DeKalb weather in April

In April, DeKalb sees average daytime highs of 59°F and overnight lows near 40°F, with 4.4 in of precipitation across 12 wet days and about 13.1 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 54°F in the first days to 63°F by the end. The sky is clear or mostly clear about 23% 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 42 min by month's end. Set against the rest of the year, April is DeKalb's 9th-clearest and 1st-windiest month. For the whole year in context, see DeKalb's year-round climate.

Daytime high
59°
7th warmest
Overnight low
40°
6th coldest
Precipitation
4.4 in
12 wet days
Daylight
13 h 06 min
5:21 AM – 6:29 PM
Cloud cover
67%
9th clearest
Wind
10 mph
1st windiest
Solar energy
4.93 kWh/m²
Travel score
4.1
out of 10

DeKalb is city in De Kalb County, Illinois, United States.

Density
1,080/km²
people per km²
Founded
1837

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

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 54°F in the first days to 63°F by the end.

A typical April day in DeKalb reaches about 59°F in the afternoon and slips back to 40°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 44°F and 73°F. Set against its neighbours, April runs about 12°F warmer than March and about 11°F cooler than May.

20°40°60°80°151015202530
Avg high (°F)Avg low (°F)
15335
25435
35435
45536
55536
65536
75637
85637
95637
105738
115738
125838
135839
145839
155939
165940
175940
186040
196041
206041
216141
226142
236142
246242
256243
266243
276243
286344
296344
306445

How April really feels in DeKalb

Once humidity and wind are folded in, April averages 0 days that feel above 90°F and 12 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
12
wind chill below the day's low

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

DeKalb 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.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan29° / 16°2.07.65.79.30.0
Feb34° / 19°1.86.94.910.30.0
Mar46° / 29°2.69.32.911.71.3
Apr59° / 40°4.4120.913.14.1
May69° / 50°4.812.8014.35.9
Jun78° / 60°4.212.20156.3
Jul82° / 64°3.510.7014.76.4
Aug80° / 62°3.510.4013.76.6
Sep74° / 54°3.28.7012.37.0
Oct61° / 43°3.19.10.110.95.2
Nov47° / 32°2.47.71.69.61.5
Dec35° / 22°2.27.84.590.0

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 23% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 13% of April, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13367
23466
33466
43466
53565
63466
73565
83466
93565
103565
113565
123664
133664
143664
153664
163664
173763
183763
193862
203862
213763
223862
233763
243664
253763
263664
273664
283664
293664
303565

Chance of precipitation in April

Any precipitationSnow

DeKalb gets around 4.4 in of rain and snow over 12 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 40% and peaks near 42% on the wettest days, and about 1 day brings snow. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
1354
2364
3364
4364
5374
6374
7374
8384
9384
10394
11394
12404
13404
14404
15414
16413
17413
18413
19413
20412
21422
22422
23422
24421
25421
26421
27421
28421
29421
30421

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 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19820
29820
39820
49820
59820
69820
79730
89730
99730
109730
119631
129631
139631
149631
159631
169631
179631
189631
199631
209730
219640
229640
239640
249640
259550
269451
279451
289361
299361
309271

Wind in April

Winds average 10 mph in April, the windiest month of the year.

Across April, daily wind ranges from about 9 mph on the calmest days to 10 mph at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (mph)Feels
110light breeze
210light breeze
310light breeze
410light breeze
510light breeze
610light breeze
710light breeze
810light breeze
910light breeze
1010light breeze
1110light breeze
1210light breeze
1310light breeze
1410light breeze
1510light breeze
1610light breeze
1710light breeze
1810light breeze
1910light breeze
2010light breeze
2110light breeze
2210light breeze
2310light breeze
2410light breeze
259light breeze
269light breeze
279light breeze
289light breeze
299light breeze
309light breeze

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 24 min at the start of April to 13 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over April. Sunrise moves from 5:47 AM to 5:00 AM, and sunset from 6:12 PM to 6:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:476:12
212.55:456:13
312.55:436:15
412.65:426:16
512.65:406:17
612.75:386:18
712.75:376:19
812.85:356:20
912.85:336:21
1012.95:316:22
1112.95:306:24
1212.95:286:25
1313.05:266:26
1413.05:256:27
1513.15:236:28
1613.15:216:29
1713.25:206:30
1813.25:186:31
1913.35:166:32
2013.35:156:34
2113.45:136:35
2213.45:126:36
2313.45:106:37
2413.55:096:38
2513.55:076:39
2613.65:066:40
2713.65:046:41
2813.75:036:43
2913.75:016:44
3013.75:006:45

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.93 kWh/m².

For context, solar energy here swings from a low near 1.69 kWh/m² to a high of 6.29 kWh/m² in June across the year — April's 4.93 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.6Bright
54.6Bright
64.6Bright
74.7Bright
84.7Bright
94.7Bright
104.8Bright
114.8Bright
124.8Bright
134.9Bright
144.9Bright
154.9Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.2Bright
285.2Bright
295.3Bright
305.3Bright
Planning a trip in April

Is April a good time to visit DeKalb?

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

4.1
Sightseeing
7th-best month of the year
0.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit DeKalb for sightseeing.

What to pack for DeKalb in April

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

In April, DeKalb sees daytime highs around 59°F and nights near 40°F. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

UV index in DeKalb in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in DeKalb peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 19UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in DeKalb in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in DeKalb is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1817 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar16Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is DeKalb?

DeKalb sits at 41.9°N, 88.8°W, 879 ft above sea level, in United States. The nearest listed city is Sycamore, 5.0 mi away.

Topography around DeKalb

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

Within 2 miles, the terrain around DeKalb has only modest variations in elevation — a maximum elevation change of 102 ft around an average of 883 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 308 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 850 ft.

The land around DeKalb is covered by artificial surfaces (35%), trees (23%) and grassland (23%) within 2 miles, cropland (84%) within 10 miles, and cropland (59%) within 50 miles.

2 miles
102 ft
10 miles
308 ft
50 miles
850 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Sycamore 5.0 mi · Wasco 18 mi · St. Charles 23 mi · Geneva 23 mi · Batavia 23 mi · Huntley 24 mi · North Aurora 24 mi · Belvidere 24 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 DeKalb (41.9295°, -88.7504°, elevation 879 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. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).