November-February: Cool and dry. Average mid-day temperatures in the mid 20s, sometime dipping below 20 at night. The monsoon rains trail off through October and November, and have usually stopped completely by mid November. These months - November through February - are generally considered to be the best time of year to visit, with December and January offering the very best weather of the year across the country - comfortably warm days, clear skies, no rain, light breeze, cool evenings. Ideal beach weather in
Sihanoukville. A comfortable time of year to visit the temples near
Siem Reap. Temperatures begin to creep up a bit through February and there are occasional, short 'mango showers' in the afternoon.
text courtesy: canbypublications.com
picture courtesy: forevergeek.com