Last updated: June 24, 2025
In December, the average temperature in Northumberland, United States hovers around 2°C (35°F). Expect a chill in the air, as temperatures can dip as low as -16°C (4°F), while occasionally reaching a maximum of 17°C (63°F). During this month, you can anticipate around 88 mm (3.5 in) of precipitation spread over 11 days, contributing to a relatively high average humidity of 85%. Prepare accordingly for a cozy yet damp experience!
In December in Northumberland, the average temperature is 2°C (35°F). The maximum can reach 17°C (63°F), while the minimum can drop as low as -16°C (4°F). Be prepared for a wide range of temperatures if you're planning to visit during this time.
In Northumberland in December, the total precipitation amount is 88 mm (3.5 in) spread over 11 days.
In Northumberland in December humidity is 85%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that permeates your clothing, making travel uncomfortable and requiring extra layers to stay warm and dry.
In Northumberland in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Northumberland, you can visit Hourly UV Index in Northumberland.
UV Risk Categories
Weather in Northumberland varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Northumberland, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 71 mm (2.8 inches) | 87% | moderate |
| February Weather | 1°C (33°F) | 98 mm (3.9 inches) | 85% | moderate |
| March Weather | 4°C (40°F) | 89 mm (3.5 inches) | 85% | high |
| April Weather | 10°C (51°F) | 106 mm (4.2 inches) | 83% | very high |
| May Weather | 16°C (62°F) | 124 mm (4.9 inches) | 75% | very high |
| June Weather | 21°C (70°F) | 89 mm (3.5 inches) | 73% | very high |
| July Weather | 24°C (76°F) | 128 mm (5.0 inches) | 65% | very high |
| August Weather | 23°C (74°F) | 118 mm (4.6 inches) | 62% | very high |
| September Weather | 19°C (67°F) | 115 mm (4.5 inches) | 66% | very high |
| October Weather | 14°C (57°F) | 120 mm (4.7 inches) | 79% | high |
| November Weather | 5°C (42°F) | 94 mm (3.7 inches) | 87% | moderate |
| December Weather | 2°C (35°F) | 88 mm (3.5 inches) | 85% | low |