Castle Clinton National Monument in April
April at Castle Clinton National Monument averages a daytime high near 62°F and an overnight low around 46°F, with about 4.1" of precipitation. Visitation runs about 1× the park's average month, which makes April an average month here.
- Average low
- 46°F
- Average high
- 62°F
Range across the year: 28°F to 85°F
- Precipitation
- 4.1 in
- Daylight
- 13.1 hours
Roughly 9% of the park's yearly visitors come in April: about 343,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes April the 6th-busiest of the park's twelve months, sitting between the July peak (1.6×) and the January low (0.5×).
On our Best Time to Visit score April rates 52/100 ("Fair"). Our recommended month is September: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 54°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 5.8 miles from the park.
Because June, July and August together draw about 37% of annual visitors, choosing April instead steps outside that summer crush — the single biggest lever on how crowded the park feels.
You'll have about 13.1 hours of daylight in April to explore — between the 9.1-hour midwinter low and the 14.9-hour summer high.
Park-wide, 2025 drew 3,656,350 recreation visits, down 4.4% from 3,822,759 in 2024.
Across the past decade overall visitation has eased about 28.2%, so April may feel a touch quieter than it once did.
How April compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| March | 50°F / 36°F | 0.8× Quiet | 37 Poor |
| April | 62°F / 46°F | 1.0× Average | 52 Fair |
| May | 71°F / 55°F | 1.2× Busy | 61 Good |
All twelve months at Castle Clinton, with the best time to visit.
Frequently Asked Questions
April averages a daytime high near 62°F and an overnight low around 46°F at Castle Clinton National Monument, with about 4.1 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 5.8 miles from the park, so conditions inside the park can differ, especially at other elevations.
April is average at Castle Clinton National Monument (about 1.0× the average month). Our best-time score rates it "Fair" at 52/100. Our recommended month is September.
The busiest month is July and the quietest is January. April sits at about 1.0× the park's average, or 9% of annual visitation.
A typical April sees about 343,000 recreation visits at Castle Clinton National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Castle Clinton in April
Booking a April trip to Castle Clinton National Monument? Compare hotels, cabins and vacation rentals near the park with live April availability and prices.
Top-rated places to stay near Castle Clinton
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See the full ranking of the best national parks to visit in April.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.