Siegen weather in January

In January, Siegen sees average daytime highs of 3°C and overnight lows near -2°C, with 100 mm of precipitation across 14.6 wet days and about 8.2 hours of daylight. It is the 12th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 3°C through the month. The sky is clear or mostly clear about 12% of the time in January, and the air most often feels dry.

Daylight stretches from about 7 h 48 min at the start of January to 8 h 48 min by month's end. Set against the rest of the year, January is Siegen's 10th-clearest and 1st-windiest month. For the whole year in context, see Siegen's year-round climate.

Daytime high
12th warmest
Overnight low
-2°
2nd coldest
Precipitation
100 mm
14.6 wet days
Daylight
8 h 12 min
8:32 AM – 4:43 PM
Cloud cover
78%
10th clearest
Wind
14 km/h
1st windiest
Solar energy
0.8 kWh/m²
Travel score
0.0
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 3°C through the month.

A typical January day in Siegen reaches about 3°C in the afternoon and slips back to -2°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between -3°C and 8°C. Set against its neighbours, January runs on par with December and about 1°C cooler than February.

-10°-5°10°151015202531
Avg high (°C)Avg low (°C)
13-1
23-1
33-1
43-1
53-1
63-1
73-1
83-1
93-1
103-1
113-1
123-1
133-1
143-1
153-1
163-1
173-1
183-2
193-2
203-2
213-2
222-2
232-2
242-2
252-2
262-2
272-2
282-2
293-2
303-2
313-2

How January really feels in Siegen

Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 31 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
31
wind chill below the day's low

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Siegen weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -2°10014.65.78.20.0
Feb / -2°79125.99.70.0
Mar / 8213.73.611.51.2
Apr13° / 6211.7113.53.3
May17° / 7212.6015.24.9
Jun20° / 11°7612.8016.25.7
Jul22° / 13°8314.2015.86.0
Aug21° / 13°8113.1014.36.0
Sep17° / 10°7611.6012.45.1
Oct12° / 8012.90.110.42.9
Nov / 8513.42.18.70.7
Dec / -0°10915.86.17.80.0

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 8% of January, with mostly cloudy or overcast conditions the remaining 80%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11684
21684
31783
41783
51882
61882
72080
82080
92179
102179
112179
122179
132179
142179
152278
162278
172278
182179
192179
202278
212278
222179
232278
242278
252179
262179
272179
282278
292278
302278
312278

Chance of precipitation in January

Any precipitationSnow

Siegen gets around 100 mm of rain and snow over 14.6 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 47% and peaks near 53% on the wettest days, and about 6 days bring snow. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
15318
25217
35217
45216
55116
65115
75015
84915
94915
104815
114815
124715
134716
144617
154617
164618
174519
184519
194520
204521
214522
224522
234523
244523
254524
264524
274524
284424
294424
304424
314424

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 14 km/h in January, the windiest month of the year.

Across January, daily wind ranges from about 14 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in January

DaylightNight

Daylight runs from about 7 h 48 min at the start of January to 8 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over January. Sunrise moves from 8:38 AM to 8:16 AM, and sunset from 4:25 PM to 5:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
17.88:384:25
27.88:374:26
37.88:374:27
47.88:374:28
57.98:374:29
67.98:374:30
77.98:374:31
87.98:364:32
98.08:364:33
108.08:354:34
118.08:354:36
128.08:344:37
138.18:344:38
148.18:334:40
158.18:324:41
168.28:324:43
178.28:314:44
188.38:304:46
198.38:294:47
208.38:284:49
218.48:284:50
228.48:274:52
238.58:264:53
248.58:244:55
258.68:234:56
268.68:224:58
278.68:215:00
288.78:205:01
298.78:195:03
308.88:175:05
318.88:165:06

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 0.8 kWh/m².

For context, solar energy here swings from a low near 0.59 kWh/m² to a high of 5.32 kWh/m² in June across the year — January's 0.8 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.6Dim
20.6Dim
30.6Dim
40.6Dim
50.6Dim
60.7Dim
70.7Dim
80.7Dim
90.7Dim
100.7Dim
110.7Dim
120.7Dim
130.8Dim
140.8Dim
150.8Dim
160.8Dim
170.8Dim
180.8Dim
190.8Dim
200.9Dim
210.9Dim
220.9Dim
230.9Dim
240.9Dim
251.0Dim
261.0Dim
271.0Dim
281.0Dim
291.1Dim
301.1Dim
311.1Dim
Planning a trip in January

Is January a good time to visit Siegen?

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

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
8th-best month of the year

January is a weaker month for outdoor sightseeing in Siegen.

What to pack for Siegen in January

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

In January, Siegen sees daytime highs around 3°C and nights near -2°C. Pack a warm layer, a heavy coat and rain gear. About 15 days see rain.

a warm layera heavy coatrain gear

UV index in Siegen in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Siegen peaks around July 14 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 22 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJul 14UV 7Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar3Moderate
Apr4Moderate
May6High
Jun6High
Jul7High
Aug6High
Sep4Moderate
Oct2Moderate
Nov1Low
Dec1Low
Location & terrain

Where is Siegen?

Siegen sits at 50.9°N, 8.0°E, 272 m above sea level, in Germany. The nearest listed city is Netphen, 7.0 km away.

Topography around Siegen

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

Within 3 km, the terrain around Siegen has only modest variations in elevation — a maximum elevation change of 202 m around an average of 312 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 509 m; within 80 km, large variations in elevation — a maximum elevation change of 850 m.

The land around Siegen is covered by trees (66%) and artificial surfaces (28%) within 3 km, trees (76%) within 16 km, and trees (59%) and grassland (20%) within 80 km.

3 km
202 m
16 km
509 m
80 km
850 m
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Netphen 7.0 km · Wilnsdorf 8.0 km · Kreuztal 11 km · Freudenberg 11 km · Hilchenbach 15 km · Haiger 20 km · Olpe 21 km · Dillenburg 24 km

Germany travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 80% of US
price level, 2025
GDP per capita
$60,496
2025
Happiness
6.9 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
0.9
per 100k, 2023
Road deaths
3.8
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 615
Religion
none 44%Roman Catholic 25%Protestant 23%other 5%

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 Siegen (50.8748°, 8.0243°, elevation 272 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).