Last updated: June 24, 2025
In Erin, United States, the average temperature in December hovers around 7°C (46°F), with extremes ranging from a chilly -11°C (13°F) to a toasty 23°C (73°F). Expect 132 mm (5.2 in) of precipitation over about 11 days, contributing to an average humidity of 88%. Whether you're braving the cold or enjoying the mild days, be prepared for a variety of weather conditions!
In December in Erin, the average temperature is 7°C (46°F), with maximums reaching 23°C (73°F) and minimums dropping as low as -11°C (13°F). Pack accordingly to enjoy the diverse weather conditions during your visit.
In Erin in December, the precipitation amount is 132 mm (5.2 in), which occurs over a span of 11 days.
In Erin in December humidity is 88%. With an average temperature of 7°C (46°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and requiring you to dress in layers to stay warm and dry while exploring.
In Erin in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Erin, you can check the information here.
UV Risk Categories
Weather in Erin varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Erin, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 104 mm (4.1 inches) | 86% | moderate |
| February Weather | 7°C (44°F) | 175 mm (6.9 inches) | 84% | high |
| March Weather | 11°C (53°F) | 160 mm (6.3 inches) | 84% | high |
| April Weather | 15°C (59°F) | 162 mm (6.4 inches) | 80% | very high |
| May Weather | 21°C (70°F) | 128 mm (5.1 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 109 mm (4.3 inches) | 83% | extreme |
| July Weather | 27°C (81°F) | 115 mm (4.5 inches) | 79% | extreme |
| August Weather | 26°C (78°F) | 117 mm (4.6 inches) | 76% | very high |
| September Weather | 23°C (74°F) | 112 mm (4.4 inches) | 75% | very high |
| October Weather | 17°C (63°F) | 128 mm (5.0 inches) | 74% | high |
| November Weather | 9°C (49°F) | 92 mm (3.6 inches) | 85% | moderate |
| December Weather | 7°C (46°F) | 132 mm (5.2 inches) | 88% | moderate |