Some stats for Buriram weather 2017. All stats are from Thai Met Dept.
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Av min temp was 17.5 (Dec'16 was 18.4)
Av max temp was 29.5 (Dec'16 was 29.7)
Total rainfall was 2.3mm (Dec'16 was 0.0mm)
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If you felt a bit chilly just prior to Christmas, you'd be right. Check out the daily stats for 18th-21st on the attached sheet.