In the high desert of the US southwest (6000'/1800m and above), it is not unusual to see diurnal temperature swings of 30F/16C or close to it. It's completely normal for at least 2 seasons a year to need an insulated jacket in the morning and evening, a light sweater just after and before the jacket is removed/added, and a t-shirt or similar for the middle of the day. Of course, the chance of rain is close to zero outside of any monsoon season that may or may not occur.