Illinois · United States · 41.71° N · 87.76° W
Solar position in Oak Lawn
Sun position, daylight and the best solar panel angle for Oak Lawn — computed for 41.71° N, 87.76° W, 182 m above sea level.
The sun right now
Sun in Oak Lawn today
Saturday, 24 October 2026 · local time UTC−5
| Event | Time | Direction / height |
|---|---|---|
| Astronomical dawn | 05:40 | sun 18° below horizon |
| Nautical dawn | 06:12 | 12° below |
| Civil dawn | 06:45 | 6° below |
| Sunrise | 07:13 | 105° ESE |
| Golden hour ends | 07:52 | sun 6° up |
| Solar noon | 12:34 | 36.4° high |
| Golden hour starts | 17:17 | sun 6° up |
| Sunset | 17:56 | 255° WSW |
| Civil dusk | 18:24 | 6° below |
| Nautical dusk | 18:56 | 12° below |
| Astronomical dusk | 19:29 | 18° below |
| Day length | 10 h 42 min | |
Sun path diagram for Oak Lawn
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 71.7° at solar noon in Oak Lawn; on the December solstice only 24.9°. Sunrise swings from 57° ENE in June to 121° ESE in December — a 64° 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 | 07:12 | 12:02 | 16:52 | 9 h 41 min | 28.5° |
| February | 06:37 | 12:04 | 17:31 | 10 h 54 min | 37.9° |
| March | 06:52 | 12:58 | 19:04 | 12 h 12 min | 48.8° |
| April | 06:01 | 12:49 | 19:38 | 13 h 37 min | 60.3° |
| May | 05:25 | 12:47 | 20:09 | 14 h 44 min | 68.6° |
| June | 05:16 | 12:52 | 20:29 | 15 h 13 min | 71.7° |
| July | 05:34 | 12:57 | 20:19 | 14 h 45 min | 68.7° |
| August | 06:05 | 12:53 | 19:41 | 13 h 36 min | 60.2° |
| September | 06:37 | 12:43 | 18:49 | 12 h 12 min | 48.8° |
| October | 07:10 | 12:35 | 18:00 | 10 h 50 min | 37.4° |
| November | 06:47 | 11:36 | 16:25 | 9 h 38 min | 28.3° |
| December | 07:14 | 11:49 | 16:23 | 9 h 09 min | 24.9° |
A year of daylight in Oak Lawn
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 Oak Lawn
Fixed array facing south (azimuth 180°). Energy per kWp from NASA POWER monthly climate, including clouds, temperature and snow reflection.
35°collects the most energy over a year: 1352 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° | 1149 | 85% | 1.13 | 4.4× |
| 15° | 1284 | 95% | 1.61 | 3.1× |
| 30° | 1348 | 100% | 2.00 | 2.4× |
| 35° year-round best | 1352 | 100% | 2.11 | 2.2× |
| 42° = latitude | 1344 | 99% | 2.23 | 2.0× |
| 45° | 1336 | 99% | 2.28 | 1.9× |
| 60° | 1249 | 92% | 2.42 | 1.7× |
| 67° off-grid best | 1185 | 88% | 2.44 | 1.6× |
| 70° | 1154 | 85% | 2.43 | 1.5× |
| 90° | 889 | 66% | 2.27 | 1.8× |
A fixed array in Oak Lawn produces the most over a year at 35°. The design month for an off-grid system is December: at 67° it makes 2.44 kWh per kWp a day, 16% more than at 35°, and costs 12% of the yearly total. Why steep panels win winter.
Off-grid solar in Oak Lawn at 70°
Daily energy of 1 kWp by month. Bars: panels at 70°. Line: panels at 35° (year-round best).
| Month | Sun hours, flat | Sun hours at 70° | kWh/kWp/day at 70° | at 35° | Mean temp. |
|---|---|---|---|---|---|
| January snow | 1.62 | 2.99 | 2.73 | 2.36 | -4.1 °C |
| February snow | 2.48 | 3.82 | 3.49 | 3.23 | -3.0 °C |
| March | 3.57 | 3.91 | 3.49 | 3.86 | 2.7 °C |
| April | 4.69 | 3.90 | 3.39 | 4.33 | 8.7 °C |
| May | 5.38 | 3.60 | 3.05 | 4.38 | 14.4 °C |
| June | 6.08 | 3.62 | 3.00 | 4.62 | 20.1 °C |
| July | 6.16 | 3.82 | 3.13 | 4.71 | 23.2 °C |
| August | 5.35 | 4.04 | 3.33 | 4.48 | 22.6 °C |
| September | 4.38 | 4.42 | 3.72 | 4.31 | 18.9 °C |
| October | 2.90 | 3.84 | 3.32 | 3.39 | 11.6 °C |
| November | 1.91 | 3.27 | 2.90 | 2.67 | 4.8 °C |
| December snow | 1.39 | 2.69 | 2.43 | 2.11 | -1.2 °C |
| Year | 3.83 avg | 3.66 avg | 1154 kWh | 1352 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 480 Wp of panels at 70°, versus 560 Wp at 35°. The steep array is 13% smaller for the same winter. Size your own system.
Row spacing in Oak Lawn
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.
5.4 mrow pitch at 70°
4.5 mrow pitch at 35°
How Oak Lawn compares in the United States
Against the other 3,120 places in the United States with climate data, for a fixed array at its best angle.
2518thof 3,121 places in the United States for sunshine, shared: 3.83 peak sun hours a day on flat ground.
−11%solar energy a year compared with the average place in the United States: 1,352 against 1,515 kWh per kWp.
+7 mindaylight on the longest day, compared with New York City: 15 h 13 min against 15 h 06 min.
35°best year-round tilt here; across the United States it runs from 18° in Honolulu to 53° in Fairbanks.
Of the 3,121 places in the United States, Fortuna Foothills and 2 other places get the most sun (5.96 peak sun hours a day) and Juneau the least (2.38); Oak Lawn ranks joint 2518th. In its darkest month, December, 1 kWp of off-grid panels at 70° makes 2.44 kWh a day here, against 2.55 kWh on average in the United States. The shortest day lasts 9 h 09 min, −6 min compared with New York City.
Solar forecast for Oak Lawn, 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 Oak Lawn
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A free, live card for Oak Lawn: 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.