Climate averages 1991–2020

Nagahama weather
in December.

A cool, wet month: the 10th warmest and the 3rd driest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 9.1°C Daytime mean, December

Average low 2.9°C Night-time mean, December

Rainfall 111 mm 17 days with ≥1 mm

Daylight 10 h Sunrise to sunset, per day

December is a cool month in Nagahama: daytime highs average 9.1°C and nights cool to about 2.9°C. By daytime temperature it is the 10th warmest of the 12 months.

Expect about 111 mm of rain on roughly 17 days, which makes December a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 49 min on an average December day.

The nearest other city in this atlas is Hikone (15 km away). In December its highs average 9.3°C, about as warm as Nagahama, with 72 mm of rain.

Among the 303 cities listed in Japan, Nagahama ranks joint 232nd of 303 for the warmest December highs and 272nd of 303 for the driest December (rainfall, lowest first). The mean December high of those 303 cities is 9.5°C; Nagahama is 0.4°C cooler than that mean.

From December to January, average highs fall by 2.8°C to 6.3°C, and monthly rainfall rises from 111 mm to 113 mm.

The annual picture

December in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Nagahama climate table

1991–2020

Monthly climate averages for Nagahama, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	6.3°C0.2°C	0.2°C	113	18.1	10.110 h
February	7.1°C-0.1°C	-0.1°C	102	15.2	10.911 h
March	11.2°C2.7°C	2.7°C	144	15.1	11.912 h
April	16.6°C7.5°C	7.5°C	152	13.0	13.113 h
May	21.3°C12.7°C	12.7°C	181	12.5	14.014 h
June	24.8°C17.5°C	17.5°C	228	15.4	14.515 h
July	28.4°C22.1°C	22.1°C	287	18.3	14.314 h
August	29.7°C23.1°C	23.1°C	173	15.7	13.513 h
September	25.8°C19.5°C	19.5°C	222	14.5	12.412 h
October	20.4°C13.7°C	13.7°C	171	12.4	11.311 h
November	14.8°C8.1°C	8.1°C	110	12.8	10.310 h
December, selected	9.1°C2.9°C	2.9°C	111	17.3	9.810 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

December in nearby cities

Distance from Nagahama

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Nagahama) is explained once on the Nagahama year overview and on the Sources, method and limits page.