In December, Siwan typically sees daytime highs of 23.9°C and overnight lows around 9.8°C. Compared to the annual average high of 31.0°C, December runs -7.1°C.
December in Siwan averages a daytime high of 23.9°C and an overnight low of 9.8°C.
December runs -7.1°C compared to Siwan's annual average high of 31.0°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 23.9°C and cooler evenings around 9.8°C.