Climate Insights for Ōmamachō-ōmama

Midori Shi, Gunma-ken, Japan

Hottest
August
29°C peak
Coldest
January
-2°C low
Wettest
July
217mm rain
Best to Visit
Varies throughout year

Climate Overview

The climate in Ōmamachō-ōmama is temperate. The average annual temperature is 13°C and approximately 1528mm of precipitation falls per year. Ōmamachō-ōmama receives a notable amount of rainfall throughout the year, including during its driest month. Ōmamachō-ōmama is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to -2°C. Snowfall occurs from January to December, with around 71cm accumulating over the season.

Temperature

-10° 10° 20° 30° Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Max: 6° Average: 2° Min: -2° Feb Max: 7° Average: 3° Min: -1° Mar Max: 11° Average: 7° Min: 3° Apr Max: 16° Average: 12° Min: 7° May Max: 21° Average: 17° Min: 12° Jun Max: 24° Average: 20° Min: 17° Jul Max: 28° Average: 24° Min: 21° Aug Max: 29° Average: 25° Min: 22° Sep Max: 25° Average: 21° Min: 19° Oct Max: 19° Average: 15° Min: 12° Nov Max: 14° Average: 9° Min: 5° Dec Max: 8° Average: 4° Min: 0°
Max
Average
Min

Temperatures in Ōmamachō-ōmama vary considerably across the year, with a 31°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 25°C. The coldest month is January, when overnight lows fall to -2°C and the daily average is 2°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Precipitation

0mm 50mm 100mm 150mm 200mm 250mm Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Precipitation: 48mm Snow: 21mm Feb Precipitation: 49mm Snow: 16mm Mar Precipitation: 112mm Snow: 21mm Apr Precipitation: 126mm Snow: 5mm May Precipitation: 145mm Snow: 0mm Jun Precipitation: 174mm Snow: 0mm Jul Precipitation: 217mm Snow: 0mm Aug Precipitation: 196mm Snow: 0mm Sep Precipitation: 187mm Snow: 0mm Oct Precipitation: 173mm Snow: 0mm Nov Precipitation: 63mm Snow: 1mm Dec Precipitation: 37mm Snow: 7mm
Precipitation
Snow

Ōmamachō-ōmama is a fairly wet location, receiving approximately 1528mm of precipitation annually, which averages out to around 127mm per month. The wettest month is July, averaging 217mm of rainfall. August and September also tend to see above-average precipitation. The driest month is December, with just 37mm. That's 180mm less than July, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Snowfall is a regular feature from January to December, with around 71cm accumulating over the season. January typically sees the most snow at around 21cm.

Wind

0km/h 5km/h 10km/h Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Wind Speed: 8km/h Feb Wind Speed: 9km/h Mar Wind Speed: 8km/h Apr Wind Speed: 7km/h May Wind Speed: 6km/h Jun Wind Speed: 5km/h Jul Wind Speed: 4km/h Aug Wind Speed: 5km/h Sep Wind Speed: 4km/h Oct Wind Speed: 5km/h Nov Wind Speed: 6km/h Dec Wind Speed: 8km/h
Wind Speed

Ōmamachō-ōmama is relatively calm, with an average annual wind speed of 6km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 8km/h in winter, 7km/h in spring, 5km/h in summer, 5km/h in autumn.

Seasons

Winter
Dec 21
Spring
Mar 20
Summer
Jun 21
Autumn
Sep 23

3 days until Autumn

It is currently summer in Ōmamachō-ōmama, which began on June 21, 2026. Ōmamachō-ōmama is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 29°C, while the coldest stretch bottoms out in January near -2°C. Autumn is next, beginning on September 23, 2026 (3 days from now).

Spring

Temperatures range from 3 to 21°C. Rainfall is heavy, totalling around 383mm across the season with a monthly average of 128mm. Winds are generally light, averaging 7km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.

Summer

Temperatures range from 17 to 29°C. Rainfall is heavy, totalling around 588mm across the season with a monthly average of 196mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.

Autumn

Temperatures range from 5 to 25°C. Rainfall is heavy, totalling around 423mm across the season with a monthly average of 141mm. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.

Winter

Temperatures range from -2 to 8°C. Rainfall is relatively light, with around 134mm over the season and a monthly average of 45mm. Expect around 45cm of snow accumulation during this period. Winds are generally light, averaging 8km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.

Monthly Climate Data

The table below shows monthly climate averages for Ōmamachō-ōmama based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.

Month
Min Temperature
Max Temperature
Wind Speed
Precipitation
Snow
Jan
-2 °C
6 °C
8 km/h
48 mm
21 cm
Feb
-1 °C
7 °C
9 km/h
49 mm
16 cm
Mar
3 °C
11 °C
8 km/h
112 mm
21 cm
Apr
7 °C
16 °C
7 km/h
126 mm
5 cm
May
12 °C
21 °C
6 km/h
145 mm
0 cm
Jun
17 °C
24 °C
5 km/h
174 mm
0 cm
Jul
21 °C
28 °C
4 km/h
217 mm
0 cm
Aug
22 °C
29 °C
5 km/h
196 mm
0 cm
Sep Current
19 °C
25 °C
4 km/h
187 mm
0 cm
Oct
12 °C
19 °C
5 km/h
173 mm
0 cm
Nov
5 °C
14 °C
6 km/h
63 mm
1 cm
Dec
0 °C
8 °C
8 km/h
37 mm
7 cm
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Metric (°C, km/h)