Mount Takao in December: weather, what to wear and what's on

Averages for 1991–2020 at the JMA's Hachioji station (123 m above sea level).

High

11.7°C (53°F)

Low

0.8°C (33°F)

Precipitation

53.1 mm

Wet days

4.9 days

Sunshine

184 hours

• Highs fall 4.7°C from November and drop another 2.4°C into January.
• That is 8.3°C below Hachioji's yearly average high of 20.0°C.
• Of our 34 places with temperature records, Hachioji is the 17th warmest in December: level with Nagoya and 0.1°C warmer than Kyoto.
• December is Hachioji's 2nd driest month (53.1 mm).
• Of our 35 places, Hachioji has the 7th lowest precipitation in December: 0.2 mm less than Tokyo Disney Resort and 3.3 mm more than Kawaguchiko.
• Rain or snow of 1 mm or more falls on 4.9 days, and 10 mm or more on 1.8 days.
• The temperature drops below 0°C on 13.6 nights.
• The sun is out for 40% or more of the possible hours on 22.7 days, and 3.4 days have under 0.1 hours of sunshine.

Average temperature

5.9°C (43°F)

Early, mid and late December

By the last ten days of December the average high in Hachioji is 2.3°C lower than in the first ten.

By ten-day totals, 1–10 December is the wettest (20.8 mm) and 11–20 December the driest (13.8 mm).

Is Mount Takao cold in December?

Yes, it is chilly. Hachioji averages 11.7°C (53°F) by day and 0.8°C (33°F) at night in December. It gets colder still: 11–20 January has highs of 9.0°C.

Chilly: highs around 11.7°C

This is for Hachioji (123 m above sea level).

• A warm jacket or light coat over a sweater.
• Gloves and a hat for mornings and nights: the temperature drops below 0°C on 13.6 nights.
• Layers you can take off: afternoons are 10.9°C warmer than early mornings on average.
• Rain or snow is less common (on 4.9 days); a compact umbrella is enough.

Pack

• Compact umbrella
• Gloves and a warm hat

• Our clothing rules

There are no national holidays in December 2026.

In December 2025, hotels and inns across Tokyo were 78.2% full on average (4th busiest of 12 months). Foreign guests spent 5.57 million nights there that month (Japan Tourism Agency). That compares with 79.8% in November and 71.1% in January.

• Japan in December: visitor numbers and busy travel days
• Holidays in December
• Year-end and New Year holidays