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Contents
- The climate of Duncan
- The best time to visit Duncan
- The worst time to visit Duncan
- Spring weather in Duncan
- Summer weather in Duncan
- Autumn weather in Duncan
- Winter weather in Duncan
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Duncan
Duncan is in the Köppen climate classification Cfa zone, which is described as a humid subtropical region with no dry season. Unsurprisingly, this Oklahoma-based city experiences a wide spectrum of weather conditions throughout the annual cycle. These stretch from colder winter months with potential snowfall to swelteringly warm summer months.
Throughout the year, a relatively high level of humidity is observed, with percentages ranging between 55% in August and 73% in May. Rainfall varies greatly, with the highest precipitation occurring in May—4.37" (111mm). Duncan also sees its least rainfall in February, measuring only 1.02" (26mm). It can snow in Duncan, but snowfall occurs mainly in the winter months, peaking in February with 1.3" (33mm).
Temperatures in Duncan can take quite a swing over the year as well, reaching a high of 95°F (35°C) in August and sinking to a low of 33.6°F (0.9°C) in January. Monthly average visibility remains consistent at 6 miles, making it usually easy for residents and visitors alike to enjoy the scenic surrounding areas. Wind speeds in Duncan are relatively steady, fluctuating from 8.3mph (13.4km/h) to 11.6mph (18.7km/h), with maximum speeds recorded between 11.7mph (18.8km/h) and 12.6mph (20.3km/h).
Throughout the year, a relatively high level of humidity is observed, with percentages ranging between 55% in August and 73% in May. Rainfall varies greatly, with the highest precipitation occurring in May—4.37" (111mm). Duncan also sees its least rainfall in February, measuring only 1.02" (26mm). It can snow in Duncan, but snowfall occurs mainly in the winter months, peaking in February with 1.3" (33mm).
Temperatures in Duncan can take quite a swing over the year as well, reaching a high of 95°F (35°C) in August and sinking to a low of 33.6°F (0.9°C) in January. Monthly average visibility remains consistent at 6 miles, making it usually easy for residents and visitors alike to enjoy the scenic surrounding areas. Wind speeds in Duncan are relatively steady, fluctuating from 8.3mph (13.4km/h) to 11.6mph (18.7km/h), with maximum speeds recorded between 11.7mph (18.8km/h) and 12.6mph (20.3km/h).
The best time to visit Duncan
People looking to experience Duncan at its warmest might want to consider visiting between June and August. Temperatures during this period are usually between 79.3°F (26.3°C) and 95°F (35°C), providing conditions perfect for outdoor activities. Relative humidity is comparatively low in these months, from 55% to 67%, which contributes to a comfortable atmosphere. Additionally, sunshine prevails with 10.7 hours to 11.1 hours of sunlight per day.
The worst time to visit Duncan
Duncan's winter months of December to February bear the coldest temperatures, falling between 33.6°F (0.9°C) and 54.3°F (12.4°C). Occasional snowfall also happens in this period, with 0.79" (20mm) in December and 1.3" (33mm) in February. While these conditions could be attractive to some, those averse to cold weather and potential snow-driven activities might opt to schedule their visit for a different time of the year.
Spring weather in Duncan
Springtime in Duncan sees a gradual increase in temperature, from 51.3°F (10.7°C) in March to a warm 79.3°F (26.3°C) in May. Rainfall can reach as high as 4.37" (111mm) in May, but usually hovers around 1.85" (47mm) in March. Humidity levels moderately rise, from 64% in March to 73% in May while wind patterns remain fairly consistent, averaging between 10.4mph (16.7km/h) and 11.6mph (18.7km/h).
Summer weather in Duncan
Summers in Duncan are known for their warm temperatures. They can range from 86.2°F (30.1°C) in September to 95°F (35°C) in August. Remarkably, rainfall is highest in June and September, recording 1.89" (48mm) and 2.64" (67mm) respectively. However, there is a sharp drop in rainfall during July and August, as Duncan receives only 2.17" (55mm) and 1.61" (41mm) of rain respectively. Sunshine is abundant, with an average of 10.8 hours of sunlight in August.
Autumn weather in Duncan
Autumn in Duncan witnesses a decrease in temperatures from the preceding summer months. October's average high temperature is 72.9°F (22.7°C), which cools down to 61.7°F (16.5°C) by November. The rainfall increases gradually from 2.6" (66mm) in October to 1.06" (27mm) in November. The average number of sunny days starts to decline, from 19.5 days in October to 22 days in November, but still provides ample time to enjoy the city's outdoors.
Winter weather in Duncan
Winters in Duncan are characterized by moderately cold weather, with temperatures ranging from 51.3°F (10.7°C) in December to 33.6°F (0.9°C) in January. Although snowfall can occur, it typically remains below 1.3" (33mm) throughout the winter months. December experiences the highest number of sunshine days, with a count of 23.2 days, while January settles at 24.3 days. Wind speeds generally range from 9.7mph (15.6km/h) to 10.3mph (16.6km/h), making winter in Duncan a relatively calm season.
Weather in January
January in Duncan, Oklahoma tends to be the coolest month of the year. The chill even extends to daylight, with January having the shortest daylight duration out of the entire year. The familiar sights of snowflakes can be observed on about 1.3 days, with the clouds covering 26% of the sky. Weather in January »
Weather in February
As winter drags on, the signs of an imminent spring emergence can be felt in February. The temperature starts to inch upwards from the previous month. Duncan often tosses aside its snow blanket in February, the average snowfall dwindling to 1.3" (33mm). Weather in February »
Weather in March
Come March, the weather is hinting at the shift from winter to spring. With an average high nudging up to 64.9°F (18.3°C), people start to shed their heavy winter coats. The amount of sunshine also increases, contributing to longer days, a factor that excites outdoor enthusiasts. Weather in March »
Weather in April
By April, Duncan, Oklahoma is in the full swing of spring. Temperatures continue to show a steady, noticeable rise, with the average high reaching up to 72.3°F (22.4°C), and the low averages at a mild 52.5°F (11.4°C). April brings in a high amount of rainfall, with an average of 3.07" (78mm) over an expected 11.9 days. Weather in April »
Weather in May
May is a transition month where the last whisper of spring gives way to summer in Duncan. The weather continues to show sunny and warm characteristics, signifying the start of the long days of summer. A high relative humidity often hangs in the air, creating a truly tropical feeling. Weather in May »
Weather in June
June signifies the onset of summer in Duncan, Oklahoma. It brings with it longer days and soaring temperatures. Sun worshippers enjoy this month, which heralds in the highest levels of daylight at 14.4 hours. Sunshine is generous, bathing the city in approximately 10.7 hours of sunny glory. Weather in June »
Weather in July
July is the heart of summer in Duncan, with temperatures often hitting their peak. The heat does not go unnoticed. July bears the crown of the hottest month, with scorching average highs and lows hovering around 94.6°F (34.8°C) and 73.9°F (23.3°C) respectively. Weather in July »
Weather in August
August holds on to the reigns of summer, continuing with warm and sunny weather. The vibrant hues of summer remain strong, even as signs of the approaching autumn subtly begin to hint at a shift. Despite recording the highest temperature of the year at 95°F (35°C), August also sees a decrease in relative humidity. Weather in August »
Weather in September
September nudges towards fall but continues to hold on to the last tendrils of summer. The change in Duncan's weather is more noticeable, with temperatures cooling, and the daylight hours reducing to 12.4. Despite the transition, the maximum temperature averages still hit a high of 86.2°F (30.1°C) with the minimum settling around a comfortable 66.9°F (19.4°C). Weather in September »
Weather in October
October ushers in the full effect of fall. The vibrant colors of summer fade, replaced by the richness of the fall foliage. The drop in temperatures continues, and they begin to trend towards a cooler climate. Though rainfall is frequent at 2.6" (66mm), October experiences a slightly higher sunshine duration of 7 hours as compared to September’s 8.3 hours. Weather in October »
Weather in November
In November, the crispness of fall is tangible. The previous mild weather transitions further towards the colder side, as winter approaches. Wind speeds slightly heighten to an average of 10.3mph (16.6km/h), adding an extra bite to the dropping temperatures. Weather in November »
Weather in December
December is when the full force of winter sets in. The season of snowfalls returns to Duncan with an average snowfall of 0.51" (13mm). The shorter daylight hours and the colder temperatures hint at the longer nights and the winter chill. Weather in December »
Updated: Jun 4, 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
What month is the coldest?
Duncan experiences lowest temperatures, averaging a high-temperature of 51.3°F (10.7°C) during January and December.
How many days does it rain in Duncan?
In Duncan, during the entire year, the rain falls for 113.4 days and collects up to 24.61" (625mm) of precipitation.
When does it snow?
January through April, November and December are months with snowfall.
How much does it snow?
Throughout the year, there are 5.1 snowfall days, and 3.03" (77mm) of snow is accumulated.
What is the driest month?
The month with the least rainfall is February, when the rain falls for 6.8 days and typically collects 1.02" (26mm) of precipitation.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 1.8 days and accumulates 1.3" (33mm) of snow.
When is Daylight Saving Time (DST)?
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.
What is the most humid month?
The most humid month is May, with an average relative humidity of 73%.
What is the rainiest month?
May is the month with the most rainfall. Rain falls for 13.5 days and accumulates 4.37" (111mm) of precipitation.
When it does not snow?
May through October are months without snowfall.
When are the longest days?
With an average of 14h and 24min of daylight, June has the longest days of the year.
What is the month with the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 7.
What month has the most sunshine?
With an average of 11.1h of sunshine, July has the most sunshine of the year in Duncan.
What is the hottest time of year?
In Duncan, August is the month with the highest recorded average temperatures, measuring a high of 95°F (35°C) and a low of 73.6°F (23.1°C).
What is the least humid month?
With an average relative humidity of 55%, August is the least humid month.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 54min of daylight.
What is the month with the least sunshine?
With an average of 6h of sunshine, December has the least sunshine of the year.
When is the lowest UV index?
The month with the lowest UV index is December, with an average maximum UV index of 2.
Average temperature
Duncan, OK
The warmest month (with the highest average high temperature) is August (95°F).
The months with the lowest average high temperature are January and December (51.3°F).
The month with the highest average low temperature is July (73.9°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).
Average pressure
Duncan, OK
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.9"Hg - Average pressure in May:
29.9"Hg - Average pressure in June:
29.88"Hg
- Average pressure in July:
29.92"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed
Duncan, OK
- Average wind speed in January:
10.2mph - Average wind speed in February:
10.9mph - Average wind speed in March:
11.5mph - Average wind speed in April:
11.6mph - Average wind speed in May:
10.4mph - Average wind speed in June:
9.6mph
- Average wind speed in July:
8.3mph - Average wind speed in August:
8.3mph - Average wind speed in September:
8.3mph - Average wind speed in October:
9.7mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.7mph
The windiest month (with the highest average wind speed) is April (11.6mph).
The calmest months (with the lowest average wind speed) are July, August and September (8.3mph).
Average humidity
Duncan, OK
The month with the highest relative humidity is May (73%).
The month with the lowest relative humidity is August (55%).
Average rainfall
Duncan, OK
- Average rainfall in January:
1.18" - Average rainfall in February:
1.02" - Average rainfall in March:
1.85" - Average rainfall in April:
3.07" - Average rainfall in May:
4.37" - Average rainfall in June:
1.89"
- Average rainfall in July:
2.17" - Average rainfall in August:
1.61" - Average rainfall in September:
2.64" - Average rainfall in October:
2.6" - Average rainfall in November:
1.06" - Average rainfall in December:
1.14"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days
Duncan, OK
- Average rainfall days in January:
5 days - Average rainfall days in February:
6.8 days - Average rainfall days in March:
10.3 days - Average rainfall days in April:
11.9 days - Average rainfall days in May:
13.5 days - Average rainfall days in June:
10 days
- Average rainfall days in July:
11.3 days - Average rainfall days in August:
10.5 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
9.6 days - Average rainfall days in November:
6.4 days - Average rainfall days in December:
6 days
The month with the highest number of rainy days is May (13.5 days).
The month with the least rainy days is January (5 days).
Average snowfall
Duncan, OK
The month with the highest snowfall is February (1.3").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Duncan, OK
- Average snowfall days in January:
1.3 days - Average snowfall days in February:
1.8 days - Average snowfall days in March:
0.5 days - Average snowfall days in April:
0.1 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 days - Average snowfall days in November:
0.4 days - Average snowfall days in December:
1 days
The month with the highest number of snowfall days is February (1.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Duncan, OK
- Average daylight in January:
10h and 1min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 0min - Average daylight in June:
14h and 2min
- Average daylight in July:
14h and 1min - Average daylight in August:
13h and 2min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 2min - Average daylight in December:
9h and 5min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in January:
6h and 2min - Average sunshine in February:
7h and 2min - Average sunshine in March:
7h and 3min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 1min - Average sunshine in June:
10h and 4min
- Average sunshine in July:
11h and 1min - Average sunshine in August:
10h and 5min - Average sunshine in September:
8h and 2min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 1min - Average sunshine in December:
6h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days
Duncan, OK
- Average sunshine days in January:
24.3 days - Average sunshine days in February:
19.1 days - Average sunshine days in March:
18.5 days - Average sunshine days in April:
16.5 days - Average sunshine days in May:
15.7 days - Average sunshine days in June:
18.2 days
- Average sunshine days in July:
18.3 days - Average sunshine days in August:
18.3 days - Average sunshine days in September:
16 days - Average sunshine days in October:
19.5 days - Average sunshine days in November:
22 days - Average sunshine days in December:
23.2 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is May (15.7 days).
Average UV index
Duncan, OK
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover
Duncan, OK
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 20).
Average visibility
Duncan, OK
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).
Duncan, Oklahoma, USA
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