Climate and monthly weather forecastArlington Heights, IL
Climate and monthly weather forecast
The climate of Arlington Heights
Located in Illinois, USA, Arlington Heights predominantly experiences a Humid Continental climate, denoted by the Köppen climate classification as Dfa. This classification is characterized by a significant variance in temperatures throughout the year, with generally humid conditions and hot summers.The annual weather cycle in Arlington Heights reveals a broad range of temperatures, with averages ranging from lows of 17.4°F (-8.1°C) in January to highs of 81.1°F (27.3°C) in July. The relative humidity remains quite consistent year-round, averaging between 72 and 82%. The town experiences precipitation in different forms, with rainfall ranging from 1.57" (40mm) in November to 3.46" (88mm) in May, along with snowfall which peaks at 5.71" (145mm) in February.
The region receives an average of 9.5 to 15.2 daylight hours with a remarkable increase in sunshine hours from 3.7 hours in January to as high as 10.1 hours between July and August. A fairly uniform wind flow is maintained year-round with minor fluctuations from 6.4mph (10.3km/h) to 10.1mph (16.3km/h).
A pattern worth noticing is the level of snowfall which decreases remarkably from 5.67" (144mm) in January to 0.08" (2mm) in May. From June to September, the area does not experience any snow. The highest recorded temperature is seen in July and August at 81.1°F (27.3°C) and 80.1°F (26.7°C) respectively.
The best time to visit Arlington Heights
Based on the weather conditions in Arlington Heights, the ideal visiting time would fall between May and September. This period generally strikes a balance between warm temperatures and manageable humidity levels. May, in particular, sees a surge in average daylight hours to 14.6, and sunshine duration extending up to 8.4 hours, creating favourable conditions for outdoor activities and explorations.The worst time to visit Arlington Heights
Considering the rather harsh winter conditions, the months of December through February may be relatively less appealing for visitors. The town experiences low temperatures, with an average low of 17.4°F (-8.1°C) in January, frequent snowfall of up to 5.71" (145mm) in February, and considerably less daylight averaging at only 9.5 hours in January.Spring weather in Arlington Heights
Arlington Heights welcomes Spring with gradually increasing temperatures from 43.9°F (6.6°C) in March to 66.4°F (19.1°C) by May. The season sees ample rainfall, with a peak of 3.46" (88mm) in April and May, fostering a lush green environment. The daylight duration improves significantly, averaging from 12 hours in March to 14.6 hours in May.Summer weather in Arlington Heights
Summers in Arlington Heights are characterized by high temperatures, moderate rain, and plenty of sunshine. The average high temperatures hover between 76.3°F (24.6°C) to 81.1°F (27.3°C) from June through August. The region experiences a well-distributed rainfall averaging around 3" (76mm). The abundance of daylight, peaking at 15.2 hours in June, along with extended hours of sunshine up to 10.1 hours in July and August makes this season an enjoyable time for outdoor activities.Autumn weather in Arlington Heights
Autumn sees a gradual decrease in temperature, moving from 73.2°F (22.9°C) in September to 45.5°F (7.5°C) in November. Rainfall remains consistent around 2" (51mm), and by November, the first signs of snow start to appear. With daylight reducing to 9.8 hours and Sunshine to 5 hours by November, the autumn landscape of Arlington Heights presents an altogether different visual treat for visitors.Winter weather in Arlington Heights
Winter in Arlington Heights brings temperatures down to an average low of 17.4°F (-8.1°C) in January, and frequent snowfall with peaks of 5.67" (144mm) in January and 5.71" (145mm) in February. Despite the cold, the town maintains an average relative humidity of 80 to 82% during this time. The amount of daylight decreases significantly to an average of 9.2 hours in December, making this the coldest season in Arlington Heights.Weather in January
Arlington Heights starts the year shrouded in chill and gloom signifying the grip of winter. The area experiences the lowest mean temperatures with high and low averaging at 27.9°F (-2.3°C) and 17.4°F (-8.1°C) respectively. Weather in January »Weather in February
Despite the slight rise in temperature, February is yet another cold month in Arlington Heights. The pronounceable snowfall of 5.71" (145mm) on an average of 11.9 days cements winter's presence. Skies remain predominantly overcast with a 59% cloud cover. Weather in February »Weather in March
As the clasp of winter weakens, weather transformations become evident in March. Notably, there is a significant temperature jump with highs approaching 43.9°F (6.6°C). Equally noteworthy is the marked descend in snowfall to just 1.61" (41mm) occurring over approximately a week. Weather in March »Weather in April
April brings pleasant weather changes to Arlington Heights as it ushers in Spring. Weather transitions dramatically from frigidity to warmth with temperatures soaring up to a high of 54.7°F (12.6°C). Along with the warmer temperatures, rainfall jumps to its yearly peak of 3.46" (88mm) over 15.3 days. Weather in April »Weather in May
The merry month of May is indicative of the full bloom of Spring in Arlington Heights. Warmth becomes more pronounced with high temperatures clocking in at 66.4°F (19.1°C). Alongside, the precipitation remains relatively high with rainfall of 3.46" (88mm) spread across 16.4 days. Weather in May »Weather in June
June is the gateway to summer in Arlington Heights with high temperatures averaging around 76.3°F (24.6°C). Interestingly, there is no snow in sight, confirming summer’s arrival. Sunshine pours in generously, clocking 15.2 hours of daylight while cloudiness recedes to 35%. Weather in June »Weather in July
Weighing in as the hottest month, July witnesses temperatures peaking at 81.1°F (27.3°C) in Arlington Heights. Corresponding to the rise in mercury, the UV index hits its annual high of 6. This period also registers the highest level of sunshine at 10.1 hours over a 14.9-hour long day. Weather in July »Weather in August
The sweltering weather perseveres through August in Arlington Heights with high temperatures nudging 80.1°F (26.7°C). It is worth noting that the average wind speed is at its lowest of 6.4mph (10.3km/h) this month. Sunshine lucidly blankets the city for 10.1 hours a day within a daylight span of 13.8 hours. Weather in August »Weather in September
With temperatures settling around 73.2°F (22.9°C), September marks the onset of Fall in Arlington Heights. Even though traces of summer linger, the total snowfall increases to 0.1" (3mm). Cloud cover slightly rises to 31% and daylight recesses to 12.5 hours suggesting autumn’s arrival. Weather in September »Weather in October
The full arrival of Fall in Arlington Heights breaches the cold weather with October’s temperatures dipping down to a high of 60.1°F (15.6°C). Bringing along another interesting weather shift, the first notable snowflakes of the year appear with 0.51" (13mm) of snow. Weather in October »Weather in November
By November, Arlington Heights braces for the approach of winter. Temperatures dwindle further to produce a high of just 45.5°F (7.5°C). Alongside the chill, snowfall records an increase to 1.73" (44mm) over an average of 4 days. Weather in November »Weather in December
Concluding the year, December plunges Arlington Heights back into the heart of winter. Leveraging a cold climate with temperatures dropping down to an average high and low of 34.3°F (1.3°C) and 24.8°F (-4°C) respectively. A pattern that mirrors January, snowfall escalates to 3.23" (82mm) deposited over a period of 10.9 snowy days. 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, noted for its average high-temperature of 27.9°F (-2.3°C) and an average low-temperature of 17.4°F (-8.1°C), is considered the coldest month in Arlington Heights.
January and February, with an average relative humidity of 82%, are most humid months.
In Arlington Heights, Illinois, during the entire year, the rain falls for 142.7 days and collects up to 27.91" (709mm) of precipitation.
Months with snowfall in Arlington Heights are January through May, October through December.
Throughout the year, there are 48.8 snowfall days, and 21.02" (534mm) of snow is accumulated.
With an average of 3.7h of sunshine, January has the least sunshine of the year.
February is the month with the most snowfall in Arlington Heights, Illinois. Snow falls for 11.9 days and accumulates 5.71" (145mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Arlington Heights, 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 months with the most rainfall in Arlington Heights, Illinois, are April and May, with an average 3.46" (88mm) of precipitation.
June through September are months without snowfall.
The month with the longest days is June, with an average of 15h and 12min of daylight.
The months with the highest UV index in Arlington Heights are June through August, with an average maximum UV index of 6.
The temperatures in Arlington Heights, Illinois, reach their highest averages in July, with highs of 81.1°F (27.3°C) and lows of 66°F (18.9°C).
The months with the most sunshine are July and August, with an average of 10.1h of sunshine.
October is the least humid month in Arlington Heights, with an average relative humidity of 73%.
The month with the least rainfall in Arlington Heights, Illinois, is November, when the rain falls for 9.1 days and typically collects 1.57" (40mm) of precipitation.
The month with the shortest days in Arlington Heights is December, with an average of 9h and 12min of daylight.
December is the month with the lowest UV index in Arlington Heights, Illinois, with an average maximum UV index of 1.
Average temperature
Arlington Heights, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27.9°F).
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure
Arlington Heights, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"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"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Arlington Heights, IL
- Average wind speed in January:
10.1mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.4mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Arlington Heights, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Arlington Heights, IL
- Average rainfall in January:
1.73" - Average rainfall in February:
1.89" - Average rainfall in March:
1.93" - Average rainfall in April:
3.46" - Average rainfall in May:
3.46" - Average rainfall in June:
3.11"
- Average rainfall in July:
2.4" - Average rainfall in August:
2.32" - Average rainfall in September:
1.89" - Average rainfall in October:
2.48" - Average rainfall in November:
1.57" - Average rainfall in December:
1.65"
The wettest months (with the highest rainfall) are April and May (3.46").
The driest month (with the least rainfall) is November (1.57").
Average rainfall days
Arlington Heights, IL
- Average rainfall days in January:
6.6 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
11.9 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
16.4 days - Average rainfall days in June:
15 days
- Average rainfall days in July:
14.5 days - Average rainfall days in August:
13.6 days - Average rainfall days in September:
12 days - Average rainfall days in October:
13.4 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
9.1 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is February (5.8 days).
Average snowfall
Arlington Heights, IL
- Average snowfall in January:
5.67" - Average snowfall in February:
5.71" - Average snowfall in March:
1.61" - Average snowfall in April:
2.48" - Average snowfall in May:
0.08" - Average snowfall in June:
0"
The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Arlington Heights, IL
- Average snowfall days in January:
13.1 days - Average snowfall days in February:
11.9 days - Average snowfall days in March:
6.6 days - Average snowfall days in April:
1.7 days - Average snowfall days in May:
0.1 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:
0.5 days - Average snowfall days in November:
4 days - Average snowfall days in December:
10.9 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Arlington Heights, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 January:
3h and 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
5h and 54min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 6min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 30min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 0min
The months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Arlington Heights, IL
- Average sunshine days in January:
13.3 days - Average sunshine days in February:
10.3 days - Average sunshine days in March:
13.4 days - Average sunshine days in April:
11.9 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
13.3 days
- Average sunshine days in July:
14.6 days - Average sunshine days in August:
16 days - Average sunshine days in September:
16.2 days - Average sunshine days in October:
15.3 days - Average sunshine days in November:
16.4 days - Average sunshine days in December:
14.5 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is February (10.3 days).
Average UV index
Arlington Heights, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Arlington Heights, IL
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility
Arlington Heights, IL
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
