April weather forecastJoetsu, Japan
April
Weather in April
April in Joetsu, Japan, is a cool spring month, with temperature in the range of an average high of 12.3°C (54.1°F) and an average low of 5.3°C (41.5°F).Temperature
Joetsu's transition into April sees a rise in the average high-temperature, advancing from a chilly 7°C (44.6°F) in March to a fresh 12.3°C (54.1°F). Throughout the month of April, the nighttime temperature in Joetsu dips to an average of 5.3°C (41.5°F).Humidity
In Joetsu, the average relative humidity in April is 76%.Rainfall
In April, in Joetsu, the rain falls for 15.5 days. Throughout April, 74mm (2.91") of precipitation is accumulated. Throughout the year, there are 200.6 rainfall days, and 1190mm (46.85") of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. April is the last month it regularly snows. During 0.8 snowfall days, in April, Joetsu aggregates 13mm (0.51") of snow. In Joetsu, during the entire year, snow falls for 50.4 days and aggregates up to 1229mm (48.39") of snow.Sea temperature
In Joetsu, the average seawater temperature in April is 11.6°C (52.9°F).Note: With an efficient thermal swimsuit, one can navigate 11.6°C (52.9°F) even if it's colder than 10°C (50°F); otherwise, rapid cold shock and breathlessness might set in. Barely wading at 13°C (55.4°F) feels chilly.
Daylight
The average length of the day in April is 13h and 9min.On the first day of the month, sunrise is at 05:32 and sunset at 18:09. On the last day of April, in Joetsu, Japan, sunrise is at 04:53 and sunset at 18:35 JST.
Sunshine
The average sunshine in April is 8.8h.UV index
In Joetsu, the average daily maximum UV index in April is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum UV index of 4 during April leads to these instructions:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Joetsu, Japan
- Average high temperature in April: 12.3°C
The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (2.8°C).
- Average low temperature in April: 5.3°C
The month with the highest average low temperature is August (20.9°C).
The coldest month (with the lowest average low temperature) is February (-1.9°C).
Average pressure in April
Joetsu, Japan
- Average pressure in April: 1014.9mbar
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 in April
Joetsu, Japan
- Average wind speed in April: 11.3km/h
The windiest months (with the highest average wind speed) are January and December (15.4km/h).
The calmest months (with the lowest average wind speed) are July and August (7.7km/h).
Average humidity in April
Joetsu, Japan
- Average humidity in April: 76%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is May (74%).
Average rainfall in April
Joetsu, Japan
- Average rainfall in April: 74mm
The wettest month (with the highest rainfall) is July (142mm).
The driest month (with the least rainfall) is May (57mm).
Average rainfall days in April
Joetsu, Japan
- Average rainfall days in April: 15.5 days
The month with the highest number of rainy days is July (21.6 days).
The month with the least rainy days is February (10.3 days).
Average snowfall in April
Joetsu, Japan
- Average snowfall in April: 13mm
The month with the highest snowfall is January (466mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in April
Joetsu, Japan
- Average snowfall days in April: 0.8 days
The month with the highest number of snowfall days is January (17.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in April
Joetsu, Japan
- Average sea temperature in April: 11.6°C
The best month for swimming (with the highest average sea temperature) is August (27°C).
The coldest month (with the lowest average sea temperature) is March (10.3°C).
Average daylight in April /
Average sunshine in April
Joetsu, Japan
- Average daylight in April: 13h and 12min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in April: 8h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 42min).
Average sunshine days in April
Joetsu, Japan
- Average sunshine days in April: 12.8 days
The month with the most sunshine days is May (15.1 days).
The month with the least sunshine days is January (4.3 days).
Average UV index in April
Joetsu, Japan
- Average UV index in April: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in April
Joetsu, Japan
- Average cloud cover in April: 41
The month with the most cloud cover is January (Cloud cover 74).
The month with the least cloud cover is May (Cloud cover 35).
Average visibility in April
Joetsu, Japan
- Average visibility in April: 9km
The months with the highest visibility are October and November (10km).
The month with the lowest visibility is January (8km).
