Climate and monthly weather forecastKoyasu, Japan
Climate and monthly weather forecast
Weather in January
January, like December, is another chilly winter month in Koyasu, Japan, with an average temperature ranging between min 5.3°C (41.5°F) and max 9.8°C (49.6°F). Koyasu's January weather, with an average high temperature of 9.8°C (49.6°F) and an average low temperature of 5.3°C (41.5°F), tends to be the coldest of the year. Weather in January »Weather in February
February, the last month of the winter in Koyasu, is a fresh month, with an average temperature fluctuating between 10.4°C (50.7°F) and 5.8°C (42.4°F). The start of February sees the average high-temperature at a cool 10.4°C (50.7°F), showing little difference from January's 9.8°C (49.6°F). Weather in February »Weather in March
March, the first month of the spring in Koyasu, is a mild month, with an average temperature varying between 8.1°C (46.6°F) and 13.3°C (55.9°F). March's arrival shows an average high-temperature of a refreshing 13.3°C (55.9°F), hardly different from the previous month. Weather in March »Weather in April
April is a comfortable spring month in Koyasu, Japan, with an average temperature ranging between min 12.1°C (53.8°F) and max 17°C (62.6°F). As Koyasu welcomes April, the average high-temperature sees a modest rise, transitioning from a refreshing 13.3°C (55.9°F) in March to a comfortable 17°C (62.6°F). Weather in April »Weather in May
May, the last month of the spring in Koyasu, is an agreeable month, with an average temperature fluctuating between 17°C (62.6°F) and 21.2°C (70.2°F). In Koyasu, the onset of May comes with a modest high-temperature shift, transitioning from April's enjoyable 17°C (62.6°F) to an agreeable 21.2°C (70.2°F). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Koyasu, Japan, with an average temperature varying between 23.4°C (74.1°F) and 19.8°C (67.6°F). With June's arrival, Koyasu notes an average high-temperature of a warm 23.4°C (74.1°F), closely following the trend of the preceding month. Weather in June »Weather in July
July, the same as June, is a moderately hot summer month in Koyasu, Japan, with temperature in the range of an average low of 23.4°C (74.1°F) and an average high of 27.2°C (81°F). The shift into July is accompanied by a modest temperature increase, with the average high-temperature edging up from a moderately hot 23.4°C (74.1°F) in June to a still warm 27.2°C (81°F). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Koyasu, Japan, with an average temperature ranging between min 25.3°C (77.5°F) and max 28.8°C (83.8°F). In Koyasu, the average temperatures in August are the highest, with a peak at 28.8°C (83.8°F) and a low of 25.3°C (77.5°F). The heat index value during August is computed to be a hot 34°C (93.2°F). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Koyasu, Japan, with an average temperature ranging between min 22.3°C (72.1°F) and max 26.1°C (79°F). The average high-temperature during September is a still warm 26.1°C (79°F), almost matching the conditions of the preceding month. Weather in September »Weather in October
October, the same as September, in Koyasu, Japan, is another pleasant autumn month, with an average temperature fluctuating between 21.7°C (71.1°F) and 17.9°C (64.2°F). October's arrival comes with a mild decrease in the average high-temperature, moving subtly from a moderately hot 26.1°C (79°F) in September to a pleasant 21.7°C (71.1°F). Weather in October »Weather in November
November, the last month of the autumn in Koyasu, is also an enjoyable month, with temperature in the range of an average low of 13.2°C (55.8°F) and an average high of 17.1°C (62.8°F). As October makes way for November, Koyasu's average high-temperature eases from a pleasant 21.7°C (71.1°F) to a comfortable 17.1°C (62.8°F). Weather in November »Weather in December
December, the first month of the winter in Koyasu, is still a cool month, with an average temperature varying between 12.5°C (54.5°F) and 8.4°C (47.1°F). A minor decrease in the average high-temperature is observed during December, shifting from a comfortable 17.1°C (62.8°F) in November to a cool 12.5°C (54.5°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
Koyasu's coldest month, January, generally records average temperatures ranging from a high of 9.8°C (49.6°F) to a low of 5.3°C (41.5°F).
With an average relative humidity of 61%, January is the least humid month.
In Koyasu, Japan, during the entire year, the rain falls for 151.7 days and collects up to 886mm (34.88") of precipitation.
January through March are months with snowfall in Koyasu.
In Koyasu, Japan, during the entire year, snow falls for 0.7 days and aggregates up to 17mm (0.67") of snow.
The months with the lowest UV index are January, February and December, with an average maximum UV index of 3.
February and December are months with the least rain when the rain falls for 10 days and typically aggregates up to 39mm (1.54") of rain.
The month with the most snowfall in Koyasu, Japan, is February, when snow falls for 0.5 days and typically aggregates up to 10mm (0.39") of snow.
With an average of 5.5h of sunshine, February has the least sunshine of the year in Koyasu.
In Koyasu, Japan, snow does not fall in April through December.
With an average of 14h and 30min of daylight, June has the longest days of the year.
The most humid month in Koyasu, Japan, is July, with an average relative humidity of 83%.
July is the month with the highest UV index in Koyasu, Japan, with an average maximum UV index of 7.
The average temperatures in Koyasu reach their apex in August, averaging 28.8°C (83.8°F) at the high end and 25.3°C (77.5°F) at the low end.
The month with the most sunshine in Koyasu, Japan, is August, with an average of 10.7h of sunshine.
The month with the most rainfall in Koyasu, Japan, is September, when the rain falls for 16 days and typically aggregates up to 125mm (4.92") of precipitation.
The month with the shortest days is December, with an average of 9h and 48min of daylight.
Koyasu, Japan, does not utilize Daylight Saving Time (DST). JST timezone is used over the entire year.
Average temperature
Koyasu, Japan
The warmest month (with the highest average high temperature) is August (28.8°C).
The month with the lowest average high temperature is January (9.8°C).
The month with the highest average low temperature is August (25.3°C).
The coldest month (with the lowest average low temperature) is January (5.3°C).
Average pressure
Koyasu, Japan
- Average pressure in January:
1016.1mbar - Average pressure in February:
1016.9mbar - Average pressure in March:
1015.3mbar - Average pressure in April:
1014.2mbar - Average pressure in May:
1012mbar - Average pressure in June:
1009.1mbar
- Average pressure in July:
1009.8mbar - Average pressure in August:
1010.1mbar - Average pressure in September:
1013.2mbar - Average pressure in October:
1016.3mbar - Average pressure in November:
1017.9mbar - Average pressure in December:
1016.2mbar
The month with the highest atmospheric pressure is November (1017.9mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed
Koyasu, Japan
- Average wind speed in January:
19km/h - Average wind speed in February:
20km/h - Average wind speed in March:
20.8km/h - Average wind speed in April:
20.1km/h - Average wind speed in May:
17.7km/h - Average wind speed in June:
15.9km/h
- Average wind speed in July:
17.5km/h - Average wind speed in August:
16.7km/h - Average wind speed in September:
17.3km/h - Average wind speed in October:
18.9km/h - Average wind speed in November:
17.7km/h - Average wind speed in December:
19.1km/h
The windiest month (with the highest average wind speed) is March (20.8km/h).
The calmest month (with the lowest average wind speed) is June (15.9km/h).
Average humidity
Koyasu, Japan
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is January (61%).
Average rainfall
Koyasu, Japan
The wettest month (with the highest rainfall) is September (125mm).
The driest months (with the least rainfall) are February and December (39mm).
Average rainfall days
Koyasu, Japan
- Average rainfall days in January:
6.5 days - Average rainfall days in February:
10 days - Average rainfall days in March:
13.9 days - Average rainfall days in April:
13.6 days - Average rainfall days in May:
11.6 days - Average rainfall days in June:
16.5 days
- Average rainfall days in July:
14 days - Average rainfall days in August:
13.1 days - Average rainfall days in September:
16 days - Average rainfall days in October:
15.5 days - Average rainfall days in November:
12.3 days - Average rainfall days in December:
8.7 days
The month with the highest number of rainy days is June (16.5 days).
The month with the least rainy days is January (6.5 days).
Average snowfall
Koyasu, Japan
The month with the highest snowfall is February (10mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days
Koyasu, Japan
- Average snowfall days in January:
0.1 days - Average snowfall days in February:
0.5 days - Average snowfall days in March:
0.1 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 days
The month with the highest number of snowfall days is February (0.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight / Average sunshine
Koyasu, Japan
- Average daylight in January:
10h and 6min - 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 0min - 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 24min - Average sunshine in February:
5h and 30min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 54min - Average sunshine in May:
9h and 30min - Average sunshine in June:
8h and 48min
- Average sunshine in July:
9h and 48min - Average sunshine in August:
10h and 42min - Average sunshine in September:
8h and 0min - Average sunshine in October:
6h and 48min - Average sunshine in November:
5h and 54min - Average sunshine in December:
6h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).
Average sunshine days
Koyasu, Japan
- Average sunshine days in January:
23.2 days - Average sunshine days in February:
16.1 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
13.5 days - Average sunshine days in May:
17.3 days - Average sunshine days in June:
11.4 days
- Average sunshine days in July:
15.7 days - Average sunshine days in August:
15 days - Average sunshine days in September:
11.2 days - Average sunshine days in October:
12.8 days - Average sunshine days in November:
15.2 days - Average sunshine days in December:
21.3 days
The month with the most sunshine days is January (23.2 days).
The month with the least sunshine days is September (11.2 days).
Average UV index
Koyasu, Japan
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover
Koyasu, Japan
The months with the most cloud cover are March, June and October (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Koyasu, Japan
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
