Sunrise and Sunset times in Roundup, United States 
Today:
 Sunrise: 07:42:12
|
 Sunset: 16:27:46
|
Day Length: 8h 45m 34s
Time zone: America/Denver, UTC -7 h.
Latitude: 46.4485, Longitude: -108.54
Roundup
Montana, United States 
1 857 people
| Date | Sunrise | Solar Noon | Sunset | Day length |
|---|---|---|---|---|
| 2025-Dec-01, Monday | 07:37:43 | 12:03:23 | 16:29:03 | 8h 51m 20s |
| 2025-Dec-02, Tuesday | 07:38:52 | 12:03:46 | 16:28:39 | 8h 49m 47s |
| 2025-Dec-03, Wednesday | 07:40:00 | 12:04:10 | 16:28:19 | 8h 48m 19s |
| 2025-Dec-04, Thursday | 07:41:07 | 12:04:34 | 16:28:01 | 8h 46m 54s |
| 2025-Dec-05, Friday | 07:42:12 | 12:04:59 | 16:27:46 | 8h 45m 34s |
| 2025-Dec-06, Saturday | 07:43:15 | 12:05:24 | 16:27:33 | 8h 44m 18s |
| 2025-Dec-07, Sunday | 07:44:17 | 12:05:50 | 16:27:24 | 8h 43m 7s |
| 2025-Dec-08, Monday | 07:45:16 | 12:06:16 | 16:27:17 | 8h 42m 1s |
| 2025-Dec-09, Tuesday | 07:46:14 | 12:06:43 | 16:27:13 | 8h 40m 59s |
| 2025-Dec-10, Wednesday | 07:47:10 | 12:07:11 | 16:27:12 | 8h 40m 2s |
| 2025-Dec-11, Thursday | 07:48:03 | 12:07:38 | 16:27:13 | 8h 39m 10s |
| 2025-Dec-12, Friday | 07:48:55 | 12:08:06 | 16:27:17 | 8h 38m 22s |
| 2025-Dec-13, Saturday | 07:49:45 | 12:08:35 | 16:27:25 | 8h 37m 40s |
| 2025-Dec-14, Sunday | 07:50:32 | 12:09:03 | 16:27:34 | 8h 37m 2s |
| 2025-Dec-15, Monday | 07:51:17 | 12:09:32 | 16:27:47 | 8h 36m 30s |
| 2025-Dec-16, Tuesday | 07:52:00 | 12:10:01 | 16:28:03 | 8h 36m 3s |
| 2025-Dec-17, Wednesday | 07:52:40 | 12:10:31 | 16:28:21 | 8h 35m 41s |
| 2025-Dec-18, Thursday | 07:53:19 | 12:11:00 | 16:28:42 | 8h 35m 23s |
| 2025-Dec-19, Friday | 07:53:54 | 12:11:30 | 16:29:06 | 8h 35m 12s |
| 2025-Dec-20, Saturday | 07:54:27 | 12:12:00 | 16:29:32 | 8h 35m 5s |
| 2025-Dec-21, Sunday | 07:54:58 | 12:12:29 | 16:30:01 | 8h 35m 3s |
| 2025-Dec-22, Monday | 07:55:26 | 12:12:59 | 16:30:32 | 8h 35m 6s |
| 2025-Dec-23, Tuesday | 07:55:52 | 12:13:29 | 16:31:07 | 8h 35m 15s |
| 2025-Dec-24, Wednesday | 07:56:14 | 12:13:59 | 16:31:43 | 8h 35m 29s |
| 2025-Dec-25, Thursday | 07:56:35 | 12:14:29 | 16:32:23 | 8h 35m 48s |
| 2025-Dec-26, Friday | 07:56:52 | 12:14:58 | 16:33:04 | 8h 36m 12s |
| 2025-Dec-27, Saturday | 07:57:07 | 12:15:28 | 16:33:48 | 8h 36m 41s |
| 2025-Dec-28, Sunday | 07:57:19 | 12:15:57 | 16:34:35 | 8h 37m 16s |
| 2025-Dec-29, Monday | 07:57:29 | 12:16:26 | 16:35:24 | 8h 37m 55s |
| 2025-Dec-30, Tuesday | 07:57:35 | 12:16:55 | 16:36:15 | 8h 38m 40s |
| 2025-Dec-31, Wednesday | 07:57:39 | 12:17:24 | 16:37:08 | 8h 39m 29s |
Day length in Roundup during the year on the chart:
Roundup on United States map:
Locations in the same time zone America/Denver
Denver (Colorado), Salt Lake City (Utah), El Paso (Texas), Albuquerque (New Mexico), Colorado Springs (Colorado), Ogden (Utah), Provo (Utah), Aurora (Colorado), Fort Collins (Colorado), Lakewood (Colorado), Pueblo (Colorado), Thornton (Colorado), Grand Junction (Colorado), West Valley City (Utah), Las Cruces (New Mexico), Greeley (Colorado), Boulder (Colorado), Billings (Montana), Arvada (Colorado), St. George (Utah), West Jordan (Utah), Westminster (Colorado), Centennial (Colorado), Santa Fe (New Mexico), Highlands Ranch (Colorado), Logan (Utah), Longmont (Colorado), Orem (Utah), Rio Rancho (New Mexico), Sandy (Utah)
Largest populated areas in United States
New York (New York), Los Angeles (California), Chicago (Illinois), Miami (Florida), Dallas (Texas), Philadelphia (Pennsylvania), Houston (Texas), Washington (District of Columbia), Atlanta (Georgia), Boston (Massachusetts), Phoenix (Arizona), Seattle (Washington), San Francisco (California), Detroit (Michigan), San Diego (California), Minneapolis (Minnesota), Tampa (Florida), Denver (Colorado), Brooklyn (New York), Queens (New York), Baltimore (Maryland), Riverside (California), St. Louis (Missouri), Las Vegas (Nevada), Portland (Oregon), San Antonio (Texas), Sacramento (California), San Jose (California), Orlando (Florida), Cleveland (Ohio)
Countries closest to United States
*Calculation of distances from capital to capital
Daylight Hours FAQ: 10 Most Googled Questions Answered
Daylight hours refer to the period between sunrise and sunset. This duration changes throughout the year based on season and geographic location.
Earth's 23.5° axial tilt causes uneven sunlight distribution. Your hemisphere receives less direct sunlight in winter (shorter days) and more in summer (longer days).
Northern Hemisphere: June 20-22 (summer solstice).
Southern Hemisphere: December 21-23.
Near polar circles, the sun doesn't set for 24 hours.
Northern Hemisphere: December 21-22 (winter solstice).
Southern Hemisphere: June 20-21.
The closer to poles, the more extreme variations:
- Equator: ~12-hour days year-round
- Polar regions: Midnight sun/polar nights occur
Miami's lower latitude means:
- Winter days are longer than NY's
- Summer days are slightly shorter
During equinoxes:
- Spring: March 20-21
- Fall: September 22-23
Most rapid change near equinoxes: 2-4 minutes daily.
Slowest change near solstices: <1 minute daily.
Reliable tools:
- Timeanddate.com
- SunCalc.org
- Photographer's Ephemeris app
Yes. Reduced winter sunlight may cause:
- Seasonal Affective Disorder (SAD)
- Vitamin D deficiency
Solution: Light therapy lamps & midday walks