Climate and monthly weather forecastIiyama, Japan
Climate and monthly weather forecast
Weather in January
January, like December, in Iiyama, Japan, is another cold winter month, with an average temperature varying between -6.5°C (20.3°F) and 0.8°C (33.4°F). Iiyama's coldest weather arrives in January, when temperatures average a high of 0.8°C (33.4°F) and a low of -6.5°C (20.3°F). Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Iiyama, Japan, with an average temperature fluctuating between 1.7°C (35.1°F) and -6°C (21.2°F). The arrival of February brings an average high-temperature of a still cold 1.7°C (35.1°F), subtly diverging from January's 0.8°C (33.4°F). Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Iiyama, Japan, with an average temperature varying between 6.3°C (43.3°F) and -2.4°C (27.7°F). The arrival of March brings a soft temperature shift, with the average high-temperature nudging from a cold 1.7°C (35.1°F) in February to a chilly 6.3°C (43.3°F). Weather in March »Weather in April
April is a cool spring month in Iiyama, Japan, with an average temperature varying between 12.3°C (54.1°F) and 2.3°C (36.1°F). An upsurge in temperatures occurs as March gives way to April, with average highs shifting from a frosty 6.3°C (43.3°F) to a fresh 12.3°C (54.1°F). Weather in April »Weather in May
May, the last month of the spring in Iiyama, is a comfortable month, with an average temperature fluctuating between 8°C (46.4°F) and 19.6°C (67.3°F). The shift into May is accompanied by a temperature increase, with the average high-temperature rising from a fresh 12.3°C (54.1°F) in April to a refreshing 19.6°C (67.3°F). Weather in May »Weather in June
June, the first month of the summer in Iiyama, is an agreeable month, with an average temperature fluctuating between 11.9°C (53.4°F) and 22.8°C (73°F). June's arrival coincides with a marginal rise in the average high-temperature, moving from May's enjoyable 19.6°C (67.3°F) to a pleasant 22.8°C (73°F). Weather in June »Weather in July
July is a moderately hot summer month in Iiyama, Japan, with an average temperature ranging between min 17°C (62.6°F) and max 26.3°C (79.3°F). July's arrival is noted with a slight increase in the average high-temperature, moving from an agreeable 22.8°C (73°F) in June to a moderately hot 26.3°C (79.3°F). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Iiyama, Japan, with an average temperature ranging between max 27.8°C (82°F) and min 17.7°C (63.9°F). In Iiyama, the highest average temperatures are observed in August, with a high of 27.8°C (82°F) and a low of 17.7°C (63.9°F). August's average heat index is calculated to be a tropical 32°C (89.6°F). Weather in August »Weather in September
September, the first month of the autumn in Iiyama, is still a pleasant month, with an average temperature fluctuating between 13.4°C (56.1°F) and 22.6°C (72.7°F). A change in temperatures is noted as August gives way to September, with average highs reducing from a warm 27.8°C (82°F) to an agreeable 22.6°C (72.7°F). Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in Iiyama, Japan, with an average temperature fluctuating between 16.9°C (62.4°F) and 7.6°C (45.7°F). The arrival of October indicates a decrease in the average high-temperature, moving from an agreeable 22.6°C (72.7°F) in September to a refreshing 16.9°C (62.4°F). Weather in October »Weather in November
The last month of the autumn, November, is another cool month in Iiyama, Japan, with an average temperature fluctuating between 10.5°C (50.9°F) and 2.5°C (36.5°F). The average high-temperature drops in November, from October's comfortable 16.9°C (62.4°F) to a fresh 10.5°C (50.9°F). Weather in November »Weather in December
The first month of the winter, December, is also an icy month in Iiyama, Japan, with temperature in the range of an average low of -3°C (26.6°F) and an average high of 3.9°C (39°F). The arrival of December indicates a decrease in the average high-temperature, moving from a cool 10.5°C (50.9°F) in November to a wintry 3.9°C (39°F). Weather in December »Updated: Jun 23, 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
January is the coldest month, exhibiting average temperatures of 0.8°C (33.4°F) at the peak and -6.5°C (20.3°F) at the base.
The most humid month in Iiyama is January, with an average relative humidity of 87%.
Throughout the year, there are 201.2 rainfall days, and 928mm (36.54") of precipitation is accumulated.
Months with snowfall are January through April, November and December.
The month with the most snowfall is January, when snow falls for 20.6 days and typically aggregates up to 398mm (15.67") of snow.
In Iiyama, during the entire year, snow falls for 64.2 days and aggregates up to 1179mm (46.42") of snow.
With an average of 5h of sunshine, January has the least sunshine of the year.
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.
May is the least humid month, with an average relative humidity of 72%.
In Iiyama, snow does not fall in May through October.
With an average of 14h and 36min of daylight, June has the longest days of the year.
The month with the most rainfall in Iiyama is July, when the rain falls for 24.9 days and typically aggregates up to 160mm (6.3") of precipitation.
With an average maximum UV index of 6, July is the month with the highest UV index.
The highest temperatures are recorded in August, with averages reaching a high of 27.8°C (82°F) and a low of 17.7°C (63.9°F).
August has the most sunshine of the year in Iiyama, Japan, with an average of 10.4h of sunshine.
November is the month with the least rainfall. Rain falls for 16.5 days and accumulates 47mm (1.85") of precipitation.
With an average of 9h and 42min of daylight, December has the shortest days of the year.
Iiyama does not utilize Daylight Saving Time (DST). JST timezone is used throughout the entire year.
Average temperature
Iiyama, Japan
The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (0.8°C).
The month with the highest average low temperature is August (17.7°C).
The coldest month (with the lowest average low temperature) is January (-6.5°C).
Average pressure
Iiyama, Japan
- Average pressure in January:
1017.9mbar - Average pressure in February:
1018.8mbar - Average pressure in March:
1016.8mbar - Average pressure in April:
1014.8mbar - Average pressure in May:
1012.2mbar - Average pressure in June:
1009.2mbar
- Average pressure in July:
1009.7mbar - Average pressure in August:
1010.4mbar - Average pressure in September:
1013.9mbar - Average pressure in October:
1017.5mbar - Average pressure in November:
1019.2mbar - Average pressure in December:
1017.6mbar
The month with the highest atmospheric pressure is November (1019.2mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed
Iiyama, Japan
- Average wind speed in January:
8.9km/h - Average wind speed in February:
8.6km/h - Average wind speed in March:
8.8km/h - Average wind speed in April:
8.4km/h - Average wind speed in May:
7.4km/h - Average wind speed in June:
6.3km/h
- Average wind speed in July:
5.8km/h - Average wind speed in August:
5.6km/h - Average wind speed in September:
6.6km/h - Average wind speed in October:
7.3km/h - Average wind speed in November:
7.5km/h - Average wind speed in December:
8.6km/h
The windiest month (with the highest average wind speed) is January (8.9km/h).
The calmest month (with the lowest average wind speed) is August (5.6km/h).
Average humidity
Iiyama, Japan
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is May (72%).
Average rainfall
Iiyama, Japan
The wettest month (with the highest rainfall) is July (160mm).
The driest month (with the least rainfall) is November (47mm).
Average rainfall days
Iiyama, Japan
- Average rainfall days in January:
10 days - Average rainfall days in February:
9.9 days - Average rainfall days in March:
14.5 days - Average rainfall days in April:
15.3 days - Average rainfall days in May:
15.8 days - Average rainfall days in June:
19.8 days
- Average rainfall days in July:
24.9 days - Average rainfall days in August:
24.2 days - Average rainfall days in September:
17.7 days - Average rainfall days in October:
16.4 days - Average rainfall days in November:
16.5 days - Average rainfall days in December:
16.2 days
The month with the highest number of rainy days is July (24.9 days).
The month with the least rainy days is February (9.9 days).
Average snowfall
Iiyama, Japan
The month with the highest snowfall is January (398mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Iiyama, Japan
- Average snowfall days in January:
20.6 days - Average snowfall days in February:
15.3 days - Average snowfall days in March:
10.3 days - Average snowfall days in April:
2.3 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:
1.3 days - Average snowfall days in December:
14.4 days
The month with the highest number of snowfall days is January (20.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Iiyama, Japan
- Average daylight in January:
10h and 0min - Average daylight in February:
10h and 48min - 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 36min
- Average daylight in July:
14h and 24min - 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 12min - Average daylight in December:
9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January:
5h and 0min - Average sunshine in February:
5h and 18min - Average sunshine in March:
7h and 6min - Average sunshine in April:
9h and 54min - Average sunshine in May:
10h and 18min - Average sunshine in June:
9h and 54min
- Average sunshine in July:
9h and 30min - Average sunshine in August:
10h and 24min - Average sunshine in September:
8h and 36min - Average sunshine in October:
7h and 18min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 24min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days
Iiyama, Japan
- Average sunshine days in January:
6.2 days - Average sunshine days in February:
7.7 days - Average sunshine days in March:
8.8 days - Average sunshine days in April:
10.8 days - Average sunshine days in May:
12.2 days - Average sunshine days in June:
8.3 days
- Average sunshine days in July:
4.3 days - Average sunshine days in August:
4.8 days - Average sunshine days in September:
9.1 days - Average sunshine days in October:
10.4 days - Average sunshine days in November:
10.6 days - Average sunshine days in December:
6.5 days
The month with the most sunshine days is May (12.2 days).
The month with the least sunshine days is July (4.3 days).
Average UV index
Iiyama, Japan
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Iiyama, Japan
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is May (Cloud cover 33).
Average visibility
Iiyama, Japan
The months with the highest visibility are April, May and November (9km).
The months with the lowest visibility are January, February, March, June, July, August, September, October and December (8km).
