In December, Sleman typically sees daytime highs of 29.8°C and overnight lows around 21.3°C. Compared to the annual average high of 29.9°C, December runs -0.1°C.
December in Sleman averages a daytime high of 29.8°C and an overnight low of 21.3°C.
December runs -0.1°C compared to Sleman's annual average high of 29.9°C, ranking #8 of 12 months by warmth.
Plan for daytime highs near 29.8°C and cooler evenings around 21.3°C.