Chetwynd: are you wondering about the weather you might find during your holiday? Befor organizing a holiday we always think about the wheather we might find when we get there. In Chetwynd the average yearly temperature is 9°C. During the hottest month, which in this case is July, the temperature can get up to 22°C. Instead the coldest month is December, reaching a minimum temperature of -5°C. The wettest month is February, during which we can predict 8 days of rain.