Cold temperatures can harm marijuana plants. The most significant advantage of chilly weather is that it deters bugs. Plants cultivated outside require daytime temperatures in the mid-60s (18C) or above; otherwise, their development would begin to decrease considerably and eventually halt. Evening temperatures must be in the 40s (5C). Tissue loss may occur if this is not done. You may have difficulty when the temperature falls below 45 degrees Fahrenheit (7C).