Climate and monthly weather forecastIrumagawa, Japan
Climate and monthly weather forecast
Weather in January
January, the same as December, in Irumagawa, Japan, is a frosty winter month, with an average temperature varying between 8.4°C (47.1°F) and 1.4°C (34.5°F). The coldest period tends to be January, when average temperatures fluctuate between a high of 8.4°C (47.1°F) and a low of 1.4°C (34.5°F). Weather in January »Weather in February
The last month of the winter, February, is another chilly month in Irumagawa, Japan, with temperature in the range of an average low of 2°C (35.6°F) and an average high of 9.3°C (48.7°F). Irumagawa, Japan, registers an average high-temperature of a still frosty 9.3°C (48.7°F) at the commencement of February, closely related to the preceding month. Weather in February »Weather in March
The first month of the spring, March, is a moderate month in Irumagawa, Japan, with temperature in the range of an average high of 13.1°C (55.6°F) and an average low of 5°C (41°F). With the onset of March, Irumagawa's average high-temperature experiences a slight rise, moving from February's chilly 9.3°C (48.7°F) to a refreshing 13.1°C (55.6°F). Weather in March »Weather in April
April in Irumagawa, Japan, is an enjoyable spring month, with an average temperature varying between 18°C (64.4°F) and 9.3°C (48.7°F). As Irumagawa welcomes April, the average high-temperature sees a modest rise, transitioning from a refreshing 13.1°C (55.6°F) in March to a comfortable 18°C (64.4°F). Weather in April »Weather in May
May, the last month of the spring in Irumagawa, is a warm month, with an average temperature fluctuating between 15.3°C (59.5°F) and 23.9°C (75°F). May's arrival coincides with a rise in the average high-temperature, moving from April's comfortable 18°C (64.4°F) to a warm 23.9°C (75°F). Weather in May »Weather in June
The first month of the summer, June, is still a warm month in Irumagawa, Japan, with an average temperature varying between 18.9°C (66°F) and 26.1°C (79°F). During June, Irumagawa records an average high-temperature of a still moderately hot 26.1°C (79°F), marking a slight divergence from May's 23.9°C (75°F). Weather in June »Weather in July
July is a hot summer month in Irumagawa, Japan, with an average temperature ranging between max 30.4°C (86.7°F) and min 23.1°C (73.6°F). July signals a minor shift in the average high-temperature, moving from June's warm 26.1°C (79°F) to a hot 30.4°C (86.7°F). Weather in July »Weather in August
August, the last month of the summer in Irumagawa, is also a hot month, with an average temperature fluctuating between 32°C (89.6°F) and 24.7°C (76.5°F). Temperature records mark August as the warmest month, with highs averaging 32°C (89.6°F) and lows at 24.7°C (76.5°F). August's heat index is computed to be a scorching 40°C (104°F). Weather in August »Weather in September
September, the first month of the autumn in Irumagawa, is still a warm month, with an average temperature varying between 27.4°C (81.3°F) and 20.5°C (68.9°F). Irumagawa's transition into September involves a gentle shift in temperature, receding from a tropical 32°C (89.6°F) in August to a warm 27.4°C (81.3°F). Weather in September »Weather in October
October, like September, is another pleasant autumn month in Irumagawa, Japan, with an average temperature fluctuating between 15.2°C (59.4°F) and 21.5°C (70.7°F). As Irumagawa enters October, the average high-temperature decreases from the a moderately hot 27.4°C (81.3°F) of September to a pleasant 21.5°C (70.7°F). Weather in October »Weather in November
The last month of the autumn, November, is another mild month in Irumagawa, Japan, with temperature in the range of an average low of 9.5°C (49.1°F) and an average high of 15.8°C (60.4°F). Irumagawa in November experiences a subtle temperature decline, with average high-temperatures reducing from a pleasant 21.5°C (70.7°F) in October to a mild 15.8°C (60.4°F). Weather in November »Weather in December
December, the first month of the winter in Irumagawa, is still a cool month, with an average temperature ranging between min 4.3°C (39.7°F) and max 10.5°C (50.9°F). December comes with a decrease in the average high-temperature, falling from a mild 15.8°C (60.4°F) in November to a cool 10.5°C (50.9°F). Weather in December »Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Irumagawa's coldest month, January, generally records average temperatures ranging from a high of 8.4°C (47.1°F) to a low of 1.4°C (34.5°F).
January is the least humid month, with an average relative humidity of 58%.
In Irumagawa, during the entire year, the rain falls for 146.2 days and collects up to 669mm (26.34") of precipitation.
January through March and November are months with snowfall.
In Irumagawa, Japan, during the entire year, snow falls for 3.7 days and aggregates up to 62mm (2.44") of snow.
With an average maximum UV index of 2, January is the month with the lowest UV index.
February is the month with the most snowfall. Snow falls for 2.1 days and accumulates 39mm (1.54") of snow.
February and November, with an average of 6.2h of sunshine, are months with the least sunshine in Irumagawa, Japan.
April through October and December are months without snowfall in Irumagawa.
June and July, with an average relative humidity of 73%, are most humid months in Irumagawa, Japan.
With an average of 14h and 30min of daylight, June has the longest days of the year.
With an average maximum UV index of 7, July is the month with the highest UV index.
August is the month when Irumagawa sees the average highest temperatures, with a high of 32°C (89.6°F) and a low of 24.7°C (76.5°F).
The month with the most sunshine in Irumagawa is August, with an average of 9.8h of sunshine.
October is the month with the most rainfall in Irumagawa, Japan. Rain falls for 15.3 days and accumulates 102mm (4.02") of precipitation.
December is the month with the least rainfall in Irumagawa. Rain falls for 5.8 days and accumulates 21mm (0.83") of precipitation.
With an average of 9h and 48min of daylight, December has the shortest days of the year in Irumagawa.
Irumagawa, Japan, does not utilize Daylight Saving Time (DST). JST timezone is used over the entire year.
Average temperature
Irumagawa, Japan
The warmest month (with the highest average high temperature) is August (32°C).
The month with the lowest average high temperature is January (8.4°C).
The month with the highest average low temperature is August (24.7°C).
The coldest month (with the lowest average low temperature) is January (1.4°C).
Average pressure
Irumagawa, Japan
- Average pressure in January:
1016.6mbar - Average pressure in February:
1017.5mbar - Average pressure in March:
1015.7mbar - Average pressure in April:
1014.3mbar - Average pressure in May:
1012mbar - Average pressure in June:
1009.2mbar
- Average pressure in July:
1009.8mbar - Average pressure in August:
1010.3mbar - Average pressure in September:
1013.7mbar - Average pressure in October:
1016.8mbar - Average pressure in November:
1018.4mbar - Average pressure in December:
1016.6mbar
The month with the highest atmospheric pressure is November (1018.4mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed
Irumagawa, Japan
- Average wind speed in January:
11.2km/h - Average wind speed in February:
11.3km/h - Average wind speed in March:
11.4km/h - Average wind speed in April:
11.5km/h - Average wind speed in May:
10.4km/h - Average wind speed in June:
9.4km/h
- Average wind speed in July:
8.7km/h - Average wind speed in August:
8.8km/h - Average wind speed in September:
9km/h - Average wind speed in October:
9.9km/h - Average wind speed in November:
8.9km/h - Average wind speed in December:
10.3km/h
The windiest month (with the highest average wind speed) is April (11.5km/h).
The calmest month (with the lowest average wind speed) is July (8.7km/h).
Average humidity
Irumagawa, Japan
The months with the highest relative humidity are June and July (73%).
The month with the lowest relative humidity is January (58%).
Average rainfall
Irumagawa, Japan
The wettest month (with the highest rainfall) is October (102mm).
The driest month (with the least rainfall) is December (21mm).
Average rainfall days
Irumagawa, Japan
- Average rainfall days in January:
4.8 days - Average rainfall days in February:
6.7 days - Average rainfall days in March:
11.7 days - Average rainfall days in April:
13.2 days - Average rainfall days in May:
13.3 days - Average rainfall days in June:
18.5 days
- Average rainfall days in July:
16.8 days - Average rainfall days in August:
16.3 days - Average rainfall days in September:
14.7 days - Average rainfall days in October:
15.3 days - Average rainfall days in November:
9.1 days - Average rainfall days in December:
5.8 days
The month with the highest number of rainy days is June (18.5 days).
The month with the least rainy days is January (4.8 days).
Average snowfall
Irumagawa, Japan
The month with the highest snowfall is February (39mm).
The months with the least snowfall are April, May, June, July, August, September, October and December (0mm).
Average snowfall days
Irumagawa, Japan
- Average snowfall days in January:
1 days - Average snowfall days in February:
2.1 days - Average snowfall days in March:
0.5 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:
0.1 days - Average snowfall days in December:
0 days
The month with the highest number of snowfall days is February (2.1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and December (0 days).
Average daylight / Average sunshine
Irumagawa, Japan
- Average daylight in January:
10h and 0min - Average daylight in February:
10h and 54min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 6min - Average daylight in May:
14h and 6min - Average daylight in June:
14h and 30min
- Average daylight in July:
14h and 18min - Average daylight in August:
13h and 30min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 18min - Average daylight in November:
10h and 18min - Average daylight in December:
9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in January:
6h and 42min - Average sunshine in February:
6h and 12min - Average sunshine in March:
7h and 0min - Average sunshine in April:
9h and 12min - Average sunshine in May:
9h and 30min - Average sunshine in June:
8h and 42min
- Average sunshine in July:
9h and 12min - Average sunshine in August:
9h and 48min - Average sunshine in September:
7h and 42min - Average sunshine in October:
6h and 42min - Average sunshine in November:
6h and 12min - Average sunshine in December:
6h and 30min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The months with the least sunshine are February and November (Average sunshine: 6h and 12min).
Average sunshine days
Irumagawa, Japan
- Average sunshine days in January:
25.3 days - Average sunshine days in February:
18.7 days - Average sunshine days in March:
18 days - Average sunshine days in April:
15.1 days - Average sunshine days in May:
15.8 days - Average sunshine days in June:
9.1 days
- Average sunshine days in July:
9.9 days - Average sunshine days in August:
11.3 days - Average sunshine days in September:
11.7 days - Average sunshine days in October:
14.1 days - Average sunshine days in November:
19.2 days - Average sunshine days in December:
24.5 days
The month with the most sunshine days is January (25.3 days).
The month with the least sunshine days is June (9.1 days).
Average UV index
Irumagawa, Japan
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is January (UV index 2).
Average cloud cover
Irumagawa, Japan
The month with the most cloud cover is June (Cloud cover 45).
The month with the least cloud cover is January (Cloud cover 26).
Average visibility
Irumagawa, Japan
The months with the highest visibility are January, February, March, April, May, November and December (10km).
The months with the lowest visibility are June, July, August, September and October (9km).
