Call a day "very hot" if its highest temperature is 34 °C or more.

The month, in degrees Celsius: $31, 32, 30, 33, 34$, $33, 31, 29, 28, 30$, $32, 33, 35, 34, 32$, $31, 30, 29, 28, 27$, $29, 31, 32, 33, 31$, $30, 28, 27, 29, 30$. It rained on days $8, 9, 10$, $17$ to $20$ and $27$ to $29$. Relative frequency = successes divided by tries. It estimates the probability, and a long run settles close to the true value.