Climate Overview
The climate in Harper is hot. The average annual temperature is 26°C and approximately 2056mm of precipitation falls per year. Harper receives a notable amount of rainfall throughout the year, including during its driest month. Harper sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Harper has relatively stable temperatures year-round, staying within a 3°C range. The warmest month is April, when average highs reach 28°C and the mean temperature sits around 27°C. August is the coolest month, with minimum temperatures around 25°C and an average of 25°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows.
Precipitation
Harper is a very wet location, receiving approximately 2056mm of precipitation annually, which averages out to around 171mm per month. The wettest month is June, averaging 365mm of rainfall. May and September also tend to see above-average precipitation. The driest month is January, with just 57mm. That's 308mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Harper is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is August, 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. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.
Seasons
93 days until Autumn
It is currently summer in Harper, which began on June 21, 2026. Harper sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in April at around 28°C, while the coldest stretch bottoms out in August near 25°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.
Spring
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 599mm across the season with a monthly average of 200mm. Winds are generally light, averaging 4km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 27°C. Rainfall is heavy, totalling around 627mm across the season with a monthly average of 209mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 25 to 27°C. Rainfall is heavy, totalling around 606mm across the season with a monthly average of 202mm. Winds are generally light, averaging 4km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 26 to 28°C. Precipitation is moderate at around 224mm for the season, averaging 75mm per month. Winds are generally light, averaging 3km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Harper 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. 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.
