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December is a poor month in Olean

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.

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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

8°C 5°C 2°C -1°C -4°C -7°C -10°C 151015202531
HighLow

Daily Precipitation

0 mm 2 mm 4 mm 6 mm 151015202531
Rainfall

Daily Sunshine

0h 2h 4h 6h 8h 151015202531
Sunshine

Daily Wind Speed

0 6 12 18 24 30 151015202531
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

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

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
Olean typically sees around 15 rainy days in December with 85 mm (3.3 in) of total rainfall. Pack a waterproof jacket.
Yes, nights in Olean during December are cold, averaging -4°C (25°F). Pack warm layers and a coat for evenings.
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.
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.
The average UV index in Olean during December is 2 (low). No special sun protection is needed.
Olean gets approximately 9 hours of daylight per day in December, with around 4 hours of sunshine.
Yes, Olean typically sees around 16 snow days in December with roughly 27 cm (11 in) of snowfall.

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