Annaka weather in April

In April, Annaka sees average daytime highs of 17°C and overnight lows near 8°C, with 148 mm of precipitation across 14.7 wet days and about 12.9 hours of daylight. It is the 7th-warmest and 7th-wettest month of the year here.

Highs climb over the month, from about 15°C in the first days to 19°C by the end. The sky is clear or mostly clear about 32% of the time in April, and the air most often feels dry.

Daylight stretches from about 12 h 18 min at the start of April to 13 h 24 min by month's end. Set against the rest of the year, April is Annaka's 6th-clearest and 4th-windiest month. For the whole year in context, see Annaka's year-round climate.

Daytime high
17°
7th warmest
Overnight low
6th coldest
Precipitation
148 mm
14.7 wet days
Daylight
12 h 54 min
5:17 AM – 6:12 PM
Cloud cover
60%
6th clearest
Wind
7 km/h
4th windiest
Solar energy
5.12 kWh/m²
Travel score
4.9
out of 10

Annaka is city in Gunma Prefecture, Japan.

Density
206/km²
people per km²
Founded
1958

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in April

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 15°C in the first days to 19°C by the end.

A typical April day in Annaka reaches about 17°C in the afternoon and slips back to 8°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 23°C. Set against its neighbours, April runs about 5°C warmer than March and about 4°C cooler than May.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
1155
2155
3155
4155
5156
6166
7166
8166
9166
10167
11177
12177
13177
14177
15178
16178
17188
18188
19188
20189
21189
22189
23199
24199
25199
261910
271910
281910
292010
302010

How April really feels in Annaka

Once humidity and wind are folded in, April averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

April sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Annaka weather by month

How April compares with the rest of the year at a glance. April is the 7th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°688.53.89.81.4
Feb / -0°719.64.110.61.6
Mar12° / 13114.43.311.73.0
Apr17° / 14814.70.412.94.9
May22° / 13°17816013.95.6
Jun24° / 17°23920.7014.44.9
Jul28° / 21°28823.2014.24.2
Aug29° / 22°22522.1013.44.1
Sep25° / 18°25719.8012.25.1
Oct20° / 12°22516.9011.15.3
Nov15° / 859.90.110.14.6
Dec10° / 618.31.19.62.6

Cloud cover in April

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in April.

Beyond those clear spells, partly cloudy skies cover about 14% of April, with mostly cloudy or overcast conditions the remaining 54%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15050
24951
34951
44951
54951
64951
74852
84852
94852
104654
114654
124555
134555
144555
154654
164555
174555
184555
194555
204555
214654
224654
234654
244654
254753
264753
274654
284654
294654
304654

Chance of precipitation in April

Any precipitationSnow

Annaka gets around 148 mm of rain and snow over 14.7 wet days in April. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 49% and peaks near 51% on the wettest days, and about 0 day brings snow.

0%20%40%60%151015202530
Rain chance (%)Snow chance (%)
1484
2484
3484
4483
5483
6483
7492
8492
9492
10502
11502
12502
13511
14511
15511
16511
17511
18511
19511
20511
21501
22501
23501
24490
25490
26490
27490
28480
29480
30480

Humidity in April

DryComfortableHumidMuggyOppressiveMiserable

Most of April feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, April lands in the dry band about 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
110000
210000
310000
410000
510000
610000
710000
810000
910000
1010000
1110000
1210000
139901
149811
159811
169811
179811
189811
199811
209721
219721
229631
239631
249541
259451
269361
279271
289181
299091
3089101

Wind in April

Winds average 7 km/h in April.

Across April, daily wind ranges from about 7 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in April

DaylightNight

Daylight runs from about 12 h 18 min at the start of April to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over April. Sunrise moves from 5:39 AM to 4:59 AM, and sunset from 5:59 PM to 6:25 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:395:59
212.45:376:00
312.45:366:01
412.55:346:02
512.55:336:03
612.55:316:04
712.65:306:05
812.65:286:05
912.75:276:06
1012.75:256:07
1112.75:246:08
1212.85:236:09
1312.85:216:10
1412.85:206:11
1512.95:186:11
1612.95:176:12
1713.05:166:13
1813.05:146:14
1913.05:136:15
2013.15:116:16
2113.15:106:17
2213.15:096:18
2313.25:086:18
2413.25:066:19
2513.35:056:20
2613.35:046:21
2713.35:036:22
2813.45:016:23
2913.45:006:24
3013.44:596:25

Solar energy in April

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in April, about 5.12 kWh/m².

For context, solar energy here swings from a low near 2.44 kWh/m² to a high of 5.31 kWh/m² in May across the year — April's 5.12 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.9Bright
55.0Bright
65.0Bright
75.0Bright
85.0Bright
95.0Bright
105.0Bright
115.0Bright
125.0Bright
135.1Bright
145.1Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.1Bright
205.1Bright
215.2Bright
225.2Bright
235.2Bright
245.2Bright
255.2Bright
265.3Bright
275.3Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in April

Hazard calendar for Annaka

In seasonPeak

In April, Annaka sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Annaka's rainy season runs March–October, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is April a good time to visit Annaka?

Our two travel scores rate April for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

4.9
Sightseeing
4th-best month of the year
1.4
Beach & pool
7th-best month of the year

April is a reasonable time to visit Annaka for sightseeing.

What to pack for Annaka in April

From April's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In April, Annaka sees daytime highs around 17°C and nights near 8°C. Pack rain gear. Worth having: a warm layer and sun protection. About 15 days see rain.

rain geara warm layersun protection

UV index in Annaka in April

LowModerateHighVery highExtreme

Clear-sky midday UV in April peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Annaka peaks around July 18 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highModerateJul 18UV 10Dec 23UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar6High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug9Very high
Sep9Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Annaka in April

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where April falls, not just the annual average.

Air quality in Annaka is worst in April — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (December, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1821 µg/m³Dec 1810 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb14Moderate
Mar19Moderate
Apr21Moderate
May20Moderate
Jun18Moderate
Jul15Moderate
Aug14Moderate
Sep13Moderate
Oct12Moderate
Nov11Good
Dec10Good
Location & terrain

Where is Annaka?

Annaka sits at 36.3°N, 138.9°E, 170 m above sea level, in Japan. The nearest listed city is Tomioka, 8.0 km away.

Topography around Annaka

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Annaka.

Within 3 km, the terrain around Annaka has only modest variations in elevation — a maximum elevation change of 222 m around an average of 189 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,326 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,851 m.

The land around Annaka is covered by trees (45%) and artificial surfaces (25%) within 3 km, trees (60%) and artificial surfaces (23%) within 16 km, and trees (75%) within 80 km.

3 km
222 m
16 km
1,326 m
80 km
2,851 m
treesgrasslandcroplandartificial surfacesbare terrainwater
April weather nearby: Tomioka 8.0 km · Takasaki 11 km · Yoshii 12 km · Kanekomachi 13 km · Ogura 17 km · Fujioka 18 km · Maebashi 19 km · Shibukawa 19 km

Japan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B
100 V · 50 / 60 Hz
Prices
≈ 65% of US
price level, 2025
GDP per capita
$35,951
2025
Happiness
6.1 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.2
per 100k, 2023
Road deaths
3.6
per 100k/yr, 2019
Income group
High
World Bank
English
Very low
EF EPI 446
Religion
Shintoism 49%Buddhism 46%other 4%Christianity 1%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Annaka (36.3301°, 138.8958°, elevation 170 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).