Hottest (avg)
#11 / 12
On the cooler side.
December in context
How it compares to the rest of the year in Cambridge.
Wettest (avg)
#7 / 12
Typical rainfall for the year.
Daylight Hours
#12 / 12
Shorter days.
Windiest (avg)
#3 / 12
Among the windier months.
Highest UV
#12 / 12
UV is gentler than usual.
Most Humid
#1 / 12
The muggiest month of the year.
Monthly climate breakdown
A detailed look at the typical climate conditions for December.
Thermal profile
Temperature
Typical daytime high
- Nighttime low
-
- Feels like (avg)
-
Light window
Sunshine
7.8 h
Average daylight
- UV index (max)
- 1
- Typical sun hours
- 08:00 - 15:48
Wet-day pattern
Rain & Snow
Typical rainfall
- Rainy days
- 14 days
- Cloud cover (avg)
- 72%
- Snowfall
-
Air feel
Humidity & Wind
87%
Average humidity
- Wind (avg)
-
- Wind (max gusts)
-
Historical daily baseline
Daily climate explorer
Pick a day to inspect the usual conditions through December in Cambridge. Based on a 30-year historical climate baseline, not a forecast.
Primary control
Select a day
Scroll to compare daily conditions. The summary updates with your selection.
Secondary context
Monthly trend
Median daytime highs across the month, with a softer low line.
Median temperatureMedian lowTypical range
Day 15 selected for December. Temperature 7.2°C.
Historical disruption baseline
Typical disruptions in December
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in December.
Cold High impact
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 94% of days (29.1 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
29.1 days / month
- Share of days
- ~94% of days
- Upper edge
- Up to ~4°C (P95)
Why this matters
Cold feels-like nights are possible on ~29 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cold High impact
Freezing nights Measures: Freezing nights (min <=0C). Observed about 23% of days (7.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
7.3 days / month
- Share of days
- ~23% of days
- Upper edge
- Up to ~-0°C (P95)
Why this matters
Freezing nights are possible on ~7 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 19% of days (6.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
6.0 days / month
- Share of days
- ~19% of days
- Upper edge
- Up to ~98km/h (P95)
Why this matters
Strong gusts are possible on ~6 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Visibility High impact
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 16% of days (5.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
5.0 days / month
- Share of days
- ~16% of days
- Upper edge
- Up to ~98% (P95)
Why this matters
Fog-likely conditions are possible on ~5 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 13% of days (3.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
3.9 days / month
- Share of days
- ~13% of days
- Upper edge
- Up to ~15mm (P95)
Why this matters
Washout conditions are possible on ~4 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Severe gusts Measures: Severe gust days (>=80 km/h). Observed about 4% of days (1.1 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.1 days / month
- Share of days
- ~4% of days
- Upper edge
- Up to ~107km/h (P95)
Why this matters
Severe gusts are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Show all disruptions (23 more)
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 0.5 days/month in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- —
- Upper edge
- Up to ~14mm (P95)
Why this matters
Multi-day washout runs are possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 2% of days (0.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.5 days / month
- Share of days
- ~2% of days
- Upper edge
- Up to ~105km/h (P95)
Why this matters
Stormy conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Wind disruption Measures: Disruptive wind days. Observed about 1% of days (0.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.3 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~103km/h (P95)
Why this matters
Disruptive wind is possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain Moderate
Rain disruption Measures: Likely rain disruption days. Observed about 13% of days (4.1 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
4.1 days / month
- Share of days
- ~13% of days
- Upper edge
- Up to ~15mm (P95)
Why this matters
Rain disruption risk appears on ~4 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cold Moderate
Hard freeze nights Measures: Hard freeze nights (min <=-2C). Observed about 11% of days (3.5 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
3.5 days / month
- Share of days
- ~11% of days
- Upper edge
- Up to ~-2°C (P95)
Why this matters
Hard freeze conditions are possible on ~3 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cold Moderate
Cold snap run Measures: Cold snap runs (>=3 cold days). Observed about 2.2 days/month in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.2 days / month
- Share of days
- —
- Upper edge
- Up to ~10°C (P95)
Why this matters
Cold snap runs are possible on ~2 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cold Moderate
Wind chill risk Measures: Wind chill risk days. Observed about 7% of days (2.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
2.2 days / month
- Share of days
- ~7% of days
- Upper edge
- Up to ~-0°C (P95)
Why this matters
Wind chill risk is possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Snow Moderate
Snow days Measures: Snow days (>=0.1mm snowfall). Observed about 6% of days (1.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
1.9 days / month
- Share of days
- ~6% of days
- Upper edge
- Up to ~2.7mm (P95)
Why this matters
Snowfall is possible on ~2 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Moderate
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 3% of days (0.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.9 days / month
- Share of days
- ~3% of days
- Upper edge
- Up to ~19mm (P95)
Why this matters
Heavy rain is possible on ~1 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Daylight Minor
Short daylight Measures: Short daylight days (<=9h). Observed about 100% of days (31.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
31.0 days / month
- Share of days
- ~100% of days
- Upper edge
- Up to ~8.0h (P95)
Why this matters
Short daylight windows are possible on ~31 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 85% of days (26.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
26.3 days / month
- Share of days
- ~85% of days
- Upper edge
- Up to ~96% (P95)
Why this matters
High humidity is possible on ~26 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Cold Minor
Cold days Measures: Cold days (max <=10C). Observed about 72% of days (22.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
22.2 days / month
- Share of days
- ~72% of days
- Upper edge
- Up to ~10°C (P95)
Why this matters
Cold daytime conditions are possible on ~22 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cold Minor
Cold nights Measures: Cold nights (min <=5C). Observed about 71% of days (22.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
22.0 days / month
- Share of days
- ~71% of days
- Upper edge
- Up to ~5°C (P95)
Why this matters
Cold nights are possible on ~22 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 70% of days (21.8 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
21.8 days / month
- Share of days
- ~70% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Cloudy skies are possible on ~22 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 55% of days (17.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
17.0 days / month
- Share of days
- ~55% of days
- Upper edge
- Up to ~10mm (P95)
Why this matters
Measurable rain is possible on ~17 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 55% of days (17.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
17.0 days / month
- Share of days
- ~55% of days
- Upper edge
- Up to ~82km/h (P95)
Why this matters
Gusty conditions are possible on ~17 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 49% of days (15.2 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
15.2 days / month
- Share of days
- ~49% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Mostly cloudy skies are possible on ~15 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 42% of days (13.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
13.0 days / month
- Share of days
- ~42% of days
- Upper edge
- Up to ~15h (P95)
Why this matters
Several rainy hours are possible on ~13 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 25% of days (7.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
7.9 days / month
- Share of days
- ~25% of days
- Upper edge
- Up to ~100% (P95)
Why this matters
Overcast skies are possible on ~8 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 25% of days (7.9 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
7.9 days / month
- Share of days
- ~25% of days
- Upper edge
- Up to ~17h (P95)
Why this matters
Wet-most-of-day conditions are possible on ~8 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 17% of days (5.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
5.3 days / month
- Share of days
- ~17% of days
- Upper edge
- Up to ~35km/h (P95)
Why this matters
Breezy conditions are possible on ~5 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 16% of days (5.0 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
5.0 days / month
- Share of days
- ~16% of days
- Upper edge
- Up to ~98 (P95)
Why this matters
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~5 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Wind Minor
Windy days Measures: Windy days (mean wind >=35 km/h). Observed about 1% of days (0.3 days/month) in December. Historical risk signal only, not a day-by-day forecast.
Likely frequency
0.3 days / month
- Share of days
- ~1% of days
- Upper edge
- Up to ~39km/h (P95)
Why this matters
Strong mean winds are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Travel planning FAQ
Frequently asked questions
Quick answers to the weather questions you ask the most.
Is December a good time to visit Cambridge?
Typical December days in Cambridge reach highs of 8°C (46°F) with nights around 3°C (37°F). It usually feels chilly by day and cold after dark. Overall, December sits in the middle of the Cambridge climate range.
What are temperatures like in December?
In December, you can usually expect highs of 8°C (46°F) and lows near 3°C (37°F). That means chilly days and cold nights, so pack layers you can add or remove.
How much does it rain in December?
Rainfall in December averages 54 mm (2.1 in) across roughly 14 days. Overall it is a very wet time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in December?
You can expect about 8 hours of daylight in December. Sunrise is typically around 08:00 and sunset near 15:48. Daylight is quite limited, and it can feel like a short-day season.
How strong is the sun in December?
UV levels are usually low (around 1), so standard sun protection is enough.
Is it windy in December?
In December, average wind speeds are around 17 km/h (11 mph), with gusts on the windiest days reaching about 70 km/h (43 mph). On the ground, it is it is a notably windy place, and strong gusts are fairly common.