Crystal Lake in Summer
In summer (June, July and August), Crystal Lake sees average daytime highs around 80°F and overnight lows near 63°F, with 10.9 in of rain over about 33 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 74°F in early June to 79°F by late August. The sky is clear or mostly clear about 33% of the time across summer, and the air most often feels muggy.
Summer is Crystal Lake's best season of the year to visit on our travel score. For the whole year in context, see Crystal Lake's year-round climate.
- Avg daytime high
- 80°F
- warmest season of the year
- Avg overnight low
- 63°F
- Rainfall
- 10.9 in
- 33 wet days
- Avg wind
- 7 mph
- Travel score
- 6.5
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Crystal Lake in Summer
Over the season highs climb from about 74°F in early June to 79°F by late August.
A typical summer day in Crystal Lake reaches about 80°F and drops to 63°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Crystal Lake
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Crystal Lake weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 30° / 17° | 2.0 | 7.9 | 6 | 9.3 | 0.0 |
| Feb | 34° / 20° | 1.9 | 7 | 5.2 | 10.3 | 0.0 |
| Mar | 45° / 29° | 2.5 | 9.7 | 3.3 | 11.6 | 1.1 |
| Apr | 57° / 39° | 4.3 | 12.3 | 1.1 | 13.1 | 3.7 |
| May | 68° / 50° | 4.3 | 12.2 | 0 | 14.4 | 5.9 |
| Jun | 78° / 61° | 3.8 | 11.8 | 0 | 15 | 6.4 |
| Jul | 82° / 65° | 3.4 | 10.4 | 0 | 14.8 | 6.4 |
| Aug | 80° / 63° | 3.6 | 10.6 | 0 | 13.7 | 6.6 |
| Sep | 73° / 55° | 3.0 | 8.8 | 0 | 12.3 | 7.0 |
| Oct | 60° / 44° | 3.0 | 8.7 | 0.2 | 10.8 | 5.0 |
| Nov | 46° / 33° | 2.4 | 7.8 | 1.6 | 9.6 | 1.4 |
| Dec | 35° / 22° | 2.1 | 8 | 4.6 | 9 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 33% of the time across summer.
Chance of precipitation in Summer
Crystal Lake gets around 10.9 in of rain over 33 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 48 min in early June to 13 hours by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 6.0 kWh/m².
Is summer a good time to visit Crystal Lake?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Crystal Lake for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Crystal Lake in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Crystal Lake sees daytime highs around 80°F and nights near 63°F. Pack light clothes and sun protection. Worth having: rain gear. About 33 days see rain.
Sea temperature near Crystal Lake in Summer
The nearest coast averages about 65°F across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 24 mi away) is warmest in August at about 71°F and coldest in March near 36°F.
It's comfortable for a long swim from Jul 18 to Sep 8 — about 1.7 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 36 | 36 | 38 | 43 | 55 | 68 | 71 | 67 | 57 | 47 | 42 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Refreshing | Cool | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 36 | Bracing |
| Mar | 36 | Bracing |
| Apr | 38 | Bracing |
| May | 43 | Bracing |
| Jun | 55 | Bracing |
| Jul | 68 | Refreshing |
| Aug | 71 | Refreshing |
| Sep | 67 | Cool |
| Oct | 57 | Bracing |
| Nov | 47 | Bracing |
| Dec | 42 | Bracing |
UV index in Crystal Lake in Summer
Clear-sky midday UV across summer averages around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Crystal Lake peaks around June 21 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 2 | 4 | 6 | 8 | 9 | 8 | 8 | 6 | 3 | 2 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 2 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 9 | Very high |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 1 | Low |
Air quality in Crystal Lake in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Crystal Lake 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 12 | 15 | 16 | 14 | 15 | 16 | 17 | 16 | 13 | 9 | 10 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Moderate |
| Feb | 15 | Moderate |
| Mar | 16 | Moderate |
| Apr | 14 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 17 | Moderate |
| Aug | 16 | Moderate |
| Sep | 13 | Moderate |
| Oct | 9 | Good |
| Nov | 10 | Good |
| Dec | 11 | Good |
Where is Crystal Lake?
Crystal Lake sits at 42.2°N, 88.3°W, 915 ft above sea level, in United States. The nearest listed city is Lake in the Hills, 4.3 mi away.
Topography around Crystal Lake
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Crystal Lake.
Within 2 miles, the terrain around Crystal Lake has only modest variations in elevation — a maximum elevation change of 171 ft around an average of 906 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 322 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 787 ft.
The land around Crystal Lake is covered by trees (47%) and artificial surfaces (27%) within 2 miles, trees (39%) and grassland (26%) within 10 miles, and cropland (38%) and trees (21%) within 50 miles.
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 Crystal Lake (42.2411°, -88.3162°, elevation 915 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.