Weather in Sidney in December 2025
- December is usually the wettest month of the year in Sidney;
Average weather
Average temperature in Sidney in December
The temperature in December is +41°F on average, with a range between a maximum of +59°F during the day and a minimum of +9°F at night.
The average maximum temperature goes down 7% by the end of the month, compared with the beginning of the month, from +39°F to +36°F.
Is Sidney warm or cold in December?
Sidney is typically cold in December.
Maximum temperatures go down compared to the previous month from +41°F to +28°F. The minimum temperature also goes down from +23°F to +12°F.
Wear your winter warms as it will be cold. To save space, layer, and don’t forget gloves and a scarf.
December is one of the coolest months in Sidney, here is the comparison with other months:
Climate in Sidney in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +41°F | +28°F | +27°F | ||||
| Min. temperature | ||||||
| -22°F | -38°F | -36°F | ||||
| Max. temperature | ||||||
| +77°F | +64°F | +59°F | ||||
| Rainfall | ||||||
| 6 mm | 2 mm | 1 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 3 m/s | ||||
| Humidity | ||||||
| 72% | 75% | 75% | ||||
| Air pressure | ||||||
| 1016 HPa | 1018 HPa | 1019 HPa | ||||
| Sunny days | ||||||
| 7 | 7 | 6 | ||||
| Cloudy days | ||||||
| 14 | 15 | 16 | ||||
| Rainy days | ||||||
| 3 | 1 | 1 | ||||
| Snowy days | ||||||
| 6 | 9 | 8 | ||||
December typically has worse weather conditions compared to November. It’s getting colder in December. From +41°F in the day, the average maximum temperature lowers to +28°F. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 6 mm to 2 mm. Humidity rises from 72% to 75%. The average wind speed doesn’t change much during December, staying around 3 m/s. The amount of sunny days stay about the same, averaging 7 sunny days during the month.
January brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 10 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Sidney is gradually increasing during December, going from 1 m/s to 2 m/s over the course of the month.
Rain
Snow
December is one of the snowiest months in Sidney.
Here’s how December is compared with other months in the amount of snow, total mm:
How was the weather last December in Sidney?
Climate Change Over the Years
The climate in Sidney in December has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+51°F) and the highest in 2021 (+61°F). The driest year was 1984 with only 161 mm of rainfall, and the wettest year was 2019 with 602 mm.
FAQ
Is December a good time to visit Sidney?
Can you sunbathe in Sidney in December?
Is Sidney rainy in December?
Is it sunny in Sidney in December?
Other cities in USA
Monthly weather in Sidney
Source of the data
For this page, we’ve looked at the typical weather in Sidney, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
