Freeport weather in April

In April, Freeport sees average daytime highs of 58°F and overnight lows near 39°F, with 4.3 in of precipitation across 11.9 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 62°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 48 min by month's end. Set against the rest of the year, April is Freeport's 10th-clearest and 1st-windiest month. For the whole year in context, see Freeport's year-round climate.

Daytime high
58°
7th warmest
Overnight low
39°
6th coldest
Precipitation
4.3 in
11.9 wet days
Daylight
13 h 06 min
5:24 AM – 6:33 PM
Cloud cover
67%
10th clearest
Wind
9 mph
1st windiest
Solar energy
4.96 kWh/m²
Travel score
4.0
out of 10

Freeport is city and county seat and largest city of Stephenson County, Illinois, United States.

Density
802/km²
people per km²
Founded
1827

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 62°F by the end.

A typical April day in Freeport reaches about 58°F in the afternoon and slips back to 39°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 72°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
25335
35435
45436
55436
65536
75537
85537
95637
105637
115738
125738
135738
145839
155839
165840
175940
185940
196040
206041
216041
226042
236142
246142
256143
266243
276243
286244
296344
306345

How April really feels in Freeport

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.

Freeport 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° / 15°1.87.55.89.30.0
Feb33° / 18°1.86.65.110.30.0
Mar46° / 29°2.69.52.911.61.2
Apr58° / 39°4.311.91.113.14.0
May69° / 50°4.413.1014.45.9
Jun79° / 60°4.3120156.3
Jul82° / 64°3.610.4014.86.4
Aug80° / 62°3.79.9013.76.7
Sep73° / 54°3.68.8012.37.0
Oct60° / 42°2.98.80.210.85.0
Nov46° / 31°2.47.81.79.61.3
Dec34° / 21°2.17.64.690.0

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 12% of April, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13466
23466
33466
43466
53466
63466
73466
83565
93565
103565
113565
123664
133664
143664
153664
163664
173664
183664
193763
203763
213763
223763
233664
243664
253664
263664
273664
283664
293565
303565

Chance of precipitation in April

Any precipitationSnow

Freeport gets around 4.3 in of rain and snow over 11.9 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 41% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
1365
2365
3365
4375
5375
6385
7385
8386
9396
10395
11405
12405
13405
14415
15414
16414
17404
18403
19403
20403
21412
22412
23412
24412
25411
26411
27411
28411
29411
30411

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 (%)
19730
29730
39730
49730
59730
69730
79730
89730
99631
109631
119631
129631
139631
149631
159631
169631
179631
189631
199631
209631
219631
229631
239631
249631
259541
269541
279451
289451
299361
309361

Wind in April

Winds average 9 mph in April, the windiest month of the year.

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

051015151015202530
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light 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 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 84 minutes over April. Sunrise moves from 5:50 AM to 5:03 AM, and sunset from 6:16 PM to 6:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:506:16
212.55:496:17
312.55:476:18
412.65:456:19
512.65:436:21
612.75:416:22
712.75:406:23
812.85:386:24
912.85:366:25
1012.95:356:26
1112.95:336:27
1213.05:316:28
1313.05:296:30
1413.15:286:31
1513.15:266:32
1613.15:246:33
1713.25:236:34
1813.25:216:35
1913.35:196:36
2013.35:186:38
2113.45:166:39
2213.45:156:40
2313.55:136:41
2413.55:126:42
2513.65:106:43
2613.65:096:44
2713.65:076:46
2813.75:066:47
2913.75:046:48
3013.85:036:49

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 4.96 kWh/m².

For context, solar energy here swings from a low near 1.66 kWh/m² to a high of 6.32 kWh/m² in June across the year — April's 4.96 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.6Bright
44.6Bright
54.6Bright
64.7Bright
74.7Bright
84.7Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.9Bright
144.9Bright
154.9Bright
165.0Bright
175.0Bright
185.0Bright
195.1Bright
205.1Bright
215.1Bright
225.1Bright
235.2Bright
245.2Bright
255.2Bright
265.2Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Is April a good time to visit Freeport?

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

4.0
Sightseeing
7th-best month of the year
0.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Freeport for sightseeing.

What to pack for Freeport in April

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

In April, Freeport sees daytime highs around 58°F and nights near 39°F. Worth packing: a warm layer, rain gear and sun protection. About 12 days see rain.

a warm layerrain gearsun protection

UV index in Freeport 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 Freeport peaks around June 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJun 19UV 9Dec 22UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar4Moderate
Apr6High
May8Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Freeport 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 Freeport is worst in July — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (October, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodJul 1915 µg/m³Oct 238 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb13Moderate
Mar13Moderate
Apr12Good
May13Moderate
Jun14Moderate
Jul16Moderate
Aug14Moderate
Sep11Good
Oct8Good
Nov8Good
Dec9Good
Location & terrain

Where is Freeport?

Freeport sits at 42.3°N, 89.6°W, 778 ft above sea level, in United States. The nearest listed city is Rockford, 27 mi away.

Topography around Freeport

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

Within 2 miles, the terrain around Freeport has only modest variations in elevation — a maximum elevation change of 177 ft around an average of 797 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 472 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 853 ft.

The land around Freeport is covered by trees (33%), grassland (24%) and cropland (21%) within 2 miles, cropland (75%) within 10 miles, and cropland (67%) within 50 miles.

2 miles
177 ft
10 miles
472 ft
50 miles
853 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Rockford 27 mi · Loves Park 29 mi · Machesney Park 30 mi · Dixon 32 mi · Beloit 34 mi · Sterling 35 mi · Belvidere 40 mi · Janesville 40 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 Freeport (42.2967°, -89.6212°, elevation 778 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).