Climate Overview
The climate in Sungai Sumun is cold. The average annual temperature is -46°C and approximately 142mm of precipitation falls per year. September is the wettest month, receiving around 17mm of rainfall. Sungai Sumun sits near the equator, so seasonal temperature differences are minimal throughout the year. Snowfall occurs from January to December, with around 142cm accumulating over the season.
Temperature
Sungai Sumun sees moderate temperature variation throughout the year, ranging from -53°C to -42°C. June is the warmest month, though highs remain moderate at -42°C with a mean of -44°C. December brings the harshest conditions, with lows dropping to -53°C and an average temperature of -48°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows.
Precipitation
Sungai Sumun is a quite dry location, receiving approximately 142mm of precipitation annually, which averages out to around 12mm per month. The wettest month is September, averaging 17mm of rainfall. October and August also tend to see above-average precipitation. The driest month is April, with just 8mm. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 142cm accumulating over the season. September typically sees the most snow at around 17cm.
Wind
Sungai Sumun is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 3km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.
Seasons
16 days until Autumn
It is currently summer in Sungai Sumun, which began on June 21, 2026. Sungai Sumun sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in June at around -42°C, while the coldest stretch bottoms out in December near -53°C. Autumn is next, beginning on September 23, 2026 — 16 days from now.
Spring
Temperatures range from -48 to -42°C. Precipitation is minimal, with only around 24mm for the entire season. Winds are generally light, averaging 6km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from -48 to -42°C. Precipitation is minimal, with only around 39mm for the entire season. Winds are generally light, averaging 4km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from -51 to -44°C. Precipitation is minimal, with only around 46mm for the entire season. Expect around 46cm of snow accumulation during this period. Winds are generally light, averaging 4km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from -53 to -45°C. Precipitation is minimal, with only around 32mm for the entire season. Expect around 32cm of snow accumulation during this period. Winds are generally light, averaging 4km/h. Heavy layering and insulated outerwear are essential — exposed skin should be minimised outdoors.
Monthly Climate Data
The table below shows monthly climate averages for Sungai Sumun based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
