Bower,
I did not make the graphs. These are graphs from the weather station CHI, which is 2 km from my garden. Performs measurements since 1939 and graphs are on the internet.
On the chart also indicated average values for 75 years of measurements (max and min).
I will use their graphs for the evaluation hardiness of tomatoes in this season (I do not have to perform any temperature measurement)
Vladimír
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