Ostuncalco, Guatemala experiences a mild climate throughout the year. During winter months (December and January), temperatures are relatively cool, ranging from near-freezing to warm days, averaging around 18-21°C. As spring approaches (February to May), temperatures gradually rise, with average highs reaching up to 36°C. Summer months (June to September) bring more stable temperatures, with averages around 20°C, although occasional cooler nights occur in July. Autumn (October and November) sees a slight dip in temperature, but still enjoys warm days and cool nights.