Climate and monthly weather forecast
Chesterfield, MO

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The climate of Chesterfield

Chesterfield, Missouri, United States, experiences a predominate Humid subtropical climate devoid of a dry season, evident by the Köppen climate classification "Cfa". The town is subject to a myriad of different weather conditions affected by geographical position and time of the year.

Throughout the year, the weather parameters exhibit considerable variations. High temperatures range from as low as 37.8°F (3.2°C) in the winter months to a sweltering 87.4°F (30.8°C) in the summer. At the same time, lows vary from a chill 24.1°F (-4.4°C) to a mild 68.5°F (20.3°C). The region's relative humidity levels remain constant, staying within a narrow band, ranging from a low of 71% to a peak of 78%.

Chesterfield experiences rainfall throughout the year, with accumulations ranging from 0.04" (1mm) in the drier months of February to a high of 0.12" (3mm), usually in May. Interestingly, the number of rainy days per month increases from February's 6.9 days to reach a peak of 16.3 days in May and then drops consistently, reaching its lowest level of 7.2 days in December. Snowfall occurs mostly between the months of January and March, and again in December. However, the amount of snow is less than 1.69" (43mm) even during these months.

The best time to visit Chesterfield

June to August marks the best time to visit Chesterfield, Missouri. These months bring about the highest average temperatures, reaching up to 87.4°F (30.8°C), and relative humidity levels are at a comfortable range of 76% to 78%. Additionally, the sunshine hours are at their peak, averaging 10.5 hours per day. Consequently, these conditions provide the ideal weather for outdoor activities and sightseeing, ensuring visitors have the best experience.

The worst time to visit Chesterfield

Winter months, notably January and February, are considered the least ideal time for a leisure trip to Chesterfield. During these months, temperatures fluctuate between a chilly 24.1°F (-4.4°C) and a high of 42.4°F (5.8°C). Additionally, these months witness the highest levels of snowfall of the year between 1.42" (36mm) to 1.69" (43mm). These weather conditions can pose challenges for outdoor activities and travel logistics, hence making these months unfavorable for a visit.

Spring weather in Chesterfield

Spring in Chesterfield spans from March to May, featuring a gradual rise in temperature, which goes up from 54.7°F (12.6°C) to 75°F (23.9°C) by May. The period also sees consistent rainfall between 0.08" (2mm) to 0.12" (3mm) per month, and an increase in the number of rainy days from 13.1 in March to 16.3 in May. Even with the moisture, springtime brings more sunlight, escalating from twelve hours per day in March to an impressive fourteen hours in May.

Summer weather in Chesterfield

The summer months from June through August provide Chesterfield with its warmest weather conditions, with average highs from 84.4°F (29.1°C) to 87.4°F (30.8°C). Alongside heat, these months also experience their share of rainfall, averaging slightly below 0.12" (3mm). Nevertheless, the region enjoys its longest daylight hours, exceeding fourteen hours per day, ensuring ample opportunity for outdoor activities.

Autumn weather in Chesterfield

Autumn in Chesterfield, occurring between September and November, reveals a steady decline in temperature from 79.7°F (26.5°C) to a cool 53.6°F (12°C) in November. Rainfall is moderate, ranging from 0.08" (2mm) to 0.08" (2mm), as the number of rainy days gently declines from 12 to 8.4 days. With average daylight hours lasting between ten to twelve hours, Autumn provides a scenic view of falling leaves under relatively clear skies.

Winter weather in Chesterfield

The winter months from December to February in Chesterfield are characterized by cold temperatures, with averages fluctuating between 24.1°F (-4.4°C) to 42.4°F (5.8°C). These months also witness sporadic snowfall, ranging from 0.28" (7mm) to 1.42" (36mm), creating a chilly atmosphere fit for winter lovers and skiing enthusiasts. However, daylight hours are at the shortest with 9.5 hours in December, indicating long, cold winter nights.

Weather in January

Winter sets a chilly stage for the start of the year in Chesterfield, Missouri. The grey cloud cover is reluctant to fade, often blanketing the city with around 49% coverage, and bringing an average snowfall of 1.42" (36mm). This month is also notable for its limited amount of daylight, estimated at around 9.8 hours per day. Weather in January »

Weather in February

Following January, February continues the winter narrative, although signs of change start to appear. The month experiences an increase in daylight to approximately 10.8 hours, and the average high temperature inches up a little. Weather in February »

Weather in March

With the arrival of March, the icy grip of winter starts to loosen on Chesterfield. As the city bids farewell to snow, rainfall registers a remarkable increase from 1.3" (33mm) in February to 1.85" (47mm) in March. Longer hours of daylight and the mild temperature offer a pleasant welcome to spring. Weather in March »

Weather in April

In April, Chesterfield fully leaps into spring. The warming trend accelerates with the average high temperature climbing from 54.7°F (12.6°C) in March to 65.8°F (18.8°C) in April. The city receives more plentiful sunshine, and the frequency and volume of rainfall increase, nurturing the growth of new vegetation. Weather in April »

Weather in May

May is the gateway to the much-awaited arrival of summer in Chesterfield. The city looks more green and fecund with the increased humidity from 75% in April to 78% in May. The inhabitants readily exchange their spring clothing for lighter summer wear. Weather in May »

Weather in June

June marks the full bloom of summer in Chesterfield and is characterized by longer days and a significant rise in temperature. The UV index hits the annual peak of 7, emphasizing the intensity of the June sun. The city gears up for sumptuous barbecues, delightful picnics, and enriching hikes. Weather in June »

Weather in July

The height of summer hits its stride in July with Chesterfield experiencing the highest average temperature of 87.4°F (30.8°C). The weather compels locals and visitors alike to seek relief in the city's pools and nearby water bodies. Weather in July »

Weather in August

After the peak of July, August continues to carry forward the chorus of summer, albeit with slightly less intensity. It remains primarily hot in the city with a temperature transition from the high of July to a slightly milder 86.2°F (30.1°C). Weather in August »

Weather in September

As September rolls in, the weather in Chesterfield undergoes a considerable transformation. The city delegates itself to the arrival of autumn, with the temperature falling from a high of 86.2°F (30.1°C) in August to 79.7°F (26.5°C) in September. Weather in September »

Weather in October

October brings a distinct feel of autumn to Chesterfield as the cooler weather gradually sets in. The city displays a dramatic drop in temperature, transitioning from a high of 79.7°F (26.5°C) in September to 66.4°F (19.1°C) in October. Weather in October »

Weather in November

November steers Chesterfield towards the colder times as winter starts edging in. The onset of the holiday season combines with the dropping temperature which lowers to an average high of 53.6°F (12°C). The fall of red and yellow leaves paves the way for barren trees, indicating the nearing end of autumn. Weather in November »

Weather in December

Winter returns to Chesterfield in December, transforming the cityscape into a colder, quieter place. Snowfall makes a comeback after months of absence, with an average of 1.06" (27mm) falling. The chill in the air, combined with the festive décor adorning houses and shops, adds to the holiday spirit. Weather in December »
Updated: Aug 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What part of the year is the coldest in Chesterfield?

The coldest time of the year is January, with temperatures averaging a high of 37.8°F (3.2°C) and a low of 24.1°F (-4.4°C).

How much does it rain?

In Chesterfield, during the entire year, the rain falls for 139.6 days and collects up to 26.1" (663mm) of precipitation.

When does it snow?

January through March, November and December are months with snowfall.

How many days does it snow?

Throughout the year, there are 18.9 snowfall days, and 4.92" (125mm) of snow is accumulated.

What is the month with the least sunshine?

The month with the least sunshine is January, with an average of 4.7h of sunshine.

When is the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the driest month?

The month with the least rainfall is February, when the rain falls for 6.9 days and typically collects 1.3" (33mm) of precipitation.

What is the snowiest month?

February is the month with the most snowfall. Snow falls for 5.3 days and accumulates 1.69" (43mm) of snow.

When is Daylight Saving Time (DST) in Chesterfield?

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.

When it does not snow?

April through October are months without snowfall.

What is the most humid month?

The most humid month is May, with an average relative humidity of 78%.

What is the rainiest month?

The month with the most rainfall is May, when the rain falls for 16.3 days and typically aggregates up to 3.19" (81mm) of precipitation.

When are the longest days?

June has the longest days of the year, with an average of 14h and 48min of daylight.

When is the highest UV index?

With an average maximum UV index of 7, June is the month with the highest UV index.

What time of the year is the hottest?

July tends to be the warmest month in Chesterfield, with temperatures averaging a daily high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C).

What month has the most sunshine?

With an average of 10.6h of sunshine, July has the most sunshine of the year in Chesterfield.

What is the least humid month in Chesterfield?

The least humid month is October, with an average relative humidity of 71%.

What is the month with the shortest days?

With an average of 9h and 30min of daylight, December has the shortest days of the year.

Average temperature
Chesterfield, MO

Average temperature - Chesterfield, MO

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (37.8°F).

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).

Average pressure
Chesterfield, MO

Average pressure - Chesterfield, MO

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed
Chesterfield, MO

Average wind speed - Chesterfield, MO

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).

Average humidity
Chesterfield, MO

Average humidity - Chesterfield, MO

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).

Average rainfall
Chesterfield, MO

Average rainfall - Chesterfield, MO

The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is February (1.3").

Average rainfall days
Chesterfield, MO

Average rainfall days - Chesterfield, MO

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is January (6.8 days).

Average snowfall
Chesterfield, MO

Average snowfall - Chesterfield, MO

The month with the highest snowfall is February (1.69").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days
Chesterfield, MO

Average snowfall days - Chesterfield, MO

The month with the highest number of snowfall days is January (6.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Chesterfield, MO

Average daylight / Average sunshine - Chesterfield, MO

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days
Chesterfield, MO

Average sunshine days - Chesterfield, MO

The months with the most sunshine days are January and December (20.2 days).
The month with the least sunshine days is June (12 days).

Average UV index
Chesterfield, MO

Average UV index - Chesterfield, MO

The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average visibility
Chesterfield, MO

Average visibility - Chesterfield, MO

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

Chesterfield, Missouri, USA

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