Sunlight Hours in Changshu
Sunlight hours, shadow patterns, and solar analysis for Changshu, China
Interactive 3D Shadow Map
Summer afternoon in Changshu
Changshu
3:30 PM • Summer Solstice
Interactive 3D shadow analysis map of Changshu. Shows real building shadows based on sun position calculations. Features include: time-of-day simulation, date selection for seasonal analysis, 3D building rendering, tree shadows, terrain elevation, and sun position indicators. Powered by Mapbox GL JS and SunCalc astronomical calculations.
Today's Sunlight
March Average
Sunrise
06:09
Sunset
18:02
Total Daylight
11h 55m
Sun Altitude
57°
at noon
Seasonal Extremes
Longest Day
14.1h
2026-06-21
Shortest Day
10.0h
2026-12-21
Explore Shadows in 3D
See exactly how building shadows fall across Changshu at any time of day or year.
31.6461°
120.7422°
Best Time to Visit Changshu
Month-by-month daylight conditions
Changshu has moderate seasonal variation (4.1h difference between longest and shortest days). May-August offers the best conditions for outdoor activities.
Peak Months
Jun, Jul, May, Aug
Shoulder Season
Apr & Sep
Winter
Jan
10.3h
Good
Winter
Feb
11.0h
Good
Spring
Mar
11.9h
Great
Spring
Apr
12.9h
Excellent
Spring
May
13.7h
Excellent
Summer
Jun
14.1h
Excellent
Summer
Jul
13.9h
Excellent
Summer
Aug
13.2h
Excellent
Autumn
Sep
12.2h
Great
Autumn
Oct
11.3h
Good
Autumn
Nov
10.5h
Good
Winter
Dec
10.1h
Fair
Golden Hour in Changshu
Best times for photography
March Golden Hour
06:09 - 07:09
Blue hour from 05:39
17:02 - 18:02
Blue hour until 18:32
Best Months
- 1Year-round — Consistent golden hour length
- 2Oct-Apr — Milder temperatures for outdoor shoots
- 3Jun-Aug — Latest sunsets for evening shoots
Photography Tips
- Golden hour transitions are relatively quick - be prepared and in position early
- Midday sun can be harsh; use it for high-contrast architectural photography
- Face south during midday for even lighting on subjects
- Check the 3D shadow map to scout locations and predict light direction
Understanding Changshu's Sunlight
AI-powered insights for your location
Changshu's mid-latitude location (31.6°N) creates moderate seasonal variation, with winter days 4.1 hours shorter than summer. The sun reaches 82° at summer noon but only 35° in winter.
Key Challenges
- 1Low winter sun angle (35°) affects south-facing properties
- 2Consider local weather patterns that may affect sunshine
- 3Urban buildings may create additional shadows
Best Months
April through September offers the longest days and highest sun angles in the Northern Hemisphere.
Garden Tips
South-facing gardens receive the most consistent sunlight year-round in Changshu. Consider shadow patterns from neighboring structures when planning outdoor spaces.
Solar Energy Potential
Is Changshu good for solar panels?
With approximately 1,984 annual sun hours, Changshu has good solar potential. A well-designed system can significantly reduce electricity costs.
Annual Sun Hours
1,984
estimated
Optimal Panel Tilt
32°
facing south
Peak Production
Jun, Jul, May
highest output
Relative Monthly Production
Installation Tips for Changshu
- Orient panels south with a 32° tilt for optimal year-round performance
- Use the 3D shadow map to check for obstructions from trees or neighboring buildings
- Consider seasonal tilt adjustment: steeper in winter (47°), flatter in summer (17°)
UV Index & Sun Safety
Protect yourself in Changshu
March UV Index
Maximum protection essential. Avoid outdoor activities during peak hours.
Monthly UV Index
Peak UV Months
May, Jun, Jul have the highest UV levels (up to 13). Take extra precautions during these months.
Protection Needed
- SPF 50+ broad-spectrum sunscreen
- Full coverage clothing and wide-brim hat
- Stay indoors 10am-4pm
Outdoor Activities in Changshu
Best times for popular activities
Best Activities in March
Gardening
54% match
Outdoor Dining
24% match
Hiking & Walking
24% match
Year-Round Activity Guide
| Activity | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Outdoor Dining | ★ | ★ | ★ | ★ | ★ | |||||||
| Hiking & Walking | ★ | ★ | ★ | ★ | ||||||||
| Beach & Swimming | ★ | ★ | ★ | |||||||||
| Photography | ★ | ★ | ★ | ★ | ★ | |||||||
| Gardening | ★ | ★ | ★ | ★ | ★ | |||||||
| Running & Cycling | ★ | ★ | ★ | ★ | ★ | ★ | ★ |
Outdoor Dining
Enjoy al fresco dining during the warmer months with longer evening light.
Hiking & Walking
Mild temperatures and good daylight make spring and autumn ideal for trails.
Beach & Swimming
Peak sun and warmest temperatures during summer months.
Seasonal Sunlight Calendar
Monthly averages throughout the year
| Month | Sunrise | Sunset | Daylight | Sun Angle |
|---|---|---|---|---|
January | 06:59 | 17:13 | 10h 17m | 38° |
February | 06:40 | 17:41 | 11h 1m | 46° |
March | 06:09 | 18:02 | 11h 55m | 57° |
April | 05:30 | 18:23 | 12h 53m | 68° |
May | 05:02 | 18:44 | 13h 40m | 77° |
☀️June | 04:54 | 19:00 | 14h 4m | 81° |
☀️July | 05:05 | 19:00 | 13h 52m | 79° |
☀️August | 05:25 | 18:37 | 13h 10m | 72° |
September | 05:44 | 17:59 | 12h 14m | 61° |
October | 06:03 | 17:21 | 11h 17m | 49° |
November | 06:28 | 16:54 | 10h 28m | 40° |
December | 06:52 | 16:52 | 10h 3m | 36° |
Summer Solstice
14.1h daylight
Winter Solstice
10.0h daylight
Explore Nearby Cities
Sunlight data for surrounding areas
Frequently Asked Questions
Sunlight in Changshu
1How many hours of sunlight does Changshu get?
How many hours of sunlight does Changshu get?
Changshu receives an average of 12.1 hours of daylight per day. This varies throughout the year, from 10.0 hours on the shortest day to 14.1 hours on the longest day.
2What is the sun angle in Changshu during winter?
What is the sun angle in Changshu during winter?
During winter solstice, the sun reaches a maximum altitude of only 34.9° above the horizon at solar noon in Changshu. This creates shadows that are 1.4x the height of objects.
3When is the best time for outdoor activities in Changshu?
When is the best time for outdoor activities in Changshu?
April through September offers the longest days and highest sun angles in the Northern Hemisphere.
4How do I plan a garden in Changshu for maximum sunlight?
How do I plan a garden in Changshu for maximum sunlight?
South-facing gardens receive the most consistent sunlight year-round in Changshu. Consider shadow patterns from neighboring structures when planning outdoor spaces.
5What time is golden hour in Changshu?
What time is golden hour in Changshu?
In March, golden hour in Changshu occurs in the morning from 06:09 - 07:09 and in the evening from 17:02 - 18:02. These times shift throughout the year as sunrise and sunset times change.
6What is the UV index in Changshu?
What is the UV index in Changshu?
The UV index in Changshu varies by season. During summer, UV can reach 13 (very high), while winter UV levels are much lower. Always check daily UV forecasts and wear SPF 30+ sunscreen during peak hours (10am-4pm).
7Are solar panels worth it in Changshu?
Are solar panels worth it in Changshu?
Changshu receives approximately 1,984 hours of sunshine annually. This makes it a good location for solar panels, with typical payback periods of 5-10 years. For optimal performance, orient panels south at a 32° tilt angle.
8When is sunrise and sunset in Changshu?
When is sunrise and sunset in Changshu?
In March, sunrise in Changshu is around 06:09 and sunset is around 18:02, giving 11.9 hours of daylight. The earliest sunrise occurs around the summer solstice (04:55) and latest sunset follows shortly after.
9What is the best month to visit Changshu for weather?
What is the best month to visit Changshu for weather?
For optimal daylight and outdoor conditions in Changshu, April through September offers the longest days and highest sun angles in the Northern Hemisphere. The shoulder seasons often offer a good balance of pleasant weather and fewer crowds.
10How long are shadows in Changshu?
How long are shadows in Changshu?
Shadow length varies dramatically by season in Changshu. At summer noon, shadows are only 0.1x the height of objects (sun at 82°). In winter, shadows extend to 1.4x object height (sun at just 35°).