May weather forecast
Rochelle, IL

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Weather in May

The last month of the spring, May, is an agreeable month in Rochelle, Illinois, with an average temperature fluctuating between 52°F (11.1°C) and 68.9°F (20.5°C).

Temperature

Rochelle sees an increase in the average high-temperature with the arrival of May, moving from April's mild 56.8°F (13.8°C) to a pleasant 68.9°F (20.5°C). Rochelle's temperature in May lowers to a consistent average of 52°F (11.1°C) during the nights.

Humidity

In Rochelle, the average relative humidity in May is 77%.

Rainfall

In Rochelle, during May, the rain falls for 15.5 days and regularly aggregates up to 2.09" (53mm) of precipitation. Throughout the year, there are 124.5 rainfall days, and 14.49" (368mm) of precipitation is accumulated.

Snowfall

In Rochelle, snow does not fall in May through September.

Daylight

In Rochelle, the average length of the day in May is 14h and 35min.
On the first day of the month, sunrise is at 5:51 am and sunset at 7:55 pm. On the last day of May, sunrise is at 5:23 am and sunset at 8:24 pm CDT.

Sunshine

In May, the average sunshine in Rochelle is 8.3h.

UV index

The months with the highest UV index in Rochelle are May through August, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: An average UV index of 5 in May transforms into this advice:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in Rochelle in May?

In Rochelle, 68.9°F (20.5°C) is the average high-temperature and 52°F (11.1°C) is the average low-temperature during May.

What is the average humidity in May in Rochelle?

In May, the average relative humidity in Rochelle is 77%.

How many days does it rain in May in Rochelle?

In Rochelle, Illinois, in May, during 15.5 rainfall days, 2.09" (53mm) of precipitation is typically accumulated.

When it does not snow in Rochelle?

In Rochelle, Illinois, snow does not fall in May through September.

Does it snow in Rochelle in May?

In May, in Rochelle, Illinois, it doesn't snow. April is the latest month when it typically snows.

What is the average length of the day in May in Rochelle?

The average day length in May in Rochelle is 14h and 35min.

When is the sunrise / sunset in May in Rochelle?

On the first day of May, sunrise is at 5:51 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:24 pm CDT.

How long on average sun shines in May in Rochelle?

The average sunshine duration in May in Rochelle, Illinois, is 8.3h.

When is the highest UV index in Rochelle?

May through August, with an average maximum UV index of 5, are months with the highest UV index in Rochelle, Illinois.

What is the UV index intensity in May in Rochelle?

The average daily maximum UV index in May in Rochelle, Illinois, is 5. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Rochelle, IL

Average temperature in May - Rochelle, IL
  • Average high temperature in May: 68.9°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in May: 52°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).

Average pressure in May
Rochelle, IL

Average pressure in May - Rochelle, IL
  • Average pressure in May: 29.96"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in May
Rochelle, IL

Average wind speed in May - Rochelle, IL
  • Average wind speed in May: 8.7mph

The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in May
Rochelle, IL

Average humidity in May - Rochelle, IL
  • Average humidity in May: 77%

The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (74%).

Average rainfall in May
Rochelle, IL

Average rainfall in May - Rochelle, IL
  • Average rainfall in May: 2.09"

The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is February (0.55").

Average rainfall days in May
Rochelle, IL

Average rainfall days in May - Rochelle, IL
  • Average rainfall days in May: 15.5 days

The month with the highest number of rainy days is June (16 days).
The month with the least rainy days is February (3.8 days).

Average snowfall in May
Rochelle, IL

Average snowfall in May - Rochelle, IL
  • Average snowfall in May: 0"

The month with the highest snowfall is January (2.2").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in May
Rochelle, IL

Average snowfall days in May - Rochelle, IL
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in May /
Average sunshine in May
Rochelle, IL

Average daylight in May / Average sunshine in May - Rochelle, IL
  • Average daylight in May: 14h and 4min

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 May: 8h and 2min

The month with the most sunshine is June (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in May
Rochelle, IL

Average sunshine days in May - Rochelle, IL
  • Average sunshine days in May: 13.3 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.9 days).

Average UV index in May
Rochelle, IL

Average UV index in May - Rochelle, IL
  • Average UV index in May: 5

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in May
Rochelle, IL

Average cloud cover in May - Rochelle, IL
  • Average cloud cover in May: 44

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).

Average visibility in May
Rochelle, IL

Average visibility in May - Rochelle, IL
  • Average visibility in May: 6mi

The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).

Rochelle, Illinois, USA

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