Hekinan weather in December

In December, Hekinan sees average daytime highs of 12°C and overnight lows near 4°C, with 56 mm of rain across 5.6 wet days and about 9.7 hours of daylight. It is the 10th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 10°C by the end. The sky is clear or mostly clear about 61% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 48 min at the start of December to 9 h 42 min by month's end. Set against the rest of the year, December is Hekinan's 1st-clearest and 5th-windiest month. For the whole year in context, see Hekinan's year-round climate.

Daytime high
12°
10th warmest
Overnight low
3rd coldest
Rainfall
56 mm
5.6 wet days
Daylight
9 h 42 min
6:58 AM – 4:38 PM
Cloud cover
39%
1st clearest
Wind
13 km/h
5th windiest
Solar energy
2.57 kWh/m²
Travel score
3.7
out of 10

Hekinan is city in Aichi prefecture, Japan.

Density
2,021/km²
people per km²
Founded
1948

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 14°C in the first days to 10°C by the end.

A typical December day in Hekinan reaches about 12°C in the afternoon and slips back to 4°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 15°C. Set against its neighbours, December runs about 5°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1146
2146
3146
4146
5146
6135
7135
8135
9135
10135
11135
12124
13124
14124
15124
16124
17124
18124
19114
20113
21113
22113
23113
24113
25113
26113
27113
28113
29113
30103
31102

How December really feels in Hekinan

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 11 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
11
wind chill below the day's low

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Hekinan weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan10° / 545.79.92.4
Feb11° / 616.310.72.8
Mar14° / 1089.611.74.3
Apr19° / 10°1169.912.96.1
May24° / 15°13810.313.86.7
Jun27° / 20°17813.414.35.7
Jul30° / 24°18614.714.14.3
Aug32° / 25°11012.413.33.9
Sep28° / 21°19312.212.25.4
Oct23° / 15°17910.511.16.8
Nov17° / 847.210.26.0
Dec12° / 565.69.73.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 61% of the time in December, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 27%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16733
26733
36832
46832
56832
66931
76931
87030
97030
107129
117228
127228
137228
147228
157228
167327
177426
187426
197426
207525
217525
227624
237624
247723
257723
267822
277822
287822
297921
307921
317822

Chance of precipitation in December

Any precipitation

Hekinan gets around 56 mm of rain over 5.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 18% and peaks near 21% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
121
221
320
420
520
619
719
819
918
1018
1118
1217
1317
1417
1517
1617
1717
1817
1917
2017
2117
2217
2317
2417
2517
2617
2717
2817
2916
3016
3116

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19721
29811
39811
49910
59910
69910
79910
89910
99910
109910
119910
129910
139910
1410000
1510000
1610000
1710000
1810000
1910000
2010000
2110000
2210000
2310000
2410000
2510000
2610000
2710000
2810000
2910000
3010000
3110000

Wind in December

Winds average 13 km/h in December.

Across December, daily wind ranges from about 12 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 48 min at the start of December to 9 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 6:47 AM to 7:05 AM, and sunset from 4:37 PM to 4:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.86:474:37
29.86:484:37
39.86:494:36
49.86:504:36
59.86:504:36
69.86:514:36
79.76:524:37
89.76:534:37
99.76:534:37
109.76:544:37
119.76:554:37
129.76:564:37
139.76:564:37
149.76:574:38
159.76:584:38
169.76:584:38
179.76:594:39
189.76:594:39
199.77:004:39
209.77:004:40
219.77:014:40
229.77:014:41
239.77:024:41
249.77:024:42
259.77:034:42
269.77:034:43
279.77:034:43
289.77:044:44
299.77:044:45
309.77:044:45
319.77:054:46

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.57 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.57 kWh/m² to a high of 5.54 kWh/m² in May across the year — December's 2.57 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.6Moderate
22.6Moderate
32.6Moderate
42.6Moderate
52.5Moderate
62.5Moderate
72.5Moderate
82.5Moderate
92.5Moderate
102.5Moderate
112.5Moderate
122.5Moderate
132.5Moderate
142.6Moderate
152.6Moderate
162.6Moderate
172.6Moderate
182.6Moderate
192.6Moderate
202.6Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.7Moderate
252.7Moderate
262.7Moderate
272.7Moderate
282.7Moderate
292.7Moderate
302.8Moderate
312.8Moderate
Planning a trip in December

Hazard calendar for Hekinan

In seasonPeak

In December, Hekinan sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Hekinan sits in the Pacific typhoon belt; the season peaks July–October.

Pacific typhoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Hekinan?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.7
Sightseeing
10th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Hekinan.

What to pack for Hekinan in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Hekinan sees daytime highs around 12°C and nights near 4°C. Worth packing: a warm layer. About 6 days see rain.

a warm layer

Sea temperature near Hekinan in December

The nearest coast averages about 17°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 27°C and coldest in February near 13°C.

It's comfortable for a long swim from May 31 to Nov 9 — about 5.4 months when the water holds above 20°C.

10°15°20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan14Bracing
Feb13Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug27Warm
Sep26Warm
Oct22Refreshing
Nov19Cool
Dec17Cool

UV index in Hekinan in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hekinan peaks around July 10 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 10UV 10Dec 22UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May8Very high
Jun10Very high
Jul10Very high
Aug8Very high
Sep9Very high
Oct6High
Nov4Moderate
Dec2Moderate

Air quality in Hekinan in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Hekinan is worst in April — around 22 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (December, 13 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1322 µg/m³Dec 1813 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb17Moderate
Mar21Moderate
Apr22Moderate
May21Moderate
Jun19Moderate
Jul15Moderate
Aug14Moderate
Sep14Moderate
Oct15Moderate
Nov15Moderate
Dec13Moderate
Location & terrain

Where is Hekinan?

Hekinan sits at 34.9°N, 137.0°E, 3 m above sea level, in Japan. The nearest listed city is Takahama, 4.0 km away.

Topography around Hekinan

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hekinan.

Within 3 km, the terrain around Hekinan has only modest variations in elevation — a maximum elevation change of 23 m around an average of 4 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 294 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,696 m.

The land around Hekinan is covered by artificial surfaces (62%) and water (23%) within 3 km, artificial surfaces (37%), cropland (21%) and water (21%) within 16 km, and trees (47%) and water (28%) within 80 km.

3 km
23 m
16 km
294 m
80 km
1,696 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Takahama 4.0 km · Handa 5.0 km · Nishio 6.0 km · Taketoyo 7.0 km · Agui 9.0 km · Ogawa 9.0 km · Ishiki 10 km · Kariya 11 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hekinan (34.8833°, 136.9833°, elevation 3 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).