Climate Insights for Sullivan

The climate in Sullivan is cool. The average annual temperature is 3°C and approximately 1,042 mm of precipitation falls per year. Sullivan receives a notable amount of rainfall throughout the year, including during its driest month. Sullivan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to -18°C. Sullivan experiences heavy snowfall, typically from January through December.The climate in Sullivan is cool. The average annual temperature is 37°F and approximately 41 in of precipitation falls per year. Sullivan receives a notable amount of rainfall throughout the year, including during its driest month. Sullivan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to 0°F. Sullivan experiences heavy snowfall, typically from January through December.

Sullivan has a wide annual temperature range, spanning 43°C from the coldest to warmest months. July is the warmest month, though highs remain moderate at 25°C with a mean of 19°C. January brings the harshest conditions, with lows dropping to -18°C and an average temperature of -14°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 9°C shift in average temperatures.Sullivan has a wide annual temperature range, spanning 76°F from the coldest to warmest months. July is the warmest month, though highs remain moderate at 76°F with a mean of 66°F. January brings the harshest conditions, with lows dropping to 0°F and an average temperature of 8°F. On average, daily temperatures fluctuate by about 18°F between overnight lows and afternoon highs. The sharpest temperature change occurs between April and May, with a 17°F shift in average temperatures.

Sullivan is a moderately rainy area, receiving approximately 1,042 mm of precipitation annually, which averages out to around 87 mm per month. The wettest month is October, averaging 121 mm of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 53 mm. That's 68 mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Sullivan receives heavy snowfall, accumulating around 315cm annually from January through December. The snowiest month is December, with approximately 63cm. Winter travel should account for significant snow cover.Sullivan is a moderately rainy area, receiving approximately 41 in of precipitation annually, which averages out to around 3.4 in per month. The wettest month is October, averaging 4.8 in of rainfall. July and September also tend to see above-average precipitation. The driest month is January, with just 2.1 in. That's 2.7 in less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Sullivan receives heavy snowfall, accumulating around 124in annually from January through December. The snowiest month is December, with approximately 25in. Winter travel should account for significant snow cover.

Sullivan is mildly breezy, with an average annual wind speed of 12km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.Sullivan is moderately windy, with an average annual wind speed of 7mph. For context, sustained winds below 7mph are generally light, while anything above 16mph is considered strong. The windiest month is November, averaging 8mph, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 7mph, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1mph between the calmest and windiest months.

The best time to visit Sullivan is during August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 99 mm per month. By contrast, July can be uncomfortably hot with highs reaching 25°C, while January is the coldest period with lows dropping to -18°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 Sullivan is during August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 62°F with modest rainfall averaging 3.9 in per month. By contrast, July can be uncomfortably hot with highs reaching 76°F, while January is the coldest period with lows dropping to 0°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 Sullivan 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 Sullivan 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.