Ishikari weather in December

In December, Ishikari sees average daytime highs of 1°C and overnight lows near -3°C, with 104 mm of precipitation across 20.3 wet days and about 8.9 hours of daylight. It is the 10th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 3°C in the first days to -1°C by the end. The sky is clear or mostly clear about 6% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 hours at the start of December to 8 h 48 min by month's end. Set against the rest of the year, December is Ishikari's 11th-clearest and 1st-windiest month. For the whole year in context, see Ishikari's year-round climate.

Daytime high
10th warmest
Overnight low
-3°
3rd coldest
Precipitation
104 mm
20.3 wet days
Daylight
8 h 48 min
7:06 AM – 3:55 PM
Cloud cover
70%
11th clearest
Wind
18 km/h
1st windiest
Solar energy
1.48 kWh/m²
Travel score
0.0
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 3°C in the first days to -1°C by the end.

A typical December day in Ishikari reaches about 1°C in the afternoon and slips back to -3°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between -3°C and 5°C. Set against its neighbours, December runs about 7°C cooler than November and about 3°C warmer than January.

-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
140
23-1
33-1
43-1
53-1
62-1
72-1
82-2
92-2
102-2
111-2
121-2
131-2
141-3
151-3
161-3
171-3
181-3
190-3
200-3
210-3
220-4
230-4
240-4
250-4
260-4
270-4
280-4
290-4
30-1-4
31-1-4

How December really feels in Ishikari

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 31 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
31
5 feel bitter (≤ -10°C)

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

Ishikari weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -6°8019.222.59.20.0
Feb-1° / -6°6416.118.410.20.0
Mar / -3°6212.51211.60.0
Apr / 6310.92.613.21.6
May14° / 83110.114.54.0
Jun18° / 13°7410.1015.15.7
Jul22° / 18°12712.2014.96.2
Aug24° / 19°16713.2013.86.3
Sep21° / 16°13913.4012.35.9
Oct15° / 10°10113.90.210.84.2
Nov / 11117.77.49.51.0
Dec / -3°10420.320.48.90.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 25% of December, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13367
23268
33367
43367
53367
63367
73466
83466
93466
103466
113466
123466
133466
143466
153466
163367
173367
183268
193268
203169
213169
223070
233070
243070
252971
262971
272971
282872
292872
302872
312872

Chance of precipitation in December

Any precipitationSnow

Ishikari gets around 104 mm of rain and snow over 20.3 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 65% and peaks near 66% on the wettest days, and about 20 days bring snow.

0%20%40%60%80%151015202531
Rain chance (%)Snow chance (%)
16249
26251
36253
46355
56356
66458
76459
86460
96561
106563
116663
126664
136665
146665
156666
166666
176666
186667
196668
206668
216669
226670
236670
246671
256671
266672
276672
286673
296673
306674
316674

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 18 km/h in December, the windiest month of the year.

Across December, daily wind ranges from about 18 km/h on the calmest days to 19 km/h at its breeziest. It stays fairly steady from day to day.

0510152025151015202531
Wind speed (km/h)Feels
119light breeze
219light breeze
319light breeze
419light breeze
519light breeze
619light breeze
719light breeze
819light breeze
919light breeze
1019light breeze
1119light breeze
1219light breeze
1319light breeze
1418light breeze
1518light breeze
1618light breeze
1718light breeze
1818light breeze
1918light breeze
2018light breeze
2118light breeze
2218light breeze
2318light breeze
2418light breeze
2518light breeze
2618light breeze
2718light breeze
2818light breeze
2918light breeze
3018light breeze
3118light breeze

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 hours at the start of December to 8 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 6:53 AM to 7:13 AM, and sunset from 3:55 PM to 4:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.06:533:55
29.06:543:55
39.06:553:55
49.06:563:55
59.06:573:54
68.96:583:54
78.96:593:54
88.97:003:54
98.97:013:54
108.97:023:54
118.97:033:54
128.87:033:54
138.87:043:54
148.87:053:55
158.87:063:55
168.87:063:55
178.87:073:55
188.87:083:56
198.87:083:56
208.87:093:56
218.87:093:57
228.87:103:57
238.87:103:58
248.87:113:58
258.87:113:59
268.87:113:59
278.87:124:00
288.87:124:01
298.87:124:01
308.87:124:02
318.87:134:03

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.48 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.48 kWh/m² to a high of 5.5 kWh/m² in May across the year — December's 1.48 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.5Dim
21.5Dim
31.5Dim
41.5Dim
51.5Dim
61.5Dim
71.5Dim
81.5Dim
91.5Dim
101.5Dim
111.5Dim
121.5Dim
131.5Dim
141.5Dim
151.5Dim
161.5Dim
171.5Dim
181.5Dim
191.5Dim
201.5Dim
211.5Dim
221.5Dim
231.5Dim
241.5Dim
251.6Dim
261.6Dim
271.6Dim
281.6Dim
291.6Dim
301.6Dim
311.6Dim
Planning a trip in December

Hazard calendar for Ishikari

In seasonPeak

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

Ishikari 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 Ishikari?

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

0.0
Sightseeing
9th-best month of the year
0.0
Beach & pool
7th-best month of the year

December is a weaker month for outdoor sightseeing in Ishikari.

What to pack for Ishikari in December

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

In December, Ishikari sees daytime highs around 1°C and nights near -3°C. Pack a warm layer, a heavy coat and rain gear. About 20 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Ishikari in December

The nearest coast averages about 9°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 15 km away) is warmest in August at about 22°C and coldest in February near 5°C.

It's comfortable for a long swim from Jul 31 to Sep 22 — about 1.8 months when the water holds above 20°C.

10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan7Bracing
Feb5Bracing
Mar5Bracing
Apr7Bracing
May10Bracing
Jun14Bracing
Jul19Cool
Aug22Refreshing
Sep21Refreshing
Oct17Cool
Nov13Bracing
Dec9Bracing

UV index in Ishikari in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ishikari peaks around August 18 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighHighVery highHighModerateLowAug 18UV 8Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr5High
May7Very high
Jun7High
Jul5Moderate
Aug8Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Ishikari 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 Ishikari is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (December, 9 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodApr 1121 µg/m³Dec 169 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb15Moderate
Mar21Moderate
Apr21Moderate
May19Moderate
Jun13Moderate
Jul12Moderate
Aug11Good
Sep10Good
Oct12Good
Nov11Good
Dec9Good
Location & terrain

Where is Ishikari?

Ishikari sits at 43.2°N, 141.4°E, 0 m above sea level, in Japan. The nearest listed city is Tōbetsu, 13 km away.

Topography around Ishikari

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

Within 3 km, the terrain around Ishikari has only modest variations in elevation — a maximum elevation change of 14 m around an average of 3 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 414 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,859 m.

The land around Ishikari is covered by water (43%) and cropland (26%) within 3 km, water (45%) and cropland (20%) within 16 km, and trees (57%) and water (26%) within 80 km.

3 km
14 m
16 km
414 m
80 km
1,859 m
treesgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Tōbetsu 13 km · Sapporo 19 km · Ebetsu 22 km · Otaru 29 km · Iwamizawa 33 km · Kitahiroshima 34 km · Bibai 42 km · Eniwa 43 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 Ishikari (43.2397°, 141.3539°, elevation 0 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).