Some days in the winter and spring can be warm and extremely dry, with Chinook winds often raising temperatures to near 70 °F (21 °C) in January and February, and sometimes to near 90 °F (32 °C) in April. Windsor's elevation and low year-round humidity means that nighttime low temperatures are practically never above 68 °F (20 °C), even in the very hottest part of the summer. The diurnal temperature range is usually rather wide, with a 50-degree (Fahrenheit) difference between daytime high and nighttime low not uncommon, especially in the spring and fall months. Rapid fluctuation in temperature is also common – a sunny 80 °F (27 °C) October afternoon can easily give way to a 28 °F (-2 °C) blizzard within 12 hours.