Geyve weather in December

In December, Geyve sees average daytime highs of 8°C and overnight lows near 1°C, with 87 mm of precipitation across 12.2 wet days and about 9.2 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 10°C in the first days to 7°C by the end. The sky is clear or mostly clear about 22% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of December to 9 h 06 min by month's end. Set against the rest of the year, December is Geyve's 11th-clearest and 6th-windiest month. For the whole year in context, see Geyve's year-round climate.

Daytime high
11th warmest
Overnight low
3rd coldest
Precipitation
87 mm
12.2 wet days
Daylight
9 h 06 min
7:21 AM – 4:29 PM
Cloud cover
68%
11th clearest
Wind
6 km/h
6th windiest
Solar energy
1.59 kWh/m²
Travel score
1.4
out of 10

Geyve is ilçe (district), administrative county of Sakarya, northwestern Turkey.

Density
31/km²
people per km²

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 10°C in the first days to 7°C by the end.

A typical December day in Geyve reaches about 8°C in the afternoon and slips back to 1°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 3°C and 14°C. Set against its neighbours, December runs about 6°C cooler than November and about 2°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1113
2113
3102
4102
5102
6102
7102
892
992
1092
1191
1291
1381
1481
1581
1681
1781
1881
1981
2081
2181
2280
2370
2470
2570
2670
2770
2870
2970
3070
3170

How December really feels in Geyve

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 23 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
23
wind chill below the day's low

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

Geyve weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -1°8312.37.19.40.7
Feb / 7612.66.210.41.5
Mar12° / 8913.2411.73.0
Apr17° / 7411.50.7135.2
May22° / 11°7311.2014.26.6
Jun25° / 15°6810.6014.87.0
Jul28° / 17°315.4014.67.3
Aug28° / 17°305.6013.66.9
Sep25° / 14°457.6012.37.6
Oct20° / 10°709.2010.96.5
Nov14° / 649.31.39.74.1
Dec / 8712.24.79.21.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 11% of December, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23862
33763
43763
53565
63565
73565
83565
93466
103466
113466
123466
133367
143367
153367
163268
173268
183268
193367
203268
213268
223367
233268
243268
253169
263169
273169
283070
293070
303070
313070

Chance of precipitation in December

Any precipitationSnow

Geyve gets around 87 mm of rain and snow over 12.2 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 40% and peaks near 43% on the wettest days, and about 5 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1378
2388
3389
4399
53910
63911
73911
83912
93913
103914
114014
124015
134015
144016
154016
164017
174017
184017
194017
204017
214018
224018
234118
244118
254119
264119
274220
284220
294221
304321
314322

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, December 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 December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 18 min at the start of December to 9 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:09 AM to 7:28 AM, and sunset from 4:28 PM to 4:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:094:28
29.37:104:28
39.37:114:28
49.37:124:28
59.27:134:28
69.27:144:27
79.27:154:27
89.27:154:27
99.27:164:27
109.27:174:27
119.27:184:28
129.27:194:28
139.17:194:28
149.17:204:28
159.17:214:28
169.17:214:29
179.17:224:29
189.17:234:29
199.17:234:30
209.17:244:30
219.17:244:30
229.17:254:31
239.17:254:31
249.17:264:32
259.17:264:32
269.17:264:33
279.17:274:34
289.17:274:34
299.17:274:35
309.17:284:36
319.17:284:36

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.59 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.59 kWh/m² to a high of 6.78 kWh/m² in July across the year — December's 1.59 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.8Dim
21.7Dim
31.7Dim
41.7Dim
51.7Dim
61.7Dim
71.6Dim
81.6Dim
91.6Dim
101.6Dim
111.6Dim
121.6Dim
131.6Dim
141.6Dim
151.6Dim
161.6Dim
171.6Dim
181.6Dim
191.6Dim
201.6Dim
211.6Dim
221.6Dim
231.6Dim
241.6Dim
251.6Dim
261.6Dim
271.6Dim
281.6Dim
291.6Dim
301.6Dim
311.6Dim
Planning a trip in December

Is December a good time to visit Geyve?

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

1.4
Sightseeing
11th-best month of the year
0.0
Beach & pool
10th-best month of the year

December is a weaker month for outdoor sightseeing in Geyve.

What to pack for Geyve in December

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

In December, Geyve sees daytime highs around 8°C and nights near 1°C. Pack a warm layer. Worth having: rain gear. About 12 days see rain.

a warm layerrain gear

Sea temperature near Geyve in December

The nearest coast averages about 11°C in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 70 km away) is warmest in August at about 25°C and coldest in February near 7°C.

It's comfortable for a long swim from Jun 11 to Oct 10 — about 4 months when the water holds above 20°C.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan9Bracing
Feb7Bracing
Mar8Bracing
Apr10Bracing
May16Cool
Jun21Refreshing
Jul24Warm
Aug25Warm
Sep23Refreshing
Oct19Cool
Nov15Cool
Dec11Bracing

UV index in Geyve in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Geyve peaks around August 10 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowAug 10UV 9Dec 20UV 2
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar3Moderate
Apr7High
May7Very high
Jun9Very high
Jul9Very high
Aug9Very high
Sep6High
Oct4Moderate
Nov2Moderate
Dec2Low

Air quality in Geyve in December

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Geyve is worst in March — around 16 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (December, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodMar 2316 µg/m³Dec 198 µg/m³
PM2.5 (µg/m³)Level
Jan9Good
Feb11Good
Mar16Moderate
Apr16Moderate
May15Moderate
Jun13Moderate
Jul10Good
Aug10Good
Sep10Good
Oct10Good
Nov10Good
Dec8Good
Location & terrain

Where is Geyve?

Geyve sits at 40.5°N, 30.3°E, 84 m above sea level, in Turkey. The nearest listed city is Sapanca, 21 km away.

Topography around Geyve

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

Within 3 km, the terrain around Geyve has significant variations in elevation — a maximum elevation change of 290 m around an average of 113 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,484 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,820 m.

The land around Geyve is covered by trees (50%) within 3 km, trees (73%) within 16 km, and trees (61%) within 80 km.

3 km
290 m
16 km
1,484 m
80 km
1,820 m
treesgrasslandcroplandartificial surfaceswater
December weather nearby: Sapanca 21 km · Osmaneli 29 km · Adapazarı 32 km · Akyazı 34 km · İzmit 42 km · Gölcük 46 km · Bilecik 49 km · Derince 49 km

Turkey travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 41% of US
price level, 2025
GDP per capita
$18,599
2025
Happiness
5.3 / 10
World Happiness, 2025
Homicide rate
3.2
per 100k, 2023
Road deaths
6.7
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 488
Religion
Muslim 100%other 0%

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 Geyve (40.5075°, 30.2925°, elevation 84 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).