Climate and monthly weather forecastIrmo, SC
Climate and monthly weather forecast
The climate of Irmo
Irmo, South Carolina, USA, is characterized by a Humid subtropical climate, noted as Cfa in the Köppen climate classification. This suggests that the town endures no dry season and has consistently humid conditions.The annual temperature in Irmo transitions from a moderate low of 36.9°F (2.7°C) in January to a warm high of 91.4°F (33°C) in July. It is evident that the temperature fluctuates throughout the months, providing a diverse range of weather conditions for the year. Humidity levels can also encompass a small range from 70% in the warmest months to 75% in the colder months, offering damp conditions most times.
Precipitation patterns reveal that rainfall remains reasonably steady across the year, with a slight increase from 2.01" (51mm) in January to 3.11" (79mm) in December. On the other hand, the number of days with rain tends to peak in July, reaching up to a maximum of 17.4 days. Notably, snowfall is nearly absent in Irmo, peaking just at 0.24" (6mm) in January and 0.08" (2mm) in December and zero out for the rest of the year.
The best time to visit Irmo
The optimal time to visit Irmo would be the period from May to July. During these months, the town experiences its highest sunshine hours, averaging around 10.8 hours a day in June and July. The average daily temperature ranges from a pleasant 81°F (27.2°C) to a warm high of 91.4°F (33°C), inviting for most outdoor activities. The humidity levels are at a moderately comfortable range, around 70% to 74%, making it bearable for most visitors. Despite the possibility of rainfall, the number of days with clear skies or low cloud percentages makes these months ideal for tourist activities.The worst time to visit Irmo
The least welcoming time to visit Irmo might be the chilly months from November to February. During this span, temperatures can fall to 36.9°F (2.7°C) in January, the lowest of the year. While snowfall is infrequent, the couple of inches present in winter could result in damp conditions, further reducing comfort levels. The lower daylight hour, averaging from 9.9 hours to 10.4 hours in these months, can lead to shorter days and less time for outdoor explorations.Spring weather in Irmo
In Irmo, the months of March, April, and May, constitute the spring season. The highest temperature averages 73.4°F (23°C) in May, with the lowest temperature averaging from 46°F (7.8°C) in March up to 62.6°F (17°C) in May. The town also experiences acceleration of daylight hours, rising from 12 hours in March to 13.9 hours in May. Rainfall averages from 2.36" (60mm) in March to 2.68" (68mm) in May, suggesting frequent rainy days. Nevertheless, a rise in sunshine hours per day is noticeable, presenting a pleasant time to experience the city's charm.Summer weather in Irmo
Encompassing months of June, July, and August, summer in Irmo is a showcase of warm and somewhat humid times. With a temperature gradient moving from 88.3°F (31.3°C) in June to 90°F (32.2°C) in August, the weather remains tropical. Precipitation figures slightly elevate, with July receiving the highest rainfall of 2.48" (63mm). Days with sunshine dominate the weather outlook, and a relative reduction is seen in cloud percentage. Taking into account these conditions, Irmo's summer is warm, lively, and perfect for sun-soaked ventures.Autumn weather in Irmo
As the town moves into the autumn months of September to November, the climate undergoes a palpable shift. A steady decline in temperatures is noticed, starting at 84.7°F (29.3°C) in September and reaching down to 62.2°F (16.8°C) by November. Correspondingly, there is a decrease in daylight hours, which fall from 12.4 hours to 10.4 hours. The rainfall increases slightly in September and reduces again in November. Despite this, autumn's cooler temperatures and reducing humidity make it a scenic time to visit.Winter weather in Irmo
The winter season in Irmo comprises the months from December through to February. The temperatures during these months fall to an average low of 36.9°F (2.7°C) in January and average high around 55.8°F (13.2°C) in December. The duration of daylight is also least during these months, averaging about 10 hours a day. Snowfall is minimal yet adds a different dimension to the township's climate. With increased cloud coverage and cooler temperatures, Irmo's winters are a stark contrast to its humid subtropical climate experienced throughout the year.Weather in January
The advent of the new year brings cooler weather, with January being one of the coldest months in Irmo, South Carolina. Visitors and residents alike will feel the need for layers, as chilly temperatures prevail over the region. Weather in January »Weather in February
February continues the trend of cooler temperatures in Irmo but also serves as an introduction to warmer days ahead. The weather remains stable, with minor fluctuations in temperature marking the transition from winter to spring. Weather in February »Weather in March
March signals the start of spring in Irmo, leading to the gradual rise in prevailing weather conditions. Clear skies and longer daylight hours signify the seasonal change. Warmer temperatures start to emerge, yet the rainfall increases to 2.36" (60mm), making this month relatively wet. Weather in March »Weather in April
In April, the true essence of spring is reflected in the weather with temperatures rising on a consistent basis. This time of the year is characterized by abundant sunshine and clear skies, making it perfect for outdoor adventures. Weather in April »Weather in May
May is the transition period between spring and summer in Irmo, marked by pleasing weather which is ideal for all sorts of outdoor activities. With consistent increase in temperatures, basking in the sun becomes a daily routine. A marginal rise in rainfall, at 2.68" (68mm), signifies a moist atmosphere, yet it is not strong enough to dampen the spirits. Weather in May »Weather in June
June is the marker of summer's arrival in Irmo with temperatures soaring and causing a noticeable change in the climate. It is during this month that people start hitting the beach, having picnics, and generally spending more time outdoors. Weather in June »Weather in July
Welcome to the warmest and sunniest part of the year as July welcomes peak summer. Tourists and locals don their summer clothing and venture out to savor the delightful seasonal conditions. The peak temperature of the entire year, around 91.4°F (33°C), can be observed during July, making it the hottest month. Weather in July »Weather in August
August maintains the trend of high temperatures though there is a slight relief from the heat compared to July. The weather is still largely warm, characterized by long, sunny days inviting for dips in the pool or lounging by the beach. Weather in August »Weather in September
September brings with it the onset of autumn, and a welcome respite from the summer heat in Irmo. The weather gradually cools down, inviting the beauty of fall and making outdoor activities even more enjoyable. The drop in temperature is complemented by a decrease in rainfall, registering only 1.54" (39mm), the lowest of the year. Weather in September »Weather in October
October is the month where autumn firmly establishes itself, bringing abundant fall foliage and comfortable temperatures perfect for enjoying the outdoors. This is the month when pumpkin patches and cozy sweaters become the norm, greatly enhancing the Irmo experience. Weather in October »Weather in November
November in Irmo showcases a significant drop in temperatures, announcing the advent of the winter season. The weather, although colder, still allows for pleasant outdoor activities as the fall season comes to a close. Rainfall witnesses a slight decline, marking 1.93" (49mm), making November relatively less wet. Weather in November »Weather in December
In December, Irmo, South Carolina, experiences the chill of winter with temperatures hitting their lowest for the year. It's a time of year marked by cozy indoor activities, warm drinks, and the holiday season. A slight snowfall of 0.08" (2mm) can be witnessed, indicating the arrival of winter. Weather in December »Updated: Aug 16, 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, characterized by an average high temperature of 52.3°F (11.3°C) and a low temperature of 36.9°F (2.7°C), is generally the coldest month.
Throughout the year, in Irmo, South Carolina, there are 147.8 rainfall days, and 28.23" (717mm) of precipitation is accumulated.
January through March and December are months with snowfall in Irmo.
Throughout the year, in Irmo, there are 1.2 snowfall days, and 0.79" (20mm) of snow is accumulated.
January is the month with the lowest UV index, with an average maximum UV index of 2.
February is the month with the most snowfall. Snow falls for 0.4 days and accumulates 0.43" (11mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.
In Irmo, snow does not fall in April through November.
With an average of 14h and 24min of daylight, June has the longest days of the year.
The months with the highest UV index are June and July, with an average maximum UV index of 7.
Irmo experiences its average highest temperatures in July, reaching a peak of 91.4°F (33°C) and a minimum of 72.9°F (22.7°C).
July is the least humid month, with an average relative humidity of 70%.
The month with the most sunshine is July, with an average of 10.9h of sunshine.
The month with the least rainfall is September, when the rain falls for 12 days and typically collects 1.54" (39mm) of precipitation.
With an average relative humidity of 75%, December is the most humid month.
The month with the most rainfall is December, when the rain falls for 11.1 days and typically aggregates up to 3.11" (79mm) of precipitation.
With an average of 9h and 54min of daylight, December has the shortest days of the year.
With an average of 5.5h of sunshine, December has the least sunshine of the year.
Average temperature
Irmo, SC
The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is January (52.3°F).
The month with the highest average low temperature is July (72.9°F).
The coldest month (with the lowest average low temperature) is January (36.9°F).
Average pressure
Irmo, SC
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
30.02"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
29.97"Hg
- Average pressure in July:
29.99"Hg - Average pressure in August:
29.99"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.14"Hg - Average pressure in December:
30.14"Hg
The months with the highest atmospheric pressure are January, November and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.97"Hg).
Average wind speed
Irmo, SC
- Average wind speed in January:
7.9mph - Average wind speed in February:
8.2mph - Average wind speed in March:
8.1mph - Average wind speed in April:
8.3mph - Average wind speed in May:
6.9mph - Average wind speed in June:
6mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
5.3mph - Average wind speed in September:
5.8mph - Average wind speed in October:
6.8mph - Average wind speed in November:
6.9mph - Average wind speed in December:
7.3mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity
Irmo, SC
The month with the highest relative humidity is December (75%).
The month with the lowest relative humidity is July (70%).
Average rainfall
Irmo, SC
- Average rainfall in January:
2.01" - Average rainfall in February:
2.32" - Average rainfall in March:
2.36" - Average rainfall in April:
2.64" - Average rainfall in May:
2.68" - Average rainfall in June:
2.24"
- Average rainfall in July:
2.48" - Average rainfall in August:
2.87" - Average rainfall in September:
1.54" - Average rainfall in October:
2.05" - Average rainfall in November:
1.93" - Average rainfall in December:
3.11"
The wettest month (with the highest rainfall) is December (3.11").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days
Irmo, SC
- Average rainfall days in January:
9.8 days - Average rainfall days in February:
10.8 days - Average rainfall days in March:
13.3 days - Average rainfall days in April:
13.1 days - Average rainfall days in May:
14.6 days - Average rainfall days in June:
14 days
- Average rainfall days in July:
17.4 days - Average rainfall days in August:
16 days - Average rainfall days in September:
12 days - Average rainfall days in October:
7.8 days - Average rainfall days in November:
7.9 days - Average rainfall days in December:
11.1 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is October (7.8 days).
Average snowfall
Irmo, SC
The month with the highest snowfall is February (0.43").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days
Irmo, SC
- Average snowfall days in January:
0.5 days - Average snowfall days in February:
0.4 days - Average snowfall days in March:
0.2 days - Average snowfall days in April:
0 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 days - Average snowfall days in December:
0.1 days
The month with the highest number of snowfall days is January (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight / Average sunshine
Irmo, SC
- Average daylight in January:
10h and 12min - Average daylight in February:
11h and 0min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
13h and 54min - Average daylight in June:
14h and 24min
- Average daylight in July:
14h and 12min - Average daylight in August:
13h and 24min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 24min - Average daylight in December:
9h and 54min
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:
5h and 36min - Average sunshine in February:
6h and 42min - Average sunshine in March:
7h and 24min - Average sunshine in April:
9h and 12min - Average sunshine in May:
10h and 0min - Average sunshine in June:
10h and 48min
- Average sunshine in July:
10h and 54min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 36min - Average sunshine in October:
6h and 42min - Average sunshine in November:
5h and 54min - Average sunshine in December:
5h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days
Irmo, SC
- Average sunshine days in January:
19.5 days - Average sunshine days in February:
15.8 days - Average sunshine days in March:
16.3 days - Average sunshine days in April:
15.5 days - Average sunshine days in May:
14.7 days - Average sunshine days in June:
13.6 days
- Average sunshine days in July:
10.8 days - Average sunshine days in August:
12.9 days - Average sunshine days in September:
15.9 days - Average sunshine days in October:
21.8 days - Average sunshine days in November:
20.3 days - Average sunshine days in December:
18.8 days
The month with the most sunshine days is October (21.8 days).
The month with the least sunshine days is July (10.8 days).
Average UV index
Irmo, SC
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover
Irmo, SC
The months with the most cloud cover are February and December (Cloud cover 41).
The months with the least cloud cover are June and October (Cloud cover 28).
Average visibility
Irmo, SC
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).
