Solarposition.org

Hokkaido · Japan · 42.25° N · 140.27° E

Solar position in Yakumo

Sun position, daylight and the best solar panel angle for Yakumo — computed for 42.25° N, 140.27° E, 9 m above sea level.

Sunrise today06:02106° ESE
Sunset today16:42254° WSW
Best panel angle33°year-round, facing south
Off-grid angle62°best for the darkest month

The sun right now

Azimuth180.0°
Elevation35.7°
At solar noon, 11:22Open on the sun map

Sun in Yakumo today

Sunday, 25 October 2026 · local time UTC+9

EventTimeDirection / height
Astronomical dawn04:28sun 18° below horizon
Nautical dawn05:0112° below
Civil dawn05:346° below
Sunrise06:02106° ESE
Golden hour ends06:41sun 6° up
Solar noon11:2235.7° high
Golden hour starts16:03sun 6° up
Sunset16:42254° WSW
Civil dusk17:116° below
Nautical dusk17:4412° below
Astronomical dusk18:1618° below
Day length10 h 40 min

Sun path diagram for Yakumo

Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.

15°30°45°60°75°N30°60°E120°150°S210°240°W300°330°June solstice5678910111213141516171819EquinoxDecember solstice8910111213141516Today
  • June solstice
  • Equinox
  • December solstice
  • Today

On the June solstice the sun reaches 71.2° at solar noon in Yakumo; on the December solstice only 24.3°. Sunrise swings from 57° ENE in June to 122° ESE in December — a 65° arc along the horizon.

Sunrise, sunset and sun height by month

Values for the 21st of each month, local clock time including daylight saving time.

MonthSunriseSolar noonSunsetDay lengthNoon elevation
January07:0211:5016:389 h 36 min27.9°
February06:2711:5217:1810 h 51 min37.2°
March05:4111:4617:5112 h 10 min48.0°
April04:4911:3718:2613 h 37 min59.6°
May04:1211:3518:5814 h 46 min67.9°
June04:0211:4019:1815 h 16 min71.2°
July04:2011:4519:0914 h 49 min68.2°
August04:5211:4218:3113 h 39 min59.9°
September05:2411:3117:3812 h 14 min48.5°
October05:5811:2316:4810 h 50 min37.1°
November06:3611:2416:129 h 37 min27.9°
December07:0411:3616:099 h 05 min24.3°

A year of daylight in Yakumo

Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.

00:0003:0006:0009:0012:0015:0018:0021:0000:00JanFebMarAprMayJunJulAugSepOctNovDec

Best solar panel angle in Yakumo

Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.

33°collects the most energy over a year: 1124 kWh per kWp.

62°gives the most in the darkest month — the one an off-grid system is sized for.

50%60%70%80%90%100%0°10°20°30°40°50°60°70°80°90°Best year-round 33°Best worst-month 62°70°Yearly energyWorst-month energy
  • Yearly energy
  • Worst-month energy
TiltkWh/kWp per yearShare of best yearDecember kWh/kWp/dayBest ÷ worst month
0°98087%0.874.9×
15°108196%1.173.8×
30°1123100%1.403.1×
33° year-round best1124100%1.443.0×
42° = latitude111399%1.532.7×
45°110598%1.552.6×
60°102791%1.612.3×
62° off-grid best101290%1.612.2×
70°94584%1.592.1×
90°72364%1.441.7×

A fixed array in Yakumo produces the most over a year at 33°. The design month for an off-grid system is December: at 62° it makes 1.61 kWh per kWp a day, 12% more than at 33°, and costs 10% of the yearly total. Why steep panels win winter.

Off-grid solar in Yakumo at 70°

Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 33° (year-round best).

012345January: 1.86 (70°)1.9JanFebruary: 2.36 (70°)2.4FebMarch: 3.07 (70°)3.1MarApril: 3.31 (70°)3.3AprMay: 2.97 (70°)3.0MayJune: 2.61 (70°)2.6JunJuly: 2.42 (70°)2.4JulAugust: 2.71 (70°)2.7AugSeptember: 3.11 (70°)3.1SepOctober: 2.98 (70°)3.0OctNovember: 2.07 (70°)2.1NovDecember: 1.59 (70°)1.6Dec33°
MonthSun hours, flatSun hours at 70°kWh/kWp/day at 70°at 33°Mean temp.
January snow1.282.081.861.67-1.5 °C
February snow1.972.622.362.30-1.4 °C
March3.263.443.073.421.6 °C
April4.503.763.314.196.1 °C
May5.073.462.974.2410.8 °C
June4.983.112.613.9315.5 °C
July4.472.932.423.5119.5 °C
August4.323.292.713.6121.8 °C
September3.803.723.113.6319.1 °C
October2.743.482.983.0613.3 °C
November1.552.362.071.946.6 °C
December1.091.791.591.440.6 °C
Year3.26 avg3.00 avg945 kWh1124 kWh

Sizing example. To run a 1 kWh-per-day load through December on LiFePO4 batteries (charge controller, battery and inverter losses included) you need about 740 Wp of panels at 70°, versus 820 Wp at 33°. The steep array is 10% smaller for the same winter. Size your own system.

Row spacing in Yakumo

Distance between rows of 2 m long panels (slope length) so that no row shades the next between 10:00 and 14:00 solar time on the winter solstice.

5.5 mrow pitch at 70°

4.5 mrow pitch at 33°

Row spacing calculator

How Yakumo compares in Japan

Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.

1201stof 1,216 places in Japan for sunshine, shared: 3.26 peak sun hours a day on flat ground.

−12%solar energy a year compared with the average place in Japan: 1,124 against 1,284 kWh per kWp.

+42 mindaylight on the longest day, compared with Tokyo: 15 h 16 min against 14 h 35 min.

33°best year-round tilt here; across Japan it runs from 17° in Miyakojima to 41° in Kushiro.

Of the 1,216 places in Japan, Miyakojima gets the most sun (4.34 peak sun hours a day) and Wakkanai and one other place the least (3.17); Yakumo ranks joint 1201st. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 1.59 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 05 min, −39 min compared with Tokyo.

The sunniest places in Japan

Solar forecast for Yakumo, next 48 hours

Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.

Loading the latest forecast…

Questions about the sun in Yakumo

What is the best solar panel angle in Yakumo?
For a fixed array facing south, the best year-round tilt in Yakumo is 33°, worth about 1124 kWh per kWp a year. An off-grid system that has to get through December does better at about 62°.
What time is sunrise and sunset in Yakumo today?
On 25 October 2026 the sun rises at 06:02 and sets at 16:42 local time (UTC+9), giving 10 h 40 min of daylight. Solar noon is at 11:22.
How many peak sun hours does Yakumo get?
On a flat surface 3.3 hours a day averaged over the year, from 1.1 in December to 5.1 in May. Panels tilted at 70° receive 1.8 sun hours a day in December.
How high does the sun get in Yakumo?
At solar noon the sun stands 71.2° above the horizon on the June solstice and 24.3° on the December solstice.
Is Yakumo a good place for solar panels?
With 3.3 peak sun hours a day on flat ground, Yakumo ranks joint 1201st of 1,216 places in Japan for sunshine. A 1 kWp array at the best angle (33°) makes about 1,124 kWh a year here, 12% less than the average place in Japan.

Places near Yakumo

All places in Japan

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Sun positions: NREL Solar Position Algorithm. Climate: NASA POWER monthly climatology (NASA Langley Research Center). Forecast: Deutscher Wetterdienst, ICON-EU (CC BY 4.0), processed. Places: GeoNames (CC BY 4.0). Time zones: IANA. Sources and licences.