Kōriyama climate
Kōriyama (Japan) has a hot-summer humid continental climate (Köppen Dfa). The average temperature over the year is 12 °C53 °F, and about 1,302 mm51 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Kōriyama climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 337 | −424 | −131 | 642.5 | 30 |
| Feb | 439 | −425 | 032 | 451.8 | 27 |
| Mar | 847 | −130 | 439 | 793.1 | 25 |
| Apr | 1559 | 439 | 949 | 963.8 | 8 |
| May | 2169 | 1049 | 1559 | 1003.9 | 0 |
| Jun | 2476 | 1558 | 1967 | 1254.9 | 0 |
| Jul | 2882 | 1966 | 2374 | 1977.7 | 0 |
| Aug | 2984 | 2068 | 2576 | 1415.6 | 0 |
| Sep | 2576 | 1661 | 2069 | 1566.1 | 0 |
| Oct | 1965 | 949 | 1457 | 1596.2 | 0 |
| Nov | 1254 | 338 | 846 | 712.8 | 8 |
| Dec | 643 | −129 | 236 | 692.7 | 25 |
| Year | 2984 | −424 | 1253 | 1,30251 | 124 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 88% | 66% | 2.2 | 9:51 |
| Feb | 86% | 67% | 2.9 | 10:46 |
| Mar | 82% | 66% | 3.8 | 11:51 |
| Apr | 80% | 67% | 4.7 | 13:07 |
| May | 80% | 70% | 5.2 | 14:10 |
| Jun | 82% | 78% | 4.9 | 14:44 |
| Jul | 85% | 80% | 4.4 | 14:30 |
| Aug | 84% | 72% | 4.5 | 13:35 |
| Sep | 86% | 74% | 3.7 | 12:22 |
| Oct | 86% | 70% | 3.0 | 11:09 |
| Nov | 87% | 64% | 2.3 | 10:06 |
| Dec | 88% | 65% | 1.9 | 9:36 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Kōriyama is like
The warmest month is August, with an average high of 29 °C84 °F and a low of 20 °C68 °F. The coldest is January, when highs average 3 °C37 °F and lows −4 °C24 °F. Seasons are strongly marked: the warmest month is on average 25.2 °C45.4 °F warmer than the coldest.
It is wet, with about 1,302 mm51 in of precipitation per year. The wettest three-month stretch is July–September, which brings 38% of the annual total. The wettest month is July (197 mm7.7 in), the driest is February (45 mm1.8 in).
Relative humidity ranges from 80% in May to 88% in January. The clearest skies (lowest average cloud amount, 64%) are typical of November. Average wind speed near the ground ranges from 6 km/h (4 mph) in July to 10 km/h (6 mph) in March. Daylight lasts from about 9.6 hours in December to 14.7 hours in June.
A lasting snow cover is typical in December–March, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 17 cm).
Best time to visit Kōriyama
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May and June: average highs of 21 °C69 °F to 24 °C76 °F with 100 mm3.9 in to 125 mm4.9 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 3 °C37 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Kōriyama
- Winter (December–February) — highs 337 to 6 °C43 °F, lows −424 to −1 °C29 °F, about 59 mm2.3 in of precipitation a month. Pack a warm coat, layers and closed shoes and shoes with good grip, as frost is common.
- Spring (March–May) — highs 847 to 21 °C69 °F, lows −130 to 10 °C49 °F, about 92 mm3.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Summer (June–August) — highs 2476 to 29 °C84 °F, lows 1558 to 20 °C68 °F, about 154 mm6.1 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1254 to 25 °C76 °F, lows 338 to 16 °C61 °F, about 128 mm5.1 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
How Kōriyama compares
Compared with Iwaki, about 59 km to the southeast, Kōriyama is on average 2 °C3.7 °F cooler and receives 7% less precipitation (1,302 mm51 in vs 1,397 mm55 in). The difference is largest in January (2.7 °C4.8 °F cooler).
Of the 111 places in Japan covered by World Climates, Kōriyama is the 97th warmest by annual mean temperature and the 103rd wettest by annual precipitation. See all of them on the Japan climate page.
Places in other countries with the most similar temperature and rainfall pattern: Staten Island (United States, Dfa), Stamford (United States, Dfa) and Manhattan (United States, Dfa).
Nearby places
- Fukushima 40 km · 12 °C54 °F · 1,363 mm54 in
- Aizu-Wakamatsu 40 km · 12 °C54 °F · 1,349 mm53 in
- Nasushiobara 55 km · 12 °C54 °F · 1,405 mm55 in
- Iwaki 59 km · 14 °C57 °F · 1,397 mm55 in
- Yamagata 93 km · 10 °C51 °F · 1,363 mm54 in
- Utsunomiya 103 km · 13 °C56 °F · 1,474 mm58 in
- Sendai 105 km · 12 °C53 °F · 1,547 mm61 in
- Mito 117 km · 15 °C58 °F · 1,479 mm58 in
Frequently asked questions
What is the warmest month in Kōriyama?
August is the warmest month in Kōriyama, with an average high of 29 °C (84 °F) and an average low of 20 °C (68 °F).
What is the coldest month in Kōriyama?
January is the coldest month, with an average high of 3 °C (37 °F) and an average low of -4 °C (24 °F).
When does it rain the most in Kōriyama?
July is the wettest month with about 197 mm (7.7 in) of precipitation; February is the driest with about 45 mm (1.8 in).
What is the best time to visit Kōriyama?
Judging by long-term averages, the most comfortable months are May and June.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 392 m, while Kōriyama lies at about 236 m. Temperatures on this page were therefore adjusted by +1 °C1.8 °F using the standard lapse rate of 6.5 °C per 1,000 m.