Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The onset of September brings a small shift in high-temperatures, falling from 80.1°F (26.7°C) in August to a still warm 73.4°F (23°C). Throughout the nights in September, an average low-temperature of 54.5°F (12.5°C) is noted in Crystal Lake.Humidity
In Crystal Lake, the average relative humidity in September is 78%.Rainfall
The month with the least rainfall is September, when the rain falls for 7.9 days and typically collects 0.39" (10mm) of precipitation.Snowfall
In Crystal Lake, snow does not fall in June through October.Daylight
In Crystal Lake, the average length of the day in September is 12h and 28min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:22 pm. On the last day of September, in Crystal Lake, Connecticut, sunrise is at 6:46 am and sunset at 6:32 pm EDT.
Sunshine
The average sunshine in September in Crystal Lake is 8.5h.UV index
In Crystal Lake, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum UV index of 4 during September leads to these instructions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Frequently asked questions
What are the temperatures in Crystal Lake in September?
What is the average humidity in September in Crystal Lake?
What is the driest month in Crystal Lake?
How many days does it rain in September in Crystal Lake?
When it does not snow in Crystal Lake?
What is the average length of the day in September in Crystal Lake?
When are sunrise and sunset in September in Crystal Lake?
How long on average sun shines in September in Crystal Lake?
What is the UV index reading in September in Crystal Lake?
Average temperature in September
Crystal Lake, CT
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.4°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in September
Crystal Lake, CT
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Crystal Lake, CT
- Average wind speed in September: 5.8mph
The windiest months (with the highest average wind speed) are January and March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in September
Crystal Lake, CT
- Average humidity in September: 78%
The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).
Average rainfall in September
Crystal Lake, CT
- Average rainfall in September: 0.39"
The wettest months (with the highest rainfall) are May, June and July (1.1").
The driest month (with the least rainfall) is September (0.39").
Average rainfall days in September
Crystal Lake, CT
- Average rainfall days in September: 7.9 days
The month with the highest number of rainy days is June (12.1 days).
The months with the least rainy days are January and February (5.5 days).
Average snowfall in September
Crystal Lake, CT
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Crystal Lake, CT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (6.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Crystal Lake, CT
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 3min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in September
Crystal Lake, CT
- Average sunshine days in September: 19.8 days
The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is June (15.7 days).
Average UV index in September
Crystal Lake, CT
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Crystal Lake, CT
- Average cloud cover in September: 39
The months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Crystal Lake, CT
- Average visibility in September: 5mi
The months with the highest visibility are January, March, April, October, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August and September (5mi).
Crystal Lake, Connecticut, USA
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