What are the Elements of Vintage Analysis Statistics and Extreme Temperature Indices (ETIs)?

Extreme Temperature Indices are a yearly record of heat stress on grapevine. The most relevant ETIs are the number of:
Extreme Heat Days Tmax > 35°C – the numbers of days when the maximum air temperature reaches and exceeds 35°C value.
Hot Days Tmax > 30°C – the number of days when the maximum air temperature reaches and exceeds 30°C value.
Summer Days Tmax > 25°C – the number of days when the maximum air temperature reaches and exceeds 25°C value.
Frost Days Tmin < 0°C – the number of days when the minimum air temperature is under zero (0°C) Celsius Grad.
Icy Days Tmin < -10°C – the number of days when the minimum air temperature is under minus 10° Celsius Grad.

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