Climate and monthly weather forecastNormal, IL
Climate and monthly weather forecast
The climate of Normal
Normal, located in Illinois, USA, is categorized as a Dfa zone according to the Köppen climate classification. This designation corresponds to a humid continental climate, marked by no dry season and hot summers. A thorough examination reveals a climate experiencing dynamic weather patterns over the twelve months.Throughout the year, temperatures oscillate drastically, with January holding the lowest average temperature of 18.9°F (-7.3°C) and July offering the highest average temperatures of up to 80.8°F (27.1°C). Relative humidity ranges from 71% in October to 85% in July, indicating a rather humid climate all year round. Visibility remains consistent year-round, with an average of 6 miles in most months, except in July and August where it dips to 5 miles.
Normal has distinctly wet characteristics, receiving rainfall every month, with the quantity varying from 1.18" (30mm) in January to a maximum of 2.99" (76mm) in May. The number of rainfall days fluctuates from 5.3 in February to 17.8 in July. As expected for a humid continental climate, snowfall has a seasonal pattern, mainly from December to March, with the highest averages of 2.44" (62mm) in January and 1.65" (42mm) in December.
The daylight duration varies with the seasonal cycle, stretching from 9.7 hours in January to a maximum of 15 hours in June. Correspondingly, the sunshine hours show an inverse pattern, with the least sunshine hours of 3.6 in January extending to a maximum of 9.7 in June.
The Best Time to Visit Normal
The most favorable time to plan a visit to Normal would be during the late spring and early summer months, from May to June. During this period, the weather is mild and agreeable with average high temperatures rising from 72°F (22.2°C) to 79.3°F (26.3°C). The hours of daylight are also at their peak, averaging between 14.5 and 15 hours, providing ample sunlight for outdoor activities.The Worst Time to Visit Normal
On the opposite side of the spectrum, the chilly winter months from December to February are less inviting for travelers. The temperature averages are at their lowest, with highs only reaching between 30.7°F (-0.7°C) and 35.6°F (2°C) and lows dipping between 18.9°F (-7.3°C) and 22.3°F (-5.4°C). Additionally, the daylight hours during winter are shortest, ranging from 9.3 to 10.7 hours only.Spring Weather in Normal
Spring is a season of transition in Normal, with temperatures warming up gradually from 48.7°F (9.3°C) in March to 72°F (22.2°C) in May. While rainfall sees a consistent increase from 1.65" (42mm) in March to a high of 2.99" (76mm) in May, snowfall completely disappears after March. The lengthening daylight from 12 hours in March to 14.5 hours in May makes it an agreeable season for outdoor enjoyment.Summer Weather in Normal
Summers in Normal come with typically hot temperatures, rising as high as 79.3°F (26.3°C) in June and peaking at 80.8°F (27.1°C) in July. Though rainfall persists, it slightly tones down to 2.64" (67mm) in June and 2.32" (59mm) in July. Daylight is generously available during this season, with up to 15 hours in June.Autumn Weather in Normal
The autumn season sees a retreat in the high temperatures of summer, dipping from 75.7°F (24.3°C) in September to 47.7°F (8.7°C) in November. Rainfall also sees a decrease, from 1.89" (48mm) in October down to 1.42" (36mm) in November. However, the daylight hours begin to decrease at this time, dropping from 11.1 hours in October down to 9.9 hours in November.Winter Weather in Normal
Winter in Normal is characterized by cold temperatures, averaging 30.7°F (-0.7°C) in December and reaching the annual minimum of 18.9°F (-7.3°C) in January. Snowfall is also at its height during this season, particularly in December and January with averages of 1.65" (42mm) and 2.44" (62mm), respectively. Daylight hours are at their shortest, sinking to 9.7 in December and remaining as low as 9.3 in January. The combination of cold weather, snowfall, and short daylight hours makes this season less favorable for travel and outdoor activities.Weather in January
January in Normal, Illinois, USA, is characterized by a cold temperate climate. The month typically experiences extremes in temperature, from a high of 30.7°F (-0.7°C) to a low of 18.9°F (-7.3°C). Snowfall, while prevalent, is not excessive, with the city usually receiving no more than 2.44" (62mm). Weather in January »Weather in February
Moving into February, the weather gradually starts to transition. Temperatures inch upwards slightly, which hints at the advancing spring. However, it should be noted that February is still much colder than the following months. Weather in February »Weather in March
As March enters, Normal begins to wave goodbye to the harsh winter. While still lower than spring and summer levels, the average temperature climbs significantly from the winter months. Sharp declines in snowfall rates are observed, cascading down to just 1.26" (32mm). Weather in March »Weather in April
By April, Normal has largely shrugged off the vestiges of winter. Weather patterns shift towards increased rainfall, reaching 2.4" (61mm), signaling spring's arrival. The city basks in the glory of noticeably longer daylight hours, typically up to roughly 13.3 hours. Weather in April »Weather in May
May is a key player in Normal's spring scene, guiding the city towards summer. As the city warms, temperatures rise considerably, supporting the growth of flora. A notable jump in rainfall to 2.99" (76mm) provides increased hydration for the blooming plant life. Weather in May »Weather in June
Weather in June marks the arrival of summer, a season cherished by many in Normal. The city becomes a sun worshipper’s paradise, offering extended daylight hours and more hours of direct sunshine each day. Notably, June's climate is characterized by an increase in relative humidity, indicating the prevalence of warm and muggy conditions. Weather in June »Weather in July
July often stands as the peak of summer in Normal, boasting the highest monthly average temperatures and humidity. A sharp decrease in wind speeds below 7mph (11.3km/h) offers relatively windless days, further amplifying the summer heat. Weather in July »Weather in August
August brings the final full month of summer to Normal. Despite some slight changes in certain weather parameters, the overall summer trend prevails, with high temperatures and intense sunlight. Relative humidity remains elevated from the hotter months, maintaining the typical muggy summer conditions. Weather in August »Weather in September
September in Normal spins the weather dial back towards milder conditions, heralding the onset of autumn. A notable dip in average temperatures signals the departure of the hotter summer months. Rainfall decreases to 1.5" (38mm), marking the gradual close of the summer season. Weather in September »Weather in October
Arriving in October, the city of Normal is well on its way into autumn. The change in season become noticeable with falling temperatures and increased cloud cover. October's climate tends to be much more stable than September's, offering consistent meteorological conditions rather than sudden changes. Weather in October »Weather in November
November shifts Normal's weather pattern, nudging the city towards colder days. The city experiences a tangible drop in temperature, raising the anticipation of early snowfall. November marks the first reappearance of snow after summer, albeit a modest 1.18" (30mm). Weather in November »Weather in December
December in Normal signals the full swing of winter, as evidenced by plummeting temperatures and increased snowfall of 1.65" (42mm). This period is characterized by shorter days and longer nights, typical of the winter months. Weather in December »Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, having an average high-temperature of 30.7°F (-0.7°C) and an average low-temperature of 18.9°F (-7.3°C), is the coldest month in Normal.
January is the month with the least rainfall. Rain falls for 5.6 days and accumulates 1.18" (30mm) of precipitation.
Throughout the year, in Normal, Illinois, there are 140.6 rainfall days, and 22.44" (570mm) of precipitation is accumulated.
Months with snowfall are January through April, October through December.
The month with the most snowfall in Normal is January, when snow falls for 11.5 days and typically aggregates up to 2.44" (62mm) of snow.
In Normal, during the entire year, snow falls for 35.4 days and aggregates up to 9.45" (240mm) of snow.
January has the least sunshine of the year in Normal, Illinois, with an average of 3.6h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
The month with the most rainfall in Normal, Illinois, is May, when the rain falls for 17.5 days and typically aggregates up to 2.99" (76mm) of precipitation.
In Normal, snow does not fall in May through September.
June has the longest days of the year, with an average of 15h and 0min of daylight.
With an average of 9.7h of sunshine, June has the most sunshine of the year in Normal, Illinois.
June through August, with an average maximum UV index of 6, are months with the highest UV index.
In Normal, the average highest temperatures are observed in July, with a high of 80.8°F (27.1°C) and a low of 64.6°F (18.1°C).
With an average relative humidity of 85%, July is the most humid month in Normal.
The least humid month in Normal is October, with an average relative humidity of 71%.
With an average of 9h and 18min of daylight, December has the shortest days of the year.
Average temperature
Normal, IL
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.7°F).
The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Normal, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Normal, IL
- Average wind speed in January:
11.1mph - Average wind speed in February:
10.9mph - Average wind speed in March:
10.7mph - Average wind speed in April:
11mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.8mph - Average wind speed in November:
10.6mph - Average wind speed in December:
10.5mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Normal, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Normal, IL
- Average rainfall in January:
1.18" - Average rainfall in February:
1.22" - Average rainfall in March:
1.65" - Average rainfall in April:
2.4" - Average rainfall in May:
2.99" - Average rainfall in June:
2.64"
- Average rainfall in July:
2.32" - Average rainfall in August:
2.01" - Average rainfall in September:
1.5" - Average rainfall in October:
1.89" - Average rainfall in November:
1.42" - Average rainfall in December:
1.22"
The wettest month (with the highest rainfall) is May (2.99").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days
Normal, IL
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
5.3 days - Average rainfall days in March:
11.3 days - Average rainfall days in April:
14.6 days - Average rainfall days in May:
17.5 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
14.1 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
10.8 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
7.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is February (5.3 days).
Average snowfall
Normal, IL
The month with the highest snowfall is January (2.44").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Normal, IL
- Average snowfall days in January:
11.5 days - Average snowfall days in February:
7.8 days - Average snowfall days in March:
4.2 days - Average snowfall days in April:
1 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
8 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Normal, IL
- Average daylight in January:
9h and 42min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 0min
- Average daylight in July:
14h and 42min - Average daylight in August:
13h and 42min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
3h and 36min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 36min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
9h and 24min - Average sunshine in August:
9h and 30min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 48min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Normal, IL
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
14.3 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
12.8 days - Average sunshine days in May:
11.1 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
9.7 days - Average sunshine days in August:
12.8 days - Average sunshine days in September:
15 days - Average sunshine days in October:
17.4 days - Average sunshine days in November:
18.4 days - Average sunshine days in December:
16.6 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (9.7 days).
Average UV index
Normal, IL
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, November and December (UV index 2).
Average cloud cover
Normal, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility
Normal, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
