Olean, United States — Weather in December 2026

Climate Overview

Olean, United States in December has cold conditions, with highs averaging around 2.4°C (36°F). Rain falls on about 15 days this month, totalling around 85 mm.

This month falls at the beginning of Winter. Cold conditions dominate the month.

Temperatures remain fairly steady throughout December, with daily highs around 3°C (37°F).

December sees fairly even rainfall, totalling about 85 mm across the month.

Expect around 3.8h of sunshine at the start of December, decreasing to 3.3h by the end.

The warmest days tend to fall around the 31th, averaging 3.8°C (39°F).

Compared to November, this month is about 5°C cooler with 2 more rainy days. Temperatures begin dropping heading into January.

Monthly December Averages

Temperature

2°C / -4°C

Feels Like

-2°C / -9°C

Rain

15 days · 85 mm

Sunshine

3.9h / day

Humidity

79% — Humid

Wind

19 km/h

Wind Direction

SW (233°)

Gusts

46 km/h

Daylight

9.2 h

Cloud Cover

84%

Clear Sky Days

0.6

UV Index

1.6 — Low

Dew Point

-4°C — Dry

Moon Phase

Waxing Crescent · 31%

Snow Days

16 days · 27.4 cm

Frost Days

24 days

Climate Charts

Daily averages based on historical data (2016–2025)

Daily Temperature

HighLow

Daily Precipitation

Rainfall

Daily Sunshine

Sunshine

Daily Wind Speed

Wind Speed

Sun Position

Sunrise 07:36

Daylight 9.1h

Sunset 16:44

What to Expect

Cold daytime highs of 2°C (36°F) mean shorter outdoor excursions with warming breaks. Keep afternoons flexible as tropical showers are common — they typically clear within an hour.

Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.

2 of the last 5 yearly records were warmer than this month's long-run average.

Compare Months

Month	Temp	Feels Like	Rain	Sun	Humidity	UV	Status	Details
January	0°C / -7°C	-4°C / -12°C	15days (87 mm) Wet	4.5h Fair	78% Humid	1.9 Low	Poor	View Details
February	3°C / -6°C	-2°C / -11°C	13days (87 mm) Wet	5.8h Fair	75% Muggy	3 Moderate	Poor	View Details
March	7°C / -2°C	4°C / -7°C	13days (90 mm) Wet	7.3h Good	70% Muggy	4.2 Moderate	Poor	View Details
April	13°C / 3°C	11°C / 0°C	15days (114 mm) Wet	8.4h Good	70% Muggy	4.8 Moderate	Poor	View Details
May	19°C / 10°C	18°C / 8°C	15days (112 mm) Wet	9.6h Good	75% Muggy	5.8 High	Good	View Details
June best	24°C / 14°C	24°C / 14°C	13days (103 mm) Wet	11.1h Excellent	75% Muggy	6.7 High	Excellent	View Details
July best	26°C / 17°C	28°C / 18°C	14days (91 mm) Wet	11.3h Excellent	76% Humid	6.9 High	Excellent	View Details
August best	25°C / 17°C	26°C / 17°C	13days (101 mm) Wet	10.4h Excellent	77% Humid	5.9 High	Excellent	View Details
September best	22°C / 13°C	22°C / 13°C	9days (84 mm) Wet	8.8h Good	78% Humid	5 Moderate	Excellent	View Details
October	16°C / 8°C	14°C / 5°C	12days (104 mm) Wet	6.9h Fair	78% Humid	3.4 Moderate	Fair	View Details
November	8°C / 1°C	4°C / -3°C	13days (81 mm) Wet	5.3h Fair	77% Humid	2.2 Moderate	Poor	View Details
December	2°C / -4°C	-2°C / -9°C	15days (85 mm) Wet	3.9h Poor	79% Humid	1.6 Low	Poor	View Details

What to Wear

Full winter gear is a must — insulated coat, thermal base layers, warm hat, gloves, and waterproof boots.

A waterproof jacket or compact umbrella is recommended for occasional showers.

Packing List

Warm coatThermal base layersScarf & glovesUmbrellaWaterproof jacketWaterproof shoes

Frequently Asked Questions

Expand all

Is December a good time to visit Olean?

December is typically poor for visiting Olean, with average highs of 2°C (36°F) and around 15 rainy days. Olean, United States in December has cold conditions, with highs averaging around 2.4°C (36°F). Rain falls on about 15 d

Does it rain a lot in Olean in December?

Olean typically sees around 15 rainy days in December with 85 mm (3.3 in) of total rainfall. Pack a waterproof jacket.

Does it get cold at night in Olean in December?

Yes, nights in Olean during December are cold, averaging -4°C (25°F). Pack warm layers and a coat for evenings.

What should I pack for Olean in December?

With highs of 2°C (36°F) and lows of -4°C (25°F) in December, we recommend: Warm coat, Thermal base layers, Scarf & gloves, Umbrella, Waterproof jacket. Comfortable walking shoes are essential.

Is December among the best months weather-wise in Olean?

December is not the most favourable month weather-wise in Olean. Consider visiting during months with milder temperatures or less rainfall for a better experience.

What is the UV index in Olean in December?

The average UV index in Olean during December is 2 (low). No special sun protection is needed.

How many hours of daylight are there in Olean in December?

Olean gets approximately 9 hours of daylight per day in December, with around 4 hours of sunshine.

Does it snow in Olean in December?

Yes, Olean typically sees around 16 snow days in December with roughly 27 cm (11 in) of snowfall.

Last updated: