Last updated: February 24, 2025
In Greenwich, United States, December ushers in a frosty embrace, with temperatures fluctuating from a chilly minimum of -12°C (11°F) to a pleasant maximum of 17°C (63°F), yielding an average of 3°C (38°F). As the month progresses, residents can expect significant moisture, with 111 mm (4.4 in) of precipitation spread over 11 days, often enhancing the wintry ambiance. Coupled with an average humidity of 80%, the weather creates a crisp and invigorating atmosphere that characterizes the heart of winter in this charming locale.
In December, Greenwich, United States, showcases a compelling transition into winter, marked by a minimum temperature of -12°C (11°F) and an average of 3°C (38°F), hinting at the cold days ahead. With maximum temperatures peaking at 17°C (63°F), this month serves as a bridge between the lingering warmth of autumn and the deep chill of winter. Notably, December's temperatures reveal a steady drop from November's averages, foreshadowing the colder months to come. As the year winds down, residents experience a cozy atmosphere, perfect for enjoying hot beverages and festive gatherings, amidst the crisp air and occasional flurries that characterize the season.
December in Greenwich sees an average precipitation of 111 mm (4.4 in), making it one of the wetter months of the year. Stretching across 11 days, rainfall is relatively consistent, contributing to a cumulative pattern that peaks in the warmer months, particularly in July with 143 mm (5.6 in). While December's totals are slightly lower than those of October and November, which feature 132 mm (5.2 in) and 86 mm (3.4 in) respectively, the overall trend indicates that late fall into winter remains an important period for moisture accumulation. This seasonal transition showcases a gradual decline in precipitation from the summer highs, punctuated by the wintry atmosphere that December brings, creating a dynamic weather pattern that sets the stage for the year ahead.
In December, Greenwich experiences a humidity level of 80%, marking a slight decrease from the preceding November when humidity peaked at 82%. As the year progresses, there's a noticeable trend: humidity levels generally decline from a high of 84% in January to their lowest point of 62% in July. This mid-year dip is followed by gradual increases again in the later months, with October at 74% and November climbing back up to 82%. December's humidity reflects a stabilizing trend amid the seasonal changes, setting the stage for the cooler, wetter months of winter while still remaining relatively high compared to the summer's drier spell. Overall, the month encapsulates the ebb and flow of humidity throughout the year in this picturesque coastal town.
As winter settles in, December in Greenwich, United States, showcases a noticeable decline in UV exposure, with a UV Index of just 2, classifying it as low. This reduction signifies a safer time for outdoor activities, with a burn time extending to 45 minutes before skin damage might occur. This trend of diminishing UV levels contrasts sharply with the intense summer months, where indices peaked at 10, demanding vigilant sun protection. By December, outdoor enthusiasts can relax a bit more, allowing for longer periods in the sun without the urgent need for sunscreen. For a detailed outlook on UV levels throughout the year, visit the Greenwich UV Index.
UV Risk Categories
As December arrives in Greenwich, the landscape transforms, marking the transition into winter with a cozy atmosphere and a touch of holiday magic. With 174 hours of sunshine, the month reflects a gradual decline from the vibrant glow of summer, which boasts an impressive 339 hours in July. Despite this decrease, there’s a notable increase in daylight when compared to the earlier winter months of January and November, which receive only 149 and 207 hours respectively. This trend hints at a slow but uplifting return of daylight as the year progresses, creating a sense of anticipation for the brighter days ahead. Whether it's a brisk walk under a crisp blue sky or a leisurely afternoon basking in the soft sunlight, December in Greenwich offers a refreshing, albeit quieter, celebration of natural beauty.
In December, the likelihood of sunny weather in Greenwich, United States, dips to 31%, reflecting a notable decline as the year comes to a close. This marks one of the lower probabilities for sunshine, alongside February and August, which also experience limited sun exposure. Interestingly, December follows a relatively brighter November with a 55% chance of sunny days, suggesting a significant shift as winter takes hold. Comparatively, the months leading up to December, particularly March with the highest sunshine potential at 56%, illustrate a clear trend of decreasing daylight and warmth as the seasons transition.
As December settles over Greenwich, the daylight duration mirrors the chill in the air, offering just 9 hours of light each day. This marks a continuation of the shorter days experienced in November, as winter tightly grips the landscape. In fact, throughout the year, daylight hours begin at a modest 9 hours in the depths of winter, gradually rising to a peak of 15 hours by June. The narrative of light and dark unfolds with the arrival of spring, where days stretch longer until they begin their gentle retreat again, culminating back at December’s threshold. This rhythmic cycle underscores the seasonal shifts, reminding us of the tranquil beauty found in both the lengthening and shortening of our days.
As the year comes to a close, December in Greenwich, United States, presents a serene yet breezy atmosphere, with an average wind speed of 3.0 m/s (7 mph). This consistent wind pattern marks the tail end of a gradual decline from the warmer months, where the winds were slightly stronger during the spring (peaking at 3.6 m/s in March) and early fall. Throughout the summer, wind speeds dipped to their lowest, averaging around 2.4 m/s in August. However, as autumn settles in, a slight resurgence is noted, with wind speeds stabilizing at 3.0 m/s in November and December. This trend reflects a cooling climate, creating an inviting backdrop for the holiday season, where crisp air and gentle breezes mingle harmoniously.
The weather in Greenwich changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Greenwich and find detailed weather information for every month.
December and January showcase notable differences in weather patterns. In December, temperatures range from a minimum of -12°C (11°F) to a maximum of 17°C (63°F), with an average near 3°C (38°F). The month sees 111 mm (4.4 in) of precipitation over 11 days, accompanied by a humidity level of about 80%. In contrast, January experiences colder temperatures, with a minimum of -18°C (0°F) and a steady average of 0°C (33°F), peaking at 18°C (64°F). Precipitation decreases to 69 mm (2.7 in) over just 8 days, while humidity rises slightly to 84%. For more insights on January weather in Greenwich, check out Greenwich weather in January.
In December, the weather experiences a broader temperature range with a minimum of -12°C (11°F) and a maximum reaching 17°C (63°F), while February sees even colder lows of -16°C (3°F) despite a slightly higher maximum of 20°C (68°F). Both months have similar average temperatures, around 3°C (38°F) for December and 2°C (35°F) for February. Precipitation levels are comparable as well, with December receiving 111 mm (4.4 in) and February a touch less at 101 mm (4.0 in), both spread over 11 days. Interestingly, February is slightly more humid at 82%, compared to December's 80%. For more detailed insights, check out Greenwich weather in February.
In December, temperatures range from a chilly minimum of -12°C (11°F) to a moderate maximum of 17°C (63°F), with an average of 3°C (38°F). The month is characterized by relatively high precipitation at 111 mm (4.4 in) over 11 days, along with a humidity level of 80%. In contrast, March sees slightly warmer conditions, with temperatures ranging from -10°C (15°F) at night to a pleasant maximum of 24°C (76°F) during the day, averaging 5°C (41°F). Precipitation decreases to 93 mm (3.7 in) spread over 10 days, while humidity remains comparable at 81%. For a closer look at the climate during this month, you can visit Greenwich weather in March.
In December, the weather is colder, with temperatures ranging from a brisk -12°C (11°F) to a relatively mild 17°C (63°F), averaging around 3°C (38°F). The month sees about 111 mm (4.4 in) of precipitation over 11 days, coupled with a high humidity level of 80%. In contrast, April brings a gradual warming, with temperatures fluctuating from a minimum of -2°C (30°F) to a maximum of 27°C (81°F), and an average temperature of 10°C (51°F). Though April has slightly more precipitation at 114 mm (4.5 in) over 12 days, the humidity is marginally lower at 78%. For more specific insights about the April weather in Greenwich, you can visit Greenwich weather in April.
December and May present contrasting weather experiences. December is characterized by chilly temperatures, with a minimum of -12°C (11°F) and an average of 3°C (38°F), while the warmth of May offers a much milder average temperature of 16°C (61°F) and highs reaching up to 31°C (89°F). Precipitation levels are relatively similar, with December averaging 111 mm (4.4 in) over 11 days compared to May's 114 mm (4.5 in) across 12 days. However, the humidity in December is notably higher at 80%, compared to a more comfortable 69% in May. This shift in temperature and humidity showcases the transition from the cold winter months to the vibrant warmth of spring. For a closer look at May weather in a specific area, check out Greenwich weather in May.
December and June present starkly contrasting weather patterns. In December, temperatures can drop as low as -12°C (11°F) but typically average around 3°C (38°F), with a maximum reaching 17°C (63°F). The month is marked by high humidity at 80% and substantial precipitation totaling 111 mm (4.4 in) over approximately 11 days. Conversely, June enjoys milder and warmer conditions; minimum temperatures start at 9°C (49°F), averaging 21°C (71°F), and soaring up to a max of 34°C (93°F). Precipitation during June is slightly less, at 91 mm (3.6 in), although it occurs over a marginally longer span of 12 days, with humidity at a lower 69%. For more details on June weather, you can visit Greenwich weather in June.
December and July present stark contrasts in weather. In December, temperatures can plunge to a chilling minimum of -12°C (11°F), with an average of 3°C (38°F) and a maximum reaching only 17°C (63°F). The month sees significant precipitation, totaling 111 mm (4.4 in) over 11 days, accompanied by high humidity at 80%. In contrast, July offers a much warmer climate, with minimum temperatures around 16°C (60°F), an average of 25°C (77°F), and highs soaring to 35°C (96°F). Precipitation in July is slightly higher at 143 mm (5.6 in) over 13 days, but humidity is lower at 62%. For a closer look at the weather patterns, check Greenwich weather in July.
December and August showcase strikingly different weather conditions. While December temperatures can plunge to a minimum of -12°C (11°F) and average around 3°C (38°F), August experiences much milder weather with lows of 15°C (59°F) and an average of 24°C (75°F). Precipitation levels are relatively close, with December receiving 111 mm (4.4 in) over 11 days and August a bit higher at 123 mm (4.8 in) across 14 days. Additionally, December's humidity hovers at a chilly 80%, compared to August's more comfortable 65%. For a more detailed look at August weather, you can check Greenwich weather in August.
In December, temperatures can drop significantly, with a minimum of -12°C (11°F) and an average of 3°C (38°F), while September enjoys milder temperatures, ranging from a minimum of 8°C (47°F) to an average of 20°C (69°F) and peaking at 33°C (91°F). Precipitation is relatively high in both months, with December receiving 111 mm (4.4 in) over 11 days and September slightly less at 98 mm (3.8 in) across 9 days. Additionally, December's humidity is notably higher at 80%, compared to September's more comfortable 68%. For more details on September weather, visit Greenwich weather in September.
In comparing the weather between October and December, October presents generally milder temperatures, with a minimum of 3°C (38°F) and an average of 15°C (60°F), while December experiences much colder conditions, with a minimum reaching -12°C (11°F) and an average of just 3°C (38°F). October is characterized by higher maximum temperatures, peaking at 32°C (90°F), compared to December's maximum of 17°C (63°F). Additionally, October sees slightly higher precipitation at 132 mm (5.2 in) over the same number of rainy days, while December has 111 mm (4.4 in). Furthermore, the humidity is lower in October at 74%, compared to December’s 80%. For more specifics on October weather patterns, check out Greenwich weather in October.
December weather is notably colder than November, with minimum temperatures dropping to -12°C (11°F) compared to November’s -9°C (15°F). While December averages 3°C (38°F), November enjoys a higher average of 8°C (46°F), with maximum temperatures reaching 17°C (63°F) in December and a warmer 23°C (74°F) in November. In terms of precipitation, December sees an increase, with 111 mm (4.4 in) over 11 days, compared to November's 86 mm (3.4 in) over 9 days, and humidity levels remain relatively high at 80% in December versus 82% in November. For more detailed insights on November weather, you can visit Greenwich weather in November.
As December settles in, Greenwich experiences a notable shift in weather compared to other months. The chill in the air becomes palpable, with temperatures often dipping much lower than the milder autumn days, creating a stark contrast with an average that feels far more wintry. Precipitation increases during this time, resulting in more than a week of damp, overcast days, and the committed humidity adds to the frosty atmosphere. Those looking to understand how December fits into the overall climate narrative of Greenwich can explore more details at Greenwich Climate.