Climate and monthly weather forecast
Calmar, IA

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The climate of Calmar

Calmar, Iowa, exists within the Dfa predominating climate per the Köppen climate classification. This categorization denotes a humid continental climate that exhibits no dry season and a hot summer. The town experiences a broad range of both temperature and precipitation throughout the year due to its continental location in the Midwest United States.

Throughout the year, Calmar experiences significant variations in temperature, as with many areas with a continental climate. Balmy summer months give way to brutally cold winters, often accompanied by snow. The temperature ranges from a minimum average of 9.7°F (-12.4°C) in January to a maximum average of 78.4°F (25.8°C) in July. Similarly, precipitation patterns shift significantly between seasons, with rainfall fluctuating from a low of 1.1" (28mm) in January to a peak of 5.04" (128mm) in June. Similarly, the humidity follows a similar trend, ranging from a low of 77% in April to a peak of 89% in both January and February.

Snowfall is not unusual in this region. The winter months, particularly from December to February, witness considerable snowfall, ranging from 2.2" (56mm) in November to as high as 5.98" (152mm) in February. The city enjoys around nine to fifteen hours of daylight. The sunniest months are May through August when sunshine lasts for more than eight hours on average. As expected, the winter months see fewer daylight hours, with sunlight lasting between three and five hours.

The best time to visit Calmar

The favourable period to explore Calmar falls between May and September. During this time, the temperatures are warmer, ranging from 65.7°F (18.7°C) to 78.4°F (25.8°C). Additionally, this period registers more extended hours of daylight, providing ample time for sightseers to explore. The summer months, particularly July and August, host the most extended daylight hours of up to 15 hours. Moreover, an average humidity between 81% and 84% make the ambiance more pleasant.

The worst time to visit Calmar

January and February register as the least desirable months to visit due to the harsh winter climate. Temperatures during these months dip drastically, with average lows hitting 9.7°F (-12.4°C) and 12.7°F (-10.7°C) respectively. Snowfall is also a common occurrence, with measures reaching 5.63" (143mm) in January and 5.98" (152mm) in February. The extreme cold, coupled with high humidity levels and decreased daylight hours, might discourage tourism during this period.

Spring weather in Calmar

Spring, from March through May, marks a period of transitional weather in Calmar. March begins on a cold note with an average high of 41°F (5°C) but gradually warms up with the temperatures climbing to a comfortable 65.7°F (18.7°C) towards the end of May. Rainfall averages rise gradually from 1.81" (46mm) in March to 4.06" (103mm) in May, marking the inception of the wetter period. From an average of 12 hours of daylight in March, this parameter extends to about 14.7 hours by the end of May.

Summer weather in Calmar

The summer, from June through August, is warm and predominantly wet, with average temperatures scaling between 75°F (23.9°C) and 78.4°F (25.8°C). June is the rainiest month, with precipitation peaking at 5.04" (128mm). Although rainfall declines towards August, the region continues to stay relatively humid with humidity hovering around the 84% mark. Daylight hours remain impressively extensive, providing up to 15.3 hours of sunlight in June.

Autumn weather in Calmar

Autumn months, from September to November, are characterized by a rapid drop in temperatures. While September starts with a pleasant average high of 70.7°F (21.5°C), temperatures decrease to 41.9°F (5.5°C) by November. Rainfall also sees a gradual decrease from 2.48" (63mm) in September to 1.46" (37mm) in November. Notwithstanding the reducing daylight hours, hovering around 9.7 hours by November, the fall colouration in this hemisphere can be an attractive sight for tourists.

Winter weather in Calmar

Winter in Calmar, from December through February, is harsh with average high temperatures remaining below freezing and lows dropping as far as 9.7°F (-12.4°C) in January. Snowfall comes in full swing, particularly in January and February when it reaches up to 5.63 and 5.98" (152mm), respectively. The region becomes biteingly cold, especially when the wind speed, averaging around 10.1mph (16.3km/h), plays its part in lowering the chill factor.

Weather in January

The cold season starts in Calmar, Iowa at the beginning of the New Year with January typically seeing the very lowest thermometer readings with the high being 22.3°F (-5.4°C) and the low only 9.7°F (-12.4°C). Frequent snowfall can turn the city into a winter wonderland, creating breathtaking scenes. Weather in January »

Weather in February

Following a frigid January, February doesn't offer much relief in Calmar as the cold continues to dominate, but there's a slight upturn in temperatures. Snowfall is common, as winter refuses to slacken its grip on the region. From a meteorological perspective, there is a noticeable increase in sunlight hours, hinting at the longer, brighter days to come in the months ahead. Weather in February »

Weather in March

Transitioning from winter to spring, March in Calmar, Iowa leads to a notable rise in temperatures. As the sun shines for longer and the days get longer, the icy grip of winter starts to loosen. This is a season of change, as the curtains of snowfall gradually give way to rainfall. Weather in March »

Weather in April

April in Calmar witnesses a significant change in weather, with a sharp increase in temperatures and longer daylight hours. The transformation between seasons is clearly visible, as the surroundings continue to lush with the arrival of spring. Weather in April »

Weather in May

May in Calmar marks the complete transition into spring, displaying an abundant display of flora and fauna. It's a relatively wet month with precipitation peaking at 4.06" (103mm). Rain showers become abundant, leading to vibrant and lush surroundings. Weather in May »

Weather in June

As June arrives, Calmar welcomes the warm season, with temperatures beginning to climb. The extended daylight hours mark the onset of summer, inviting more people to venture outdoors. The vibrantly lush landscape is in full bloom, adorning the city with a riot of colors. Weather in June »

Weather in July

Hot and sun-drenched would accurately describe July in Calmar, Iowa as the temperatures reach their peak for the year with highs of 78.4°F (25.8°C). This is the warmest period, with summer in its zenith and the city bathed in abundant sunshine. Weather in July »

Weather in August

August sees a continuation of the summer weather with high temperatures and ample sunshine, but there's a mild decline from the peak of July. While the heat can still be intense, there's a perceptible change in the air as summer slowly starts to wind down. Weather in August »

Weather in September

The conditions in September in Calmar take a gradual turn from heated summer days to milder autumn temperatures. It retains the warmth of the summer, but the intense heat starts loosening its grip. The landscape undergoes a transformation as leaves start exhibiting hues from a vast palette of red, orange, yellow, brown. Weather in September »

Weather in October

October offers a mix of autumnal crispness and lingering warmth in Calmar, making it a delight for those who love the fall season. The landscape dons an array of eye-catching fall colors, creating a painting-esque view of the city. Weather in October »

Weather in November

Winter slowly starts to creep in during November in Calmar, with temperatures taking a significant dip. The landscape begins its transformation from the fiery hues of fall to the icy white of winter. The first flurries of snow often turn up, giving a prelude to the impending winter season. Weather in November »

Weather in December

December in Calmar is characterized by a full-fledged winter with temperatures averaging between 28.4°F (-2°C) and 18.3°F (-7.6°C). It's a time when the town is adorned with festive lights and decorations, offering a magical atmosphere despite the cold. Weather in December »
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Frequently asked questions

What is the coldest time of year in Calmar?

The coldest period in Calmar, Iowa, tends to be January, when average temperatures fluctuate between a high of 22.3°F (-5.4°C) and a low of 9.7°F (-12.4°C).

What is the most humid month in Calmar?

January and February, with an average relative humidity of 89%, are most humid months in Calmar, Iowa.

What is the driest month in Calmar?

January is the month with the least rainfall in Calmar. Rain falls for 4.5 days and accumulates 1.1" (28mm) of precipitation.

How many days does it rain in Calmar?

In Calmar, during the entire year, the rain falls for 149 days and collects up to 30.59" (777mm) of precipitation.

When does it snow in Calmar?

January through May, October through December are months with snowfall in Calmar.

How many days does it snow in Calmar?

In Calmar, during the entire year, snow falls for 60.9 days and aggregates up to 24.37" (619mm) of snow.

What is the month with the least sunshine in Calmar?

The month with the least sunshine in Calmar is January, with an average of 3.5h of sunshine.

When is the lowest UV index in Calmar?

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index.

When does it snow the most in Calmar?

February is the month with the most snowfall in Calmar. Snow falls for 12.8 days and accumulates 5.98" (152mm) of snow.

When is Daylight Saving Time (DST) in Calmar?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Calmar, 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.

What are the months with the highest UV index in Calmar?

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

What is the wettest month in Calmar?

June is the month with the most rainfall. Rain falls for 20.3 days and accumulates 5.04" (128mm) of precipitation.

When it does not snow in Calmar?

June through September are months without snowfall in Calmar, Iowa.

When are the longest days in Calmar?

With an average of 15h and 18min of daylight, June has the longest days of the year in Calmar, Iowa.

What is the warmest month in Calmar?

Calmar, Iowa, registers the average highest temperatures during July, with peaks of 78.4°F (25.8°C) and lows of 61.9°F (16.6°C).

What month has the most sunshine in Calmar?

The month with the most sunshine in Calmar, Iowa, is August, with an average of 9.8h of sunshine.

What is the least humid month in Calmar?

With an average relative humidity of 76%, October is the least humid month in Calmar, Iowa.

What is the month with the shortest days in Calmar?

December has the shortest days of the year in Calmar, Iowa, with an average of 9h and 0min of daylight.

Average pressure
Calmar, IA

Average pressure - Calmar, IA

The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

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Average wind speed
Calmar, IA

Average wind speed - Calmar, IA

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7mph).

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Average humidity
Calmar, IA

Average humidity - Calmar, IA

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is October (76%).

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Average rainfall
Calmar, IA

Average rainfall - Calmar, IA

The wettest month (with the highest rainfall) is June (5.04").
The driest month (with the least rainfall) is January (1.1").

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Average rainfall days
Calmar, IA

Average rainfall days - Calmar, IA

The months with the highest number of rainy days are May and June (20.3 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall
Calmar, IA

Average snowfall - Calmar, IA

The month with the highest snowfall is February (5.98").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Calmar, IA

Average snowfall days - Calmar, IA

The month with the highest number of snowfall days is January (14.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Calmar, IA

Average daylight / Average sunshine - Calmar, IA

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).

The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

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Average sunshine days
Calmar, IA

Average sunshine days - Calmar, IA

The month with the most sunshine days is November (16.2 days).
The month with the least sunshine days is June (7.1 days).

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Average UV index
Calmar, IA

Average UV index - Calmar, IA

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, February, November and December (UV index 1).

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Average visibility
Calmar, IA

Average visibility - Calmar, IA

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

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Calmar, Iowa, USA

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