WINETECH Technical Yearbook 2020

FIGURE 2. Average seasonal temperature frequency analysis, total observed hours at each threshold level 1-9 for four seasons (S1-S4) over study sites, a) SomersetW, b) Elgin, c) Stellenbosch2, d) Vredendal, e) Stellenbosch1, and f) Stellenbosch3.

FIGURE 3. Temperature (T), relative humidity (RH) and wind speed (U) frequency analyses as total observed hours at each threshold level for four seasons (S1-S4) for the month of January for Elgin (left), SomersetW (middle) and Vredendal (right). a) T Elgin, b) T SomersetW, c) T Vredendal, d) RH Elgin, e) RH SomersetW, f) RH Vredendal, g) U Elgin, h) U2 SomersetW, and i) U2 Vredendal.

TABLE 2. Classification of the viticultural climate (mean) of six viticulture mesoclimates in the Western Cape, South Africa by class of climatic viticultural index DI, HI and CI of the Geoviticulture MCC System.

HI-3

HI-2

HI-1

HI+1

HI+2

HI+3

CI+1

CI-1 CI-2 CI+2

CI+1

CI-1

CI+1

CI-1 CI-2 CI+2 CI+1

CI-1

CI+2 CI+1 CI-1 CI-2 CI+2 CI+1 CI-1 CI-2 CI+2

CI-2 CI+2

CI-2

ELGIN S1 S2 S3 S4

SOM S2 SOM S4 SOM S1 S3

DI-2

STEL3 S2

STEL2 S2 STEL3 S1

STEL2 S1 STEL2 S3 S4

STEL1 S1

DI-1

STEL3 S3S4

STEL1 S2 STEL1 S3 S4

DI+1

VRED S1 S2 S3 S4

DI+2

WINETECH TECHNICAL YEARBOOK 2020 27