December Weather in Saint John

Last updated: March 2, 2024

The weather in Saint John, United States, during December is characterized by an average temperature of 1°C (34°F). Highs can soar to 12°C (55°F), while lows may dip to -8°C (18°F). Typically, the humidity level in Saint John throughout December hovers around 86%.

Precipitation and Sunshine hours

In December, Saint John averages 70 mm (2.8 inches) of rainfall, typically over the course of 13 rainy days. The month enjoys an average of 8 hours 33 minutes of daylight, with the sun shining for approximately 4 hours 3 minutes each day. Additionally, there is a 17% probability of sunny days during this period.

UV Index

In December, the UV Index in Saint John reaches a maximum of 2, indicating a level of Low exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 45 minutes.

Monthly weather in Saint John

• Saint John weather January
• Saint John weather February
• Saint John weather March
• Saint John weather April
• Saint John weather May
• Saint John weather June
• Saint John weather July
• Saint John weather August
• Saint John weather September
• Saint John weather October
• Saint John weather November
• Saint John weather December