost Free Days is 152

1 - Using wind break to block or divert cold air from entering the vineyard has increased the heat accumulation from 5-10% over the summer. It appears to have limited the depth and duration of winter deep freeze events. It also appears to have limited the likelyhood of late spring frost or early fall frost.

2 - Clearing the land and increasing the size of area cleared seems to have increased the day time temperatures in the cleared area. The bigger the cleared area the more noticeable the change.

3 - Cultivating the area between the rows brings the vines into bud break faster than areas with out between row cultivation (with grass). It also appears that the bare cultivated ground heats up faster during the day and continues to radiate heat in the evenings for some time. This has proven very important in the fall during the ripening period. In addition, the rain or other moisture that falls or accumulates (such as dew) is absorbed into the soil and used by the vines instead of being used by surface grass or weeds.