Climate Insights for Charlestown

The climate in Charlestown is temperate. The average annual temperature is 16°C and approximately 960 mm of precipitation falls per year. December is the wettest month, receiving around 182 mm of rainfall. Charlestown is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: December, January, February. The coldest months are July, June, August, when temperatures can drop to 4°C. Light snow can occur between September and September.The climate in Charlestown is temperate. The average annual temperature is 61°F and approximately 37.8 in of precipitation falls per year. December is the wettest month, receiving around 7.2 in of rainfall. Charlestown is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: December, January, February. The coldest months are July, June, August, when temperatures can drop to 39°F. Light snow can occur between September and September.

Temperatures in Charlestown vary considerably across the year, with a 21°C difference between the coldest and warmest months. The warmest month is December, when average highs reach 25°C and the mean temperature sits around 19°C. July is the coolest month, with minimum temperatures around 4°C and an average of 11°C. On average, daily temperatures fluctuate by about 13°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 3°C shift in average temperatures.Temperatures in Charlestown vary considerably across the year, with a 39°F difference between the coldest and warmest months. The warmest month is December, when average highs reach 78°F and the mean temperature sits around 67°F. July is the coolest month, with minimum temperatures around 39°F and an average of 51°F. On average, daily temperatures fluctuate by about 23°F between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 6°F shift in average temperatures.

Charlestown is a moderately rainy area, receiving approximately 960 mm of precipitation annually, which averages out to around 80 mm per month. The wettest month is December, averaging 182 mm of rainfall. January and February also tend to see above-average precipitation. The driest month is June, with just 6 mm. That's 176 mm less than December, 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. Light snowfall can occur between September and September, totalling around 5cm annually. September is the snowiest month with approximately 4cm.Charlestown is a moderately rainy area, receiving approximately 37.8 in of precipitation annually, which averages out to around 3.1 in per month. The wettest month is December, averaging 7.2 in of rainfall. January and February also tend to see above-average precipitation. The driest month is June, with just 0.2 in. That's 6.9 in less than December, 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. Light snowfall can occur between September and September, totalling around 2in annually. September is the snowiest month with approximately 2in.

Charlestown is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.Charlestown is mildly breezy, with an average annual wind speed of 6mph. For context, sustained winds below 7mph are generally light, while anything above 16mph is considered strong. The windiest month is September, averaging 7mph, though still comfortable for most outdoor activities. The calmest conditions occur in March, with average winds dropping to 5mph, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2mph gap between the calmest and windiest months.

The best time to visit Charlestown is during March, April, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 77 mm per month. By contrast, December can be uncomfortably hot with highs reaching 25°C, while July is the coldest period with lows dropping to 4°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.The best time to visit Charlestown is during March, April, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 63°F with modest rainfall averaging 3 in per month. By contrast, December can be uncomfortably hot with highs reaching 78°F, while July is the coldest period with lows dropping to 39°F. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Charlestown 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.The table below shows monthly climate averages for Charlestown based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Fahrenheit (°F). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in inches (in) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in miles per hour (mph). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.