Crystal Lake, Iowa Weather
Lesser ripening, greater heat. Day 89 of spring. Read this microseason across nine climate regions →
Crystal Lake weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Overcast15%—72°55°—
- WednesdayJun 17Thunderstorm61%0.24″77°56°+5°
- ThursdayJun 18Drizzle13%—70°55°-7°
- FridayJun 19Drizzle10%—74°49°+4°
- SaturdayJun 20Rain32%0.30″62°55°-12°
- SundayJun 21Light Drizzle49%—62°54°0°
- MondayJun 22Overcast27%—69°50°+7°
AQI 33 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 41 now. With UV 7.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 43 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 41 now. With UV 7.9 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 43 around 1 PM.
- Present
- AQI 41
- UV peak
- 7.9 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 43
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 6:46 AM
- Moonset
- 10:17 PM
- In sign
- ♋︎ Cancer
Lesser ripening, greater heat
Crystal Lake at a glance
- Today vs. normal: 4°F below the seasonal normal for this latitude
- Last frost: May 5 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Crystal Lake
- Tue72°55°15%
- Wed77°56°61%
- Thu70°55°13%
- Fri74°49°10%
- Sat62°55°32%
- Sun62°54°49%
- Mon69°50°27%
- Tue71°60°12%
- Wed79°58°15%
- Thu82°63°27%
- Fri85°66°27%
- Sat89°68°25%
- Sun88°74°42%
- Mon87°71°43%
- Tue91°74°46%
- Wed90°74°30%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 16, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Crystal Lake
SPC has placed Crystal Lake in the Marginal Risk category for severe thunderstorms today.
- TODAYMRGLMarginal Risk
- TOMORROWMRGLMarginal Risk
- DAY 3NONENo severe risk
Isolated severe storms possible. Limited threat for hail or damaging wind.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Crystal Lake
- 50432