Hokkaido · Japan · 42.64° N · 141.60° E
Solar position in Tomakomai
Sun position, daylight and the best solar panel angle for Tomakomai — computed for 42.64° N, 141.60° E, 7 m above sea level.
The sun right now
Sun in Tomakomai today
Sunday, 25 October 2026 · local time UTC+9
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 04:23 | sun 18° below horizon |
| Nautical dawn | 04:56 | 12° below |
| Civil dawn | 05:29 | 6° below |
| Sunrise | 05:58 | 106° ESE |
| Golden hour ends | 06:37 | sun 6° up |
| Solar noon | 11:17 | 35.3° high |
| Golden hour starts | 15:57 | sun 6° up |
| Sunset | 16:36 | 254° WSW |
| Civil dusk | 17:05 | 6° below |
| Nautical dusk | 17:38 | 12° below |
| Astronomical dusk | 18:11 | 18° below |
| Day length | 10 h 39 min | |
Sun path diagram for Tomakomai
Where the sun stands in the sky: the centre is straight overhead, the outer ring is the horizon. Numbers mark local clock hours.
- June solstice
- Equinox
- December solstice
- Today
On the June solstice the sun reaches 70.8° at solar noon in Tomakomai; on the December solstice only 24.0°. Sunrise swings from 56° 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.
| Month | Sunrise | Solar noon | Sunset | Day length | Noon elevation |
|---|---|---|---|---|---|
| January | 06:57 | 11:44 | 16:32 | 9 h 34 min | 27.5° |
| February | 06:22 | 11:47 | 17:12 | 10 h 50 min | 36.8° |
| March | 05:36 | 11:41 | 17:46 | 12 h 10 min | 47.6° |
| April | 04:43 | 11:32 | 18:21 | 13 h 38 min | 59.2° |
| May | 04:06 | 11:30 | 18:54 | 14 h 48 min | 67.5° |
| June | 03:55 | 11:35 | 19:14 | 15 h 19 min | 70.8° |
| July | 04:14 | 11:39 | 19:05 | 14 h 51 min | 67.9° |
| August | 04:46 | 11:36 | 18:26 | 13 h 41 min | 59.5° |
| September | 05:19 | 11:26 | 17:33 | 12 h 14 min | 48.1° |
| October | 05:53 | 11:18 | 16:42 | 10 h 49 min | 36.7° |
| November | 06:31 | 11:19 | 16:06 | 9 h 35 min | 27.5° |
| December | 07:00 | 11:31 | 16:02 | 9 h 03 min | 24.0° |
A year of daylight in Tomakomai
Each column is one day of 2026. Bright: sun above the horizon; soft: civil twilight; line: solar noon. Steps are daylight saving time changes.
Best solar panel angle in Tomakomai
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
37°collects the most energy over a year: 1215 kWh per kWp.
67°gives the most in the darkest month — the one an off-grid system is sized for.
- Yearly energy
- Worst-month energy
| Tilt | kWh/kWp per year | Share of best year | December kWh/kWp/day | Best ÷ worst month |
|---|---|---|---|---|
| 0° | 1024 | 84% | 1.05 | 4.1× |
| 15° | 1146 | 94% | 1.46 | 3.0× |
| 30° | 1208 | 99% | 1.81 | 2.4× |
| 37° year-round best | 1215 | 100% | 1.93 | 2.2× |
| 43° = latitude | 1209 | 100% | 2.02 | 2.1× |
| 45° | 1205 | 99% | 2.05 | 2.0× |
| 60° | 1137 | 94% | 2.17 | 1.8× |
| 67° off-grid best | 1085 | 89% | 2.19 | 1.7× |
| 70° | 1059 | 87% | 2.18 | 1.7× |
| 90° | 836 | 69% | 2.04 | 2.0× |
A fixed array in Tomakomai produces the most over a year at 37°. The design month for an off-grid system is December: at 67° it makes 2.19 kWh per kWp a day, 13% more than at 37°, and costs 11% of the yearly total. Why steep panels win winter.
Off-grid solar in Tomakomai at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 37° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 37° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.58 | 2.98 | 2.72 | 2.38 | -3.9 °C |
| February snow | 2.38 | 3.62 | 3.31 | 3.10 | -3.9 °C |
| March snow | 3.55 | 4.12 | 3.72 | 3.95 | -0.6 °C |
| April | 4.60 | 3.88 | 3.43 | 4.31 | 4.4 °C |
| May | 5.11 | 3.50 | 3.02 | 4.23 | 9.7 °C |
| June | 4.98 | 3.13 | 2.64 | 3.86 | 14.4 °C |
| July | 4.52 | 2.98 | 2.47 | 3.51 | 18.4 °C |
| August | 4.25 | 3.26 | 2.70 | 3.54 | 20.3 °C |
| September | 3.76 | 3.71 | 3.12 | 3.63 | 17.6 °C |
| October | 2.76 | 3.59 | 3.09 | 3.20 | 11.6 °C |
| November | 1.70 | 2.76 | 2.43 | 2.30 | 5.0 °C |
| December snow | 1.29 | 2.42 | 2.18 | 1.93 | -1.3 °C |
| Year | 3.38 avg | 3.32 avg | 1059 kWh | 1215 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 540 Wp of panels at 70°, versus 610 Wp at 37°. The steep array is 11% smaller for the same winter. Size your own system.
Row spacing in Tomakomai
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.
5.6 mrow pitch at 70°
4.8 mrow pitch at 37°
How Tomakomai compares in Japan
Against the other 1,215 places in Japan with climate data, for a fixed array at its best angle.
1140thof 1,216 places in Japan for sunshine, shared: 3.38 peak sun hours a day on flat ground.
−5%solar energy a year compared with the average place in Japan: 1,215 against 1,284 kWh per kWp.
+44 mindaylight on the longest day, compared with Tokyo: 15 h 19 min against 14 h 35 min.
37°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); Tomakomai ranks joint 1140th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.18 kWh a day here, against 2.14 kWh on average in Japan. The shortest day lasts 9 h 03 min, −42 min compared with Tokyo.
Solar forecast for Tomakomai, next 48 hours
Expected output of 1 kWp at 70°, computed from the ICON-EU weather model of the Deutscher Wetterdienst (DWD), Europe.
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Questions about the sun in Tomakomai
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Places near Tomakomai
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A free, live card for Tomakomai: where the sun is right now on today's path, a countdown to sunset or sunrise, the daylight change, the moon phase at night and the best panel angle.
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.