Kilimanjaro can be trekked all year, with advantages and disadvantages each month. Mid-December, Jan, Feb and March are the warmest months, almost clear of clouds. April and early May cloud get heavy rain or snow, but is good if you want a quiet clear mountain. By late June, July and through August it can be very cold at night but the sky is clear above 3,000 meters so there are great views. Through September and October it gets steadily warmer. October is particularly good if you want little or no rain, mild weather and few people on the mountains. November to mid-December is the short rains season. Possibly afternoon thunderstorms but tends to clear in evening with good views at night and mornings. There can be heavy snow towards the summit.