Castle Rock weather in April

In April, Castle Rock sees average daytime highs of 55°F and overnight lows near 28°F, with 2.6 in of precipitation across 9.7 wet days and about 13 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 52°F in the first days to 58°F by the end. The sky is clear or mostly clear about 32% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 24 min at the start of April to 13 h 36 min by month's end. Set against the rest of the year, April is Castle Rock's 11th-clearest and 1st-windiest month. For the whole year in context, see Castle Rock's year-round climate.

Daytime high: 55°; 7th warmest
Overnight low: 28°; 6th coldest
Precipitation: 2.6 in; 9.7 wet days
Daylight: 13 hours; 5:29 AM – 6:31 PM
Cloud cover: 55%; 11th clearest
Wind: 7 mph; 1st windiest
Solar energy: 6.41 kWh/m²
Travel score: 3.5; out of 10

Castle Rock is town in and seat of Douglas County, Colorado, United States.

Density: 635/km²; people per km²
Founded: 1874

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← March Castle Rock year-round climate May →Best places to visit in April

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 52°F in the first days to 58°F by the end.

A typical April day in Castle Rock reaches about 55°F in the afternoon and slips back to 28°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 38°F and 69°F. Set against its neighbours, April runs about 6°F warmer than March and about 10°F cooler than May.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°F)	52	52	52	53	53	53	53	53	53	54	54	54	54	54	55	55	55	55	55	55	56	56	56	56	57	57	57	58	58	58
Avg low (°F)	25	25	25	26	26	26	26	26	27	27	27	27	28	28	28	28	28	29	29	29	29	30	30	30	31	31	31	32	32	33

	Avg high (°F)	Avg low (°F)
1	52	25
2	52	25
3	52	25
4	53	26
5	53	26
6	53	26
7	53	26
8	53	26
9	53	27
10	54	27
11	54	27
12	54	27
13	54	28
14	54	28
15	55	28
16	55	28
17	55	28
18	55	29
19	55	29
20	55	29
21	56	29
22	56	30
23	56	30
24	56	30
25	57	31
26	57	31
27	57	31
28	58	32
29	58	32
30	58	33

How April really feels in Castle Rock

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 30 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

The story in April is cold — wind chill drags the overnight "feels like" below the raw low.

Castle Rock weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 2nd-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	39° / 12°	0.6	4.2	4.7	9.5	0.0
Feb	42° / 15°	0.7	5	5.4	10.5	0.3
Mar	49° / 22°	1.7	6.9	5.9	11.7	2.2
Apr	55° / 28°	2.6	9.7	6.1	13	3.5
May	65° / 39°	3.0	12.3	1.7	14.1	5.5
Jun	76° / 48°	2.1	10.2	0.1	14.7	6.8
Jul	81° / 54°	2.5	10.9	0	14.5	6.5
Aug	79° / 52°	2.0	10.1	0	13.5	6.9
Sep	72° / 45°	1.3	6.4	0.5	12.3	7.6
Oct	60° / 32°	1.4	5.5	2.4	11	5.7
Nov	48° / 21°	1.0	4.9	4.9	9.8	2.0
Dec	39° / 12°	0.7	3.9	4.4	9.3	0.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 20% of April, with mostly cloudy or overcast conditions the remaining 48%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	55	55	55	54	54	54	54	53	53	53	53	53	52	52	52	52	52	51	51	51	51	51	52	52	52	52	51	51	52	52
Cloudier (%)	45	45	45	46	46	46	46	47	47	47	47	47	48	48	48	48	48	49	49	49	49	49	48	48	48	48	49	49	48	48

	Clearer (%)	Cloudier (%)
1	55	45
2	55	45
3	55	45
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	53	47
11	53	47
12	53	47
13	52	48
14	52	48
15	52	48
16	52	48
17	52	48
18	51	49
19	51	49
20	51	49
21	51	49
22	51	49
23	52	48
24	52	48
25	52	48
26	52	48
27	51	49
28	51	49
29	52	48
30	52	48

Chance of precipitation in April

Any precipitationSnow

Castle Rock gets around 2.6 in of rain and snow over 9.7 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 32% and peaks near 37% on the wettest days, and about 6 days bring snow. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	29	29	29	28	28	28	28	28	29	29	29	29	30	30	31	32	32	33	34	34	35	35	36	36	36	37	37	37	37	37
Snow chance (%)	23	23	22	22	22	21	21	21	20	20	20	19	19	19	19	19	19	19	19	19	19	19	19	18	18	18	17	16	16	15

	Rain chance (%)	Snow chance (%)
1	29	23
2	29	23
3	29	22
4	28	22
5	28	22
6	28	21
7	28	21
8	28	21
9	29	20
10	29	20
11	29	20
12	29	19
13	30	19
14	30	19
15	31	19
16	32	19
17	32	19
18	33	19
19	34	19
20	34	19
21	35	19
22	35	19
23	36	19
24	36	18
25	36	18
26	37	18
27	37	17
28	37	16
29	37	16
30	37	15

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

Wind in April

Winds average 7 mph in April, the windiest month of the year.

Across April, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (mph)	6	6	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	7	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	6	calm
2	6	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	calm
8	7	calm
9	7	calm
10	7	calm
11	7	calm
12	7	calm
13	7	calm
14	7	calm
15	7	calm
16	7	calm
17	7	calm
18	7	calm
19	7	calm
20	7	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over April. Sunrise moves from 5:53 AM to 5:09 AM, and sunset from 6:16 PM to 6:45 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.4	12.4	12.5	12.5	12.6	12.6	12.6	12.7	12.7	12.8	12.8	12.9	12.9	12.9	13.0	13.0	13.1	13.1	13.2	13.2	13.2	13.3	13.3	13.4	13.4	13.4	13.5	13.5	13.6	13.6
Sunrise (AM)	5:53	5:51	5:49	5:48	5:46	5:44	5:43	5:41	5:40	5:38	5:36	5:35	5:33	5:32	5:30	5:29	5:27	5:26	5:24	5:23	5:21	5:20	5:18	5:17	5:16	5:14	5:13	5:12	5:10	5:09
Sunset (PM)	6:16	6:17	6:18	6:19	6:20	6:21	6:22	6:23	6:24	6:25	6:26	6:27	6:28	6:29	6:30	6:31	6:32	6:33	6:34	6:35	6:36	6:37	6:38	6:39	6:40	6:41	6:42	6:43	6:44	6:45

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.4	5:53	6:16
2	12.4	5:51	6:17
3	12.5	5:49	6:18
4	12.5	5:48	6:19
5	12.6	5:46	6:20
6	12.6	5:44	6:21
7	12.6	5:43	6:22
8	12.7	5:41	6:23
9	12.7	5:40	6:24
10	12.8	5:38	6:25
11	12.8	5:36	6:26
12	12.9	5:35	6:27
13	12.9	5:33	6:28
14	12.9	5:32	6:29
15	13.0	5:30	6:30
16	13.0	5:29	6:31
17	13.1	5:27	6:32
18	13.1	5:26	6:33
19	13.2	5:24	6:34
20	13.2	5:23	6:35
21	13.2	5:21	6:36
22	13.3	5:20	6:37
23	13.3	5:18	6:38
24	13.4	5:17	6:39
25	13.4	5:16	6:40
26	13.4	5:14	6:41
27	13.5	5:13	6:42
28	13.5	5:12	6:43
29	13.6	5:10	6:44
30	13.6	5:09	6:45

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 6.41 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 7.41 kWh/m² in June across the year — April's 6.41 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	6.0	6.0	6.1	6.1	6.2	6.2	6.2	6.2	6.3	6.3	6.3	6.3	6.4	6.4	6.4	6.4	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.6	6.6	6.6	6.6	6.6	6.7	6.7
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense

	Solar energy (kWh/m²)	Level
1	6.0	Intense
2	6.0	Intense
3	6.1	Intense
4	6.1	Intense
5	6.2	Intense
6	6.2	Intense
7	6.2	Intense
8	6.2	Intense
9	6.3	Intense
10	6.3	Intense
11	6.3	Intense
12	6.3	Intense
13	6.4	Intense
14	6.4	Intense
15	6.4	Intense
16	6.4	Intense
17	6.5	Intense
18	6.5	Intense
19	6.5	Intense
20	6.5	Intense
21	6.5	Intense
22	6.5	Intense
23	6.5	Intense
24	6.6	Intense
25	6.6	Intense
26	6.6	Intense
27	6.6	Intense
28	6.6	Intense
29	6.7	Intense
30	6.7	Intense

Planning a trip in April

Is April a good time to visit Castle Rock?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.5

Sightseeing

7th-best month of the year

0.0

Beach & pool

7th-best month of the year

April is a weaker month for outdoor sightseeing in Castle Rock.

What to pack for Castle Rock in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Castle Rock sees daytime highs around 55°F and nights near 28°F. Pack sun protection. Worth having: a warm layer and rain gear. About 10 days see rain.

sun protectiona warm layerrain gear

UV index in Castle Rock in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Castle Rock peaks around July 15 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	4	7	7	8	11	11	10	8	6	4	2
Level	Moderate	Moderate	Very high	High	Very high	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	4	Moderate
Mar	7	Very high
Apr	7	High
May	8	Very high
Jun	11	Extreme
Jul	11	Extreme
Aug	10	Extreme
Sep	8	Very high
Oct	6	High
Nov	4	Moderate
Dec	2	Moderate

Location & terrain

Where is Castle Rock?

Castle Rock sits at 39.4°N, 104.9°W, 6,224 ft above sea level, in United States. The nearest listed city is Parker, 11 mi away.

Topography around Castle Rock

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Castle Rock.

Within 2 miles, the terrain around Castle Rock has only modest variations in elevation — a maximum elevation change of 646 ft around an average of 6,368 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,028 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,268 ft.

The land around Castle Rock is covered by grassland (52%) and artificial surfaces (28%) within 2 miles, grassland (74%) within 10 miles, and grassland (55%) and trees (29%) within 50 miles.

2 miles

646 ft

grassland 52%

10 miles

2,028 ft

grassland 74%

50 miles

9,268 ft

grassland 55%

treesgrasslandcroplandartificial surfacesbare terrainwater

← March Castle Rock year-round climate May →Best places to visit in April

April weather nearby: Parker 11 mi · Highlands Ranch 14 mi · Centennial 14 mi · Castlewood 15 mi · Southglenn 16 mi · Greenwood Village 17 mi · Littleton 19 mi · Columbine 19 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Castle Rock (39.3722°, -104.8561°, elevation 6,224 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°F)	Avg low (°F)
1	52	25
2	52	25
3	52	25
4	53	26
5	53	26
6	53	26
7	53	26
8	53	26
9	53	27
10	54	27
11	54	27
12	54	27
13	54	28
14	54	28
15	55	28
16	55	28
17	55	28
18	55	29
19	55	29
20	55	29
21	56	29
22	56	30
23	56	30
24	56	30
25	57	31
26	57	31
27	57	31
28	58	32
29	58	32
30	58	33

	Clearer (%)	Cloudier (%)
1	55	45
2	55	45
3	55	45
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	53	47
11	53	47
12	53	47
13	52	48
14	52	48
15	52	48
16	52	48
17	52	48
18	51	49
19	51	49
20	51	49
21	51	49
22	51	49
23	52	48
24	52	48
25	52	48
26	52	48
27	51	49
28	51	49
29	52	48
30	52	48

	Rain chance (%)	Snow chance (%)
1	29	23
2	29	23
3	29	22
4	28	22
5	28	22
6	28	21
7	28	21
8	28	21
9	29	20
10	29	20
11	29	20
12	29	19
13	30	19
14	30	19
15	31	19
16	32	19
17	32	19
18	33	19
19	34	19
20	34	19
21	35	19
22	35	19
23	36	19
24	36	18
25	36	18
26	37	18
27	37	17
28	37	16
29	37	16
30	37	15

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°F)	Avg low (°F)
1	52	25
2	52	25
3	52	25
4	53	26
5	53	26
6	53	26
7	53	26
8	53	26
9	53	27
10	54	27
11	54	27
12	54	27
13	54	28
14	54	28
15	55	28
16	55	28
17	55	28
18	55	29
19	55	29
20	55	29
21	56	29
22	56	30
23	56	30
24	56	30
25	57	31
26	57	31
27	57	31
28	58	32
29	58	32
30	58	33

	Clearer (%)	Cloudier (%)
1	55	45
2	55	45
3	55	45
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	53	47
11	53	47
12	53	47
13	52	48
14	52	48
15	52	48
16	52	48
17	52	48
18	51	49
19	51	49
20	51	49
21	51	49
22	51	49
23	52	48
24	52	48
25	52	48
26	52	48
27	51	49
28	51	49
29	52	48
30	52	48

	Rain chance (%)	Snow chance (%)
1	29	23
2	29	23
3	29	22
4	28	22
5	28	22
6	28	21
7	28	21
8	28	21
9	29	20
10	29	20
11	29	20
12	29	19
13	30	19
14	30	19
15	31	19
16	32	19
17	32	19
18	33	19
19	34	19
20	34	19
21	35	19
22	35	19
23	36	19
24	36	18
25	36	18
26	37	18
27	37	17
28	37	16
29	37	16
30	37	15

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°F)	Avg low (°F)
1	52	25
2	52	25
3	52	25
4	53	26
5	53	26
6	53	26
7	53	26
8	53	26
9	53	27
10	54	27
11	54	27
12	54	27
13	54	28
14	54	28
15	55	28
16	55	28
17	55	28
18	55	29
19	55	29
20	55	29
21	56	29
22	56	30
23	56	30
24	56	30
25	57	31
26	57	31
27	57	31
28	58	32
29	58	32
30	58	33

	Clearer (%)	Cloudier (%)
1	55	45
2	55	45
3	55	45
4	54	46
5	54	46
6	54	46
7	54	46
8	53	47
9	53	47
10	53	47
11	53	47
12	53	47
13	52	48
14	52	48
15	52	48
16	52	48
17	52	48
18	51	49
19	51	49
20	51	49
21	51	49
22	51	49
23	52	48
24	52	48
25	52	48
26	52	48
27	51	49
28	51	49
29	52	48
30	52	48

	Rain chance (%)	Snow chance (%)
1	29	23
2	29	23
3	29	22
4	28	22
5	28	22
6	28	21
7	28	21
8	28	21
9	29	20
10	29	20
11	29	20
12	29	19
13	30	19
14	30	19
15	31	19
16	32	19
17	32	19
18	33	19
19	34	19
20	34	19
21	35	19
22	35	19
23	36	19
24	36	18
25	36	18
26	37	18
27	37	17
28	37	16
29	37	16
30	37	15

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100