Japan

Nagano in December: weather & travel advice

This month's data profile

Rain shapes the decision

Nagano in December is climatically mixed. The average daily high is around 4 °C. With about 20 rainy days it is very wet.

Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.

Rank among 12 monthly averages

18/100 · #11

Warmth

#10

Dryness

#11

Sun

#12

Published best categories: none

Nagano · DecemberPhoto: Sl-Ziga · CC BY-SA 3.0

Average high: 4 °C
Average low: -4 °C
Rainy days (est.): 20 rainy days (est.)
Sun (est.): 3 h/day
Humidity: 88 %

Climate evidence with direct month comparison

The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.

Climate averages for Nagano: selected and adjacent months
Month	Avg high °C	Avg low °C	Rainy days (est.)	Precipitation mm	Sun h/day (est.)	Humidity %	Wind m/s	Score
November	11	1	15	96	3.2	85	1.7	33
December (selected)	4	-4	20	94	2.7	88	2.1	18
January	0	-8	19	90	2.9	89	2.4	17

How do the previous and next months compare?

Baseline: December (18/100)

Positive and negative values show the change from the selected month.

	Score Δ	Average high Δ	Average low Δ	Rainy days Δ	Rain Δ	Sun Δ	Humidity Δ	Wind Δ
November	+15	+7.1 °C	+5.2 °C	-4.6	+1.5 mm	+0.5 h	-2.5 %	-0.4 m/s
January	-1	-3.6 °C	-3.8 °C	-0.4	-3.7 mm	+0.2 h	+1.7 %	+0.3 m/s

All twelve months in context

JanUnsuitable17 FebUnsuitable25 MarUnsuitable33 AprLimited52 MayGood69 JunGood67 JulLimited58 AugLimited57 SepGood65 OctLimited53 NovUnsuitable33 DecUnsuitable18

Rainy days (estimated)

Sunshine hours (estimated)h/day

Average daily high°C

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Useful next decisions

Nagano · Month by month

Seoul · December New York · December Lake Tahoe · December Takayama · December

Frequently asked questions

How warm is Nagano in December?

The average daily high is around 4 °C, with an average daily low of about -4 °C.

Does it rain a lot in Nagano in December?

The curated estimate is about 20 rainy days per month, not a directly measured long-term average. Total precipitation averages around 94 mm for the month. A rainy day does not mean all-day rain.

When is the best time to visit Nagano?

By the climate score, May, June and September are the strongest months for Nagano. December is not among them.