Cromwell Weather in December
December in Cromwell averages 17°C (63°F) during the day and 7°C (45°F) at night. It is the wettest month of the year, with 116 mm (4.6 in) of rainfall on average, so waterproof gear is a must.
Rainfall in Cromwell in December
With this being the wettest month, keeping an umbrella on hand might save you from getting wet from a sudden shower. On average, there are about 9 days with rain during this month, averaging 116 mm (4.6 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Cromwell in December
December in Cromwell brings moderate temperatures, with highs of 17°C (63°F) and nights around 7°C (45°F). December is part of the summer season. The difference between afternoon and evening temperatures is usually noticeable. Nights fall to 7°C (45°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Cromwell in December
The month enjoys around 212 hours of sunshine, creating mostly sunny days with good weather conditions.If you prefer enjoying temperate temperatures and rain-free days, February typically offers the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit New Zealand, check out our Cromwell's climate page.
Cromwell Temperature in December
Min Temperature
7°C (45°F)
Max Temperature
17°C (63°F)
Chance of Rain
30%
Precipitation
116 mm (4.6 in)
Rainy days
9 days
Sunshine
212 hours *
Percentage Sunshine
*
Daily Historical Temperatures
31-year average (1995-2025)
Based on our historical records, temperatures in Cromwell typically stay consistent throughout December, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 7°C (45°F) to 9°C (48°F).
Average temperatures in December
Daily Historical Precipitation
31-year average (1995-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Cromwell in December
Browse day-by-day weather records for Cromwell spanning 32 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cromwell historical weather extremes in December
The extremes listed below come from historical weather data collected in Cromwell from 1997 through 2025.
- The hottest December day on record in Cromwell reached 30°C (86°F) (December 25, 2012).
- Cromwell experienced its chilliest December day on December 18, 2004, reaching only 8°C (46°F).
- Cromwell registered its coldest December night on December 21, 2025, with temperatures dropping to -1°C (30°F).
- The wettest day in December Cromwell was on December 28, 2010 with 40 mm (1.6 in) of precipitation.
Best Places in New Zealand in December
Find out more about the weather in New Zealand and which places have the best travel conditions in this month. See all of New Zealand in December →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Cromwell in December
Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Cromwell in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit New Zealand, check out our Cromwell's climate page.
See the full Cromwell climate overview or explore weather in New Zealand.
