Oued Sly weather in December

In December, Oued Sly sees average daytime highs of 16°C and overnight lows near 7°C, with 47 mm of rain across 7.5 wet days and about 9.6 hours of daylight. It is the 11th-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 16°C through the month. The sky is clear or mostly clear about 37% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of December to 9 h 36 min by month's end. Set against the rest of the year, December is Oued Sly's 11th-clearest and 7th-windiest month. For the whole year in context, see Oued Sly's year-round climate.

Daytime high
16°
11th warmest
Overnight low
3rd coldest
Rainfall
47 mm
7.5 wet days
Daylight
9 h 36 min
8:05 AM – 5:38 PM
Cloud cover
51%
11th clearest
Wind
8 km/h
7th windiest
Solar energy
2.31 kWh/m²
Travel score
5.4
out of 10

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 16°C through the month.

A typical December day in Oued Sly reaches about 16°C in the afternoon and slips back to 7°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 12°C and 20°C. Set against its neighbours, December runs about 4°C cooler than November and about 1°C warmer than January.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1178
2178
3178
4167
5167
6167
7167
8167
9167
10167
11167
12167
13167
14167
15167
16167
17167
18167
19167
20167
21167
22167
23166
24166
25166
26156
27156
28156
29156
30156
31156

How December really feels in Oued Sly

Once humidity and wind are folded in, December 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

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

Oued Sly weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan15° / 538.89.84.7
Feb16° / 498.510.65.3
Mar19° / 527.811.76.6
Apr22° / 10°507.812.97.2
May27° / 14°325.113.97.4
Jun32° / 18°71.514.45.0
Jul36° / 22°20.414.22.5
Aug36° / 22°61.713.42.6
Sep31° / 18°204.112.25.3
Oct26° / 14°315.411.17.6
Nov19° / 10°568.710.16.5
Dec16° / 477.59.65.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 18% of December, with mostly cloudy or overcast conditions the remaining 45%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25248
35248
45446
55446
65446
75446
85446
95545
105545
115545
125545
135545
145545
155545
165545
175545
185545
195545
205545
215545
225644
235644
245644
255644
265842
275842
285941
296040
306040
316139

Chance of precipitation in December

Any precipitation

Oued Sly gets around 47 mm of rain over 7.5 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 24% and peaks near 30% on the wettest days.

0%10%20%30%40%151015202531
Rain chance (%)
130
229
328
428
527
626
725
824
924
1023
1123
1223
1323
1423
1523
1623
1723
1823
1923
2024
2124
2224
2324
2424
2524
2624
2724
2824
2924
3024
3124

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 (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 8 km/h in December.

Across December, daily wind ranges from about 8 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
18calm
28calm
38calm
48calm
58calm
68calm
78calm
88calm
98calm
108calm
118calm
128calm
138calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 42 min at the start of December to 9 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:53 AM to 8:11 AM, and sunset from 5:37 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.77:535:37
29.77:545:37
39.77:555:36
49.77:565:36
59.77:575:36
69.67:575:36
79.67:585:36
89.67:595:37
99.68:005:37
109.68:015:37
119.68:015:37
129.68:025:37
139.68:035:37
149.68:035:38
159.68:045:38
169.68:055:38
179.68:055:38
189.58:065:39
199.58:065:39
209.58:075:40
219.58:075:40
229.58:085:40
239.58:085:41
249.58:095:41
259.58:095:42
269.58:105:43
279.68:105:43
289.68:105:44
299.68:115:44
309.68:115:45
319.68:115:46

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.31 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.31 kWh/m² to a high of 7.64 kWh/m² in July across the year — December's 2.31 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.4Moderate
22.4Moderate
32.4Moderate
42.4Moderate
52.4Moderate
62.4Moderate
72.3Moderate
82.3Moderate
92.3Moderate
102.3Moderate
112.3Moderate
122.3Moderate
132.3Moderate
142.3Moderate
152.3Moderate
162.3Moderate
172.3Moderate
182.3Moderate
192.3Moderate
202.3Moderate
212.3Moderate
222.3Moderate
232.3Moderate
242.3Moderate
252.3Moderate
262.4Moderate
272.4Moderate
282.4Moderate
292.4Moderate
302.4Moderate
312.5Moderate
Planning a trip in December

Hazard calendar for Oued Sly

In seasonPeak

None of Oued Sly's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Oued Sly sees seasonal dust haze (July–August), heaviest in July.

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

Is December a good time to visit Oued Sly?

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

5.4
Sightseeing
6th-best month of the year
0.6
Beach & pool
11th-best month of the year

December is a reasonable time to visit Oued Sly for sightseeing.

What to pack for Oued Sly in December

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

In December, Oued Sly sees daytime highs around 16°C and nights near 7°C. Worth packing: a warm layer. About 8 days see rain.

a warm layer

Sea temperature near Oued Sly in December

The nearest coast averages about 17°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 42 km away) is warmest in August at about 25°C and coldest in February near 15°C.

It's comfortable for a long swim from Jun 8 to Nov 1 — about 4.8 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°C)Comfort
Jan16Cool
Feb15Cool
Mar15Cool
Apr16Cool
May18Cool
Jun21Refreshing
Jul23Refreshing
Aug25Warm
Sep24Refreshing
Oct21Refreshing
Nov19Cool
Dec17Cool

UV index in Oued Sly 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 Oued Sly peaks around July 16 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 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 16UV 10Dec 19UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar7High
Apr7High
May8Very high
Jun9Very high
Jul10Very high
Aug8Very high
Sep7Very high
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Oued Sly 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 Oued Sly is worst in September — around 28 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateSep 1028 µg/m³Jan 1318 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb22Moderate
Mar27Moderate
Apr23Moderate
May19Moderate
Jun21Moderate
Jul26Moderate
Aug27Moderate
Sep28Moderate
Oct22Moderate
Nov19Moderate
Dec19Moderate
Location & terrain

Where is Oued Sly?

Oued Sly sits at 36.1°N, 1.2°E, 90 m above sea level, in Algeria. The nearest listed city is Boukadir, 8.0 km away.

Topography around Oued Sly

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

Within 3 km, the terrain around Oued Sly has only modest variations in elevation — a maximum elevation change of 167 m around an average of 104 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 653 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,916 m.

The land around Oued Sly is covered by trees (29%) and cropland (28%) within 3 km, cropland (41%) and grassland (39%) within 16 km, and grassland (30%), cropland (30%) and water (21%) within 80 km.

3 km
167 m
16 km
653 m
80 km
1,916 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Boukadir 8.0 km · Ech Chettia 12 km · Chlef 14 km · ’Aïn Merane 22 km · Mazouna 27 km · Ammi Moussa 27 km · Oued Rhiou 30 km · Oued Fodda 31 km

Algeria travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 33% of US
price level, 2025
GDP per capita
$6,051
2025
Happiness
5.7 / 10
World Happiness, 2025
Safe drinking water
69%
of population, 2024
Homicide rate
1.2
per 100k, 2023
Road deaths
20.9
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 468
Religion
Muslim 99%

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 Oued Sly (36.1012°, 1.1995°, elevation 90 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).