Climate and monthly weather forecastWaterloo, IA
Climate and monthly weather forecast
The climate of Waterloo
Waterloo is a city situated in northeastern Iowa. Its weather is governed by its geographical position and falls under the Dfa category of the Köppen climate classification, denoting humid continental conditions with no dry season and hot summers. This classification translates into varying weather conditions throughout the year, with significant changes across seasons in the key climatic parameters.Looking at the temperatures, the warmest month in Waterloo generally is July, when highs reach an average of 80.1°F (26.7°C), while the lowest temperatures are seen in January with an average low of 12°F (-11.1°C). The city witnesses seasonal fluctuations in humidity too, with the most humid month being January (87% relative humidity) and the least humid being April (73% relative humidity).
Apart from temperature and humidity, precipitation is another vital weather element in this region. Highest average rainfall occurs in May and June with 4.21in and 4.29in respectively. Conversely, least rainfall can be noticed in January and February with an average of 1.02in. June seems to hold the supremacy in terms of rainfall days, recording approximately 18.1 days of rainfall uptick.
It is important to note that Waterloo also gets its share of snowfall. Snowfall typically occurs from late October through early April, with the most snowfall recorded in January (4.21in) and December comes second (2.8in).
The best time to visit Waterloo
Considering the various weather parameters, the best time to visit Waterloo would ideally be between May and September. This period marks the warm season with pleasant temperatures ranging from 56.8°F (13.8°C) to 78.6°F (25.9°C). The rainfall during this period is scattered and usually does not disrupt outdoor activities. Furthermore, the city basks in the sunlight for approximately 9.5h to 9.7h per day, making it perfect for sightseeing and other outdoor pursuits.The worst time to visit Waterloo
The months from December to February could be construed as the worst time to visit Waterloo. During this period, the city experiences its coldest weather with average low temperatures dropping down to 12°F (-11.1°C) and maximums barely reaching 28.4°F (-2°C). Besides, significant snowfall occurs during these months, recording up to 4.21in in January. Traveling conditions could be hindered due to heavy snow and icy roads.Spring weather in Waterloo
Spring in Waterloo is characterized by a slow yet steady rise in temperatures. During this season, average highs range from 44.1°F (6.7°C) in March to 68.2°F (20.1°C) in May, while lows migrate from a chilly 29.7°F (-1.3°C) to a more comfortable 51.6°F (10.9°C) in the same period. March and April bring moderate rainfall with an average of 1.73in and 3.19in respectively, while May witnesses the peak with 4.21in.Summer weather in Waterloo
Summers in Waterloo, encompassing June through August, are typically warm and humid. The mercury hovers between an average high of 77.7°F (25.4°C) in June and 78.6°F (25.9°C) in August. Minimum temperatures during this season are quite pleasant, fluctuating between 61.3°F (16.3°C) to 63.1°F (17.3°C). Despite the high temperatures, the city has an ample amount of rain with June being the wettest month (4.29in) of the year.Autumn weather in Waterloo
Autumn in Waterloo brings a significant drop in temperatures, particularly between September and November. Maximum temperatures drop from 73.2°F (22.9°C) in September to 44.1°F (6.7°C) in November, while average lows plunge from 54.5°F (12.5°C) to a chilly 31.1°F (-0.5°C) in the same period. This season also sees a moderate decrease in rainfall with November being the driest (1.54in).Winter weather in Waterloo
Winter in Waterloo is characterized by cold temperatures and snowfall. December to February sees average highs range from 31.1°F (-0.5°C) to 24.3°F (-4.3°C) while the corresponding lows grapple between 20.5°F (-6.4°C) to 12°F (-11.1°C). Both January and February host a substantial average snowfall of 4.21in and 4.17in respectively, contributing to challenging road conditions and providing scenic white landscapes.Weather in January
Iowa residents all know that January in Waterloo is defined by snowfall and cold temperatures. Snow blankets the city while the wind blows the white, icy powder around. This month experiences the coldest temperatures, with the high barely reaching 24.3°F (-4.3°C) and the low plummeting to 12°F (-11.1°C). Weather in January »Weather in February
February brings slightly warmer temperatures to Waterloo. While it is still the height of winter, the worst of the year's cold is typically in the rearview mirror. Although snowfall and cold temperatures persist, they are less intense compared to the previous month. Weather in February »Weather in March
As winter fades and spring emerges, March experiences a noticeable increase in temperature, presenting more opportunity for outdoor activities. The city beholds a significant reduction in snowfall and an increase in rainfall, indicating the commencement of the spring melting period. Weather in March »Weather in April
By the time April arrives in Waterloo, the city is under the full influence of spring. Flowering trees and shrubs are welcoming additional sunlight and warmer temperatures each day. Rainfall is more frequent in April than in the previous month, which contributes to the vibrancy of awakening plant life. Weather in April »Weather in May
In May, Waterloo leaves behind the freshness of the spring season and transitions into the first hints of summer warmth. A significant increase in the average high and low temperatures means that residents spend more time outdoors. Weather in May »Weather in June
Waterloo experiences mild and pleasant weather through much of June. The shift into summer is unmistakable as abundant sunshine graces the city. The skyline is typically clear, with cloud coverage at its lowest of the year. While high temperatures average a comfortable 77.7°F (25.4°C), the amount of relative humidity begins to rise, paving the way for sultry summer days ahead. Weather in June »Weather in July
July in Waterloo is defined by the peak of summer with the warmest weather of the year. The temperature routinely rises above average with high temperatures reaching an average of 80.1°F (26.7°C). The citizens of Waterloo can spend their days enjoying various outdoor activities due to lengthy daylight hours, despite the relatively high humidity. Weather in July »Weather in August
August sees the continuation of summery weather patterns in Waterloo- warm temperatures, long days, and abundance of sunshine. Nevertheless, compared to July, there's a slight decrease in temperature, offering relief to residents. Weather in August »Weather in September
With the end of summer, September in Waterloo comes with more moderate temperatures and the first hints of fall. An unmistakable onset of the autumn season is experienced this month as the landscape begins to transform. The average high temperature drops to 73.2°F (22.9°C), a noticeable decrease from August. Weather in September »Weather in October
October in Waterloo signals the full arrival of fall with a clear drop in temperature and the foliage's vibrant colors. The city witnesses a surge in wind speed, averaging 9.8mph (15.8km/h) along with a reduction in average high temperatures which dip to 58.5°F (14.7°C). Weather in October »Weather in November
November in Waterloo introduces the upcoming winter with a sharp decline in temperature. Despite the cold, clear days with vibrant sunshine are quite usual. The first snowflakes may start to appear, setting the stage for the winter wonderland that ensues. Weather in November »Weather in December
As the year wraps up, December in Waterloo is characterized by winter's full onset, with snowfall and chilly temperatures being the norm. The holidays bring a magical touch to the snow-covered city, enhancing its charm. The lowest high temperatures of the year occur in December, with an average high of 31.1°F (-0.5°C). 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
With average temperatures fluctuating between a high of 24.3°F (-4.3°C) and a low of 12°F (-11.1°C), January stands out as the coldest month.
The most humid month is January, with an average relative humidity of 87%.
The months with the least rainfall in Waterloo, Iowa, are January and February Rain falls for 4.1 days and accumulates 1.02" (26mm) of rain.
Throughout the year, in Waterloo, there are 133.6 rainfall days, and 28.27" (718mm) of precipitation is accumulated.
Months with snowfall are January through May, October through December.
The month with the most snowfall is January, when snow falls for 11.5 days and typically aggregates up to 4.21" (107mm) of snow.
Throughout the year, there are 41.6 snowfall days, and 15.24" (387mm) of snow is accumulated.
With an average of 3.8h of sunshine, January has the least sunshine of the year.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Waterloo, Iowa, 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 Waterloo is June, when the rain falls for 18.1 days and typically aggregates up to 4.29" (109mm) of precipitation.
June through September are months without snowfall in Waterloo.
June has the longest days of the year in Waterloo, with an average of 15h and 12min of daylight.
With an average maximum UV index of 6, June is the month with the highest UV index in Waterloo, Iowa.
July is the warmest month in Waterloo, Iowa, exhibiting average temperatures of 80.1°F (26.7°C) at the peak and 63.1°F (17.3°C) at the base.
With an average of 9.9h of sunshine, July has the most sunshine of the year.
October is the least humid month in Waterloo, with an average relative humidity of 72%.
December has the shortest days of the year in Waterloo, with an average of 9h and 6min of daylight.
With an average maximum UV index of 1, December is the month with the lowest UV index in Waterloo.
Average temperature
Waterloo, IA
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (24.3°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 (12°F).
Average pressure
Waterloo, IA
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.13"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.89"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.08"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 (29.89"Hg).
Average wind speed
Waterloo, IA
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.8mph - Average wind speed in May:
9.3mph - Average wind speed in June:
8.1mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
7mph - Average wind speed in September:
8.2mph - Average wind speed in October:
9.8mph - Average wind speed in November:
10.4mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity
Waterloo, IA
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Waterloo, IA
- Average rainfall in January:
1.02" - Average rainfall in February:
1.02" - Average rainfall in March:
1.73" - Average rainfall in April:
3.19" - Average rainfall in May:
4.21" - Average rainfall in June:
4.29"
- Average rainfall in July:
2.95" - Average rainfall in August:
1.97" - Average rainfall in September:
2.48" - Average rainfall in October:
2.52" - Average rainfall in November:
1.54" - Average rainfall in December:
1.34"
The wettest month (with the highest rainfall) is June (4.29").
The driest months (with the least rainfall) are January and February (1.02").
Average rainfall days
Waterloo, IA
- Average rainfall days in January:
4.1 days - Average rainfall days in February:
4 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
14.6 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
18.1 days
- Average rainfall days in July:
15.3 days - Average rainfall days in August:
13.3 days - Average rainfall days in September:
11.2 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
5.8 days
The month with the highest number of rainy days is June (18.1 days).
The month with the least rainy days is February (4 days).
Average snowfall
Waterloo, IA
- Average snowfall in January:
4.21" - Average snowfall in February:
4.17" - Average snowfall in March:
1.61" - Average snowfall in April:
0.75" - Average snowfall in May:
0.2" - Average snowfall in June:
0"
The month with the highest snowfall is January (4.21").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Waterloo, IA
- Average snowfall days in January:
11.5 days - Average snowfall days in February:
9.9 days - Average snowfall days in March:
5.2 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0.3 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:
0.7 days - Average snowfall days in November:
3.3 days - Average snowfall days in December:
8.9 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Waterloo, IA
- 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 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
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 6min).
- Average sunshine in January:
3h and 48min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
9h and 54min - Average sunshine in August:
9h and 42min - Average sunshine in September:
9h and 6min - Average sunshine in October:
5h and 24min - Average sunshine in November:
5h and 12min - Average sunshine in December:
4h and 18min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Waterloo, IA
- Average sunshine days in January:
16.1 days - Average sunshine days in February:
14.3 days - Average sunshine days in March:
15.1 days - Average sunshine days in April:
12.4 days - Average sunshine days in May:
12.8 days - Average sunshine days in June:
10 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
15.8 days - Average sunshine days in September:
16.5 days - Average sunshine days in October:
17.8 days - Average sunshine days in November:
17.6 days - Average sunshine days in December:
17.7 days
The month with the most sunshine days is October (17.8 days).
The month with the least sunshine days is June (10 days).
Average UV index
Waterloo, IA
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Waterloo, IA
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Waterloo, IA
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).
