Climate and monthly weather forecastIwanai, Japan
Climate and monthly weather forecast
Weather in January
January, the same as December, in Iwanai, Japan, is another subzero cold winter month, with an average temperature fluctuating between -3.8°C (25.2°F) and -8.3°C (17.1°F). January is the month that records the lowest temperatures, with averages ranging from a high of -3.8°C (25.2°F) to a low of -8.3°C (17.1°F). Weather in January »Weather in February
February, the last month of the winter in Iwanai, is also a subzero cold month, with an average temperature ranging between min -8.9°C (16°F) and max -3.4°C (25.9°F). February notes an average high-temperature of a still subzero cold -3.4°C (25.9°F), subtly differing from January's -3.8°C (25.2°F). Weather in February »Weather in March
The first month of the spring, March, is a cold month in Iwanai, Japan, with an average temperature varying between -5.3°C (22.5°F) and 0.7°C (33.3°F). March witnesses a subtle temperature ascent, adjusting from a freezing cold -3.4°C (25.9°F) in February to an icy 0.7°C (33.3°F). Weather in March »Weather in April
April in Iwanai, Japan, is a frosty spring month, with temperature in the range of an average high of 7.3°C (45.1°F) and an average low of 0.5°C (32.9°F). Iwanai's weather in April shows a rise in the average high-temperature, moving up from March's cold 0.7°C (33.3°F) to a chilly 7.3°C (45.1°F). Weather in April »Weather in May
The last month of the spring, May, is a moderate month in Iwanai, Japan, with temperature in the range of an average high of 14.4°C (57.9°F) and an average low of 6.2°C (43.2°F). Iwanai in May experiences an increase in the average high-temperature, moving from April's chilly 7.3°C (45.1°F) to a refreshing 14.4°C (57.9°F). Weather in May »Weather in June
June, the first month of the summer in Iwanai, is an enjoyable month, with an average temperature varying between 10.2°C (50.4°F) and 18.6°C (65.5°F). The shift into June brings a slight increase in the average high-temperature, moving from a moderate 14.4°C (57.9°F) in May to an enjoyable 18.6°C (65.5°F). Weather in June »Weather in July
July is a pleasant summer month in Iwanai, Japan, with an average temperature fluctuating between 22.5°C (72.5°F) and 14.9°C (58.8°F). The onset of July introduces a subtle rise in the average high-temperature, nudging from a refreshing 18.6°C (65.5°F) in June to a pleasant 22.5°C (72.5°F). Weather in July »Weather in August
August, the last month of the summer in Iwanai, is a warm month, with an average temperature varying between 16.1°C (61°F) and 23.3°C (73.9°F). August is the month when Iwanai's temperatures reach their peak, with averages of 23.3°C (73.9°F) and lows of 16.1°C (61°F). Weather in August »Weather in September
The first month of the autumn, September, is also an enjoyable month in Iwanai, Japan, with an average temperature ranging between max 19.6°C (67.3°F) and min 12.3°C (54.1°F). In Iwanai, the average high-temperature in September gently drops from a warm 23.3°C (73.9°F) in August to a comfortable 19.6°C (67.3°F). Weather in September »Weather in October
October, like September, in Iwanai, Japan, is another fresh autumn month, with an average temperature fluctuating between 5.9°C (42.6°F) and 12.6°C (54.7°F). Iwanai observes a minor decrease in the average high-temperature with the arrival of October, falling from September's enjoyable 19.6°C (67.3°F) to a fresh 12.6°C (54.7°F). Weather in October »Weather in November
November, the last month of the autumn in Iwanai, is also an icy month, with temperature in the range of an average high of 4.9°C (40.8°F) and an average low of -0.3°C (31.5°F). November brings a drop in Iwanai's average high-temperature, falling from a fresh 12.6°C (54.7°F) in October to a cold 4.9°C (40.8°F). Weather in November »Weather in December
December, the first month of the winter in Iwanai, is still a freezing cold month, with an average temperature varying between -1.6°C (29.1°F) and -6°C (21.2°F). A decrease in the average high-temperature is observed during December, shifting from an icy 4.9°C (40.8°F) in November to a subzero cold -1.6°C (29.1°F). Weather in December »Updated: Jul 3, 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
The month of January, characterized by an average high of -3.8°C (25.2°F) and a low of -8.3°C (17.1°F), is recognized as the coldest.
The months with the highest humidity are January and February, with an average relative humidity of 89%.
In Iwanai, during the entire year, the rain falls for 157.1 days and collects up to 887mm (34.92") of precipitation.
Months with snowfall are January through May, October through December.
In Iwanai, during the entire year, snow falls for 120.8 days and aggregates up to 2288mm (90.08") of snow.
The month with the least sunshine is January, with an average of 1.4h of sunshine.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 1.
With an average relative humidity of 79%, April is the least humid month.
The month with the least rainfall is April, when the rain falls for 14 days and typically collects 52mm (2.05") of precipitation.
The months with the most sunshine are May and August, with an average of 8.4h of sunshine.
In Iwanai, snow does not fall in June through September.
June has the longest days of the year in Iwanai, with an average of 15h and 18min of daylight.
July and August, with an average maximum UV index of 5, are months with the highest UV index.
August, on average, is the warmest month, registering a high temperature of 23.3°C (73.9°F) and a low of 16.1°C (61°F).
August is the month with the most rainfall. Rain falls for 19.1 days and accumulates 105mm (4.13") of precipitation.
The month with the most snowfall is December, when snow falls for 25.9 days and typically aggregates up to 598mm (23.54") of snow.
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Iwanai does not observe Daylight Saving Time (DST). JST timezone is used throughout the entire year.
Average temperature
Iwanai, Japan
The warmest month (with the highest average high temperature) is August (23.3°C).
The month with the lowest average high temperature is January (-3.8°C).
The month with the highest average low temperature is August (16.1°C).
The coldest month (with the lowest average low temperature) is February (-8.9°C).
Average pressure
Iwanai, Japan
- Average pressure in January:
1013.7mbar - Average pressure in February:
1015.3mbar - Average pressure in March:
1013.7mbar - Average pressure in April:
1012.4mbar - Average pressure in May:
1010.3mbar - Average pressure in June:
1008.7mbar
- Average pressure in July:
1008.4mbar - Average pressure in August:
1009.5mbar - Average pressure in September:
1013.4mbar - Average pressure in October:
1016.1mbar - Average pressure in November:
1016.4mbar - Average pressure in December:
1013.4mbar
The month with the highest atmospheric pressure is November (1016.4mbar).
The month with the lowest atmospheric pressure is July (1008.4mbar).
Average wind speed
Iwanai, Japan
- Average wind speed in January:
14.1km/h - Average wind speed in February:
13.9km/h - Average wind speed in March:
12.9km/h - Average wind speed in April:
12.6km/h - Average wind speed in May:
11.1km/h - Average wind speed in June:
8.8km/h
- Average wind speed in July:
8.2km/h - Average wind speed in August:
8km/h - Average wind speed in September:
9.6km/h - Average wind speed in October:
12.3km/h - Average wind speed in November:
12.7km/h - Average wind speed in December:
14.5km/h
The windiest month (with the highest average wind speed) is December (14.5km/h).
The calmest month (with the lowest average wind speed) is August (8km/h).
Average humidity
Iwanai, Japan
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is April (79%).
Average rainfall
Iwanai, Japan
The wettest month (with the highest rainfall) is August (105mm).
The driest month (with the least rainfall) is April (52mm).
Average rainfall days
Iwanai, Japan
- Average rainfall days in January:
3.4 days - Average rainfall days in February:
3.8 days - Average rainfall days in March:
9.6 days - Average rainfall days in April:
14 days - Average rainfall days in May:
15.6 days - Average rainfall days in June:
17.2 days
- Average rainfall days in July:
19 days - Average rainfall days in August:
19.1 days - Average rainfall days in September:
17.9 days - Average rainfall days in October:
17.1 days - Average rainfall days in November:
13.9 days - Average rainfall days in December:
6.5 days
The month with the highest number of rainy days is August (19.1 days).
The month with the least rainy days is January (3.4 days).
Average snowfall
Iwanai, Japan
- Average snowfall in January:
493mm - Average snowfall in February:
421mm - Average snowfall in March:
347mm - Average snowfall in April:
115mm - Average snowfall in May:
5mm - Average snowfall in June:
0mm
The month with the highest snowfall is December (598mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days
Iwanai, Japan
- Average snowfall days in January:
28.3 days - Average snowfall days in February:
24.3 days - Average snowfall days in March:
20.8 days - Average snowfall days in April:
6.8 days - Average snowfall days in May:
0.4 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:
1.3 days - Average snowfall days in November:
13 days - Average snowfall days in December:
25.9 days
The month with the highest number of snowfall days is January (28.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Iwanai, Japan
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 30min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 18min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
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 6min).
- Average sunshine in January:
1h and 24min - Average sunshine in February:
1h and 42min - Average sunshine in March:
3h and 54min - Average sunshine in April:
7h and 54min - Average sunshine in May:
8h and 24min - Average sunshine in June:
7h and 30min
- Average sunshine in July:
7h and 12min - Average sunshine in August:
8h and 24min - Average sunshine in September:
7h and 36min - Average sunshine in October:
6h and 12min - Average sunshine in November:
3h and 12min - Average sunshine in December:
1h and 42min
The months with the most sunshine are May and August (Average sunshine: 8h and 24min).
The month with the least sunshine is January (Average sunshine: 1h and 24min).
Average sunshine days
Iwanai, Japan
- Average sunshine days in January:
2.7 days - Average sunshine days in February:
3.5 days - Average sunshine days in March:
6.1 days - Average sunshine days in April:
10.5 days - Average sunshine days in May:
13.3 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
9 days - Average sunshine days in August:
9.4 days - Average sunshine days in September:
8.6 days - Average sunshine days in October:
10.2 days - Average sunshine days in November:
5.2 days - Average sunshine days in December:
3.1 days
The month with the most sunshine days is May (13.3 days).
The month with the least sunshine days is January (2.7 days).
Average UV index
Iwanai, Japan
The months with the highest UV index are July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 1).
Average cloud cover
Iwanai, Japan
The month with the most cloud cover is January (Cloud cover 86).
The month with the least cloud cover is September (Cloud cover 43).
Average visibility
Iwanai, Japan
The months with the highest visibility are April, May and October (9km).
The months with the lowest visibility are January, February, July, August and December (7km).
