Monterotondo weather in December

In December, Monterotondo sees average daytime highs of 12°C and overnight lows near 5°C, with 94 mm of precipitation across 10.6 wet days and about 9 hours of daylight. It is the 11th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 12°C by the end. The sky is clear or mostly clear about 40% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 12 min at the start of December to 9 hours by month's end. Set against the rest of the year, December is Monterotondo's 8th-clearest and 2nd-windiest month. For the whole year in context, see Monterotondo's year-round climate.

Daytime high
12°
11th warmest
Overnight low
3rd coldest
Precipitation
94 mm
10.6 wet days
Daylight
8 h 54 min
7:37 AM – 4:34 PM
Cloud cover
51%
8th clearest
Wind
9 km/h
2nd windiest
Solar energy
1.63 kWh/m²
Travel score
3.4
out of 10

Monterotondo is chief town of the homonym municipality.

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 14°C in the first days to 12°C by the end.

A typical December day in Monterotondo reaches about 12°C in the afternoon and slips back to 5°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 9°C and 15°C. Set against its neighbours, December runs about 4°C cooler than November and about 1°C warmer than January.

-5°10°15°20°151015202531
Avg high (°C)Avg low (°C)
1146
2146
3146
4136
5136
6136
7135
8135
9135
10135
11135
12135
13135
14125
15125
16125
17124
18124
19124
20124
21124
22124
23124
24124
25124
26124
27124
28124
29124
30124
31124

How December really feels in Monterotondo

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.

Monterotondo weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan12° / 638.69.33.2
Feb13° / 719.210.33.6
Mar16° / 749.111.75.1
Apr19° / 7710.613.16.0
May23° / 13°588.414.37.3
Jun28° / 17°345.5157.1
Jul31° / 19°23414.75.8
Aug31° / 20°224.313.75.5
Sep26° / 16°848.812.37.0
Oct22° / 13°11610.410.96.7
Nov16° / 12812.29.64.9
Dec12° / 9410.693.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 14% of December, with mostly cloudy or overcast conditions the remaining 46%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25347
35347
45347
55347
65347
75446
85446
95446
105545
115545
125446
135545
145545
155545
165545
175545
185446
195446
205446
215347
225446
235446
245446
255545
265545
275545
285545
295545
305545
315545

Chance of precipitation in December

Any precipitation

Monterotondo gets around 94 mm of rain and snow over 10.6 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 34% and peaks near 37% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%50%151015202531
Rain chance (%)
137
237
337
437
537
637
736
836
936
1035
1135
1235
1334
1434
1533
1633
1733
1833
1933
2033
2133
2233
2333
2433
2532
2632
2732
2832
2932
3031
3131

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
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
20991
21991
22991
23991
24991
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 9 km/h in December.

Across December, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm
319calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 12 min at the start of December to 9 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:24 AM to 7:43 AM, and sunset from 4:34 PM to 4:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.27:244:34
29.17:254:34
39.17:264:34
49.17:274:33
59.17:284:33
69.17:294:33
79.07:304:33
89.07:314:33
99.07:324:33
109.07:334:33
119.07:344:33
129.07:344:33
139.07:354:34
149.07:364:34
159.07:374:34
168.97:374:34
178.97:384:34
188.97:384:35
198.97:394:35
208.97:404:36
218.97:404:36
228.97:414:36
238.97:414:37
248.97:414:37
258.97:424:38
268.97:424:39
278.97:434:39
288.97:434:40
299.07:434:40
309.07:434:41
319.07:434:42

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.63 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.63 kWh/m² to a high of 7.08 kWh/m² in July across the year — December's 1.63 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.7Dim
21.7Dim
31.7Dim
41.7Dim
51.7Dim
61.7Dim
71.7Dim
81.7Dim
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
301.7Dim
311.7Dim
Planning a trip in December

Hazard calendar for Monterotondo

In seasonPeak

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

Monterotondo's rainy season runs September–April, when most of the year's rain falls.

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

Is December a good time to visit Monterotondo?

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

3.4
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 Monterotondo.

What to pack for Monterotondo in December

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

In December, Monterotondo sees daytime highs around 12°C and nights near 5°C. Worth packing: a warm layer and rain gear. About 11 days see rain.

a warm layerrain gear

Sea temperature near Monterotondo in December

The nearest coast averages about 16°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 45 km away) is warmest in August at about 25°C and coldest in February near 14°C.

It's comfortable for a long swim from Jun 1 to Oct 31 — about 5 months when the water holds above 20°C.

15°20°25°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan15Bracing
Feb14Bracing
Mar14Bracing
Apr15Cool
May18Cool
Jun22Refreshing
Jul25Warm
Aug25Warm
Sep24Refreshing
Oct21Refreshing
Nov19Cool
Dec16Cool

UV index in Monterotondo in December

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Monterotondo peaks around July 15 at about 10 (very high) — sunscreen, a hat and midday shade are essential. 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 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highHighModerateLowJul 15UV 10Dec 22UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar5High
Apr4Moderate
May7High
Jun9Very high
Jul10Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Monterotondo 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 Monterotondo is worst in April — around 17 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateGoodModerateModerateApr 1117 µg/m³Sep 1812 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar17Moderate
Apr17Moderate
May15Moderate
Jun14Moderate
Jul12Good
Aug13Moderate
Sep11Good
Oct12Moderate
Nov12Good
Dec13Moderate
Location & terrain

Where is Monterotondo?

Monterotondo sits at 42.1°N, 12.6°E, 165 m above sea level, in Italy. The nearest listed city is Mentana, 3.0 km away.

Topography around Monterotondo

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

Within 3 km, the terrain around Monterotondo has only modest variations in elevation — a maximum elevation change of 168 m around an average of 95 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,252 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,430 m.

The land around Monterotondo is covered by trees (38%), grassland (22%) and artificial surfaces (20%) within 3 km, trees (46%) and cropland (25%) within 16 km, and trees (51%) within 80 km.

3 km
168 m
16 km
1,252 m
80 km
2,430 m
treesshrubsgrasslandcroplandartificial surfaceswater
December weather nearby: Mentana 3.0 km · Tor Lupara 6.0 km · Guidonia 11 km · Guidonia Montecelio 11 km · Casal de' Pazzi 14 km · Villanova 15 km · Villa Adriana 17 km · Tivoli 18 km

Italy travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F / L
230 V · 50 Hz
Prices
≈ 69% of US
price level, 2025
GDP per capita
$43,309
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
97%
of population, 2024
Homicide rate
0.6
per 100k, 2023
Road deaths
5.3
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 513
Religion
Christian 81%unaffiliated 13%Muslim 5%other 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 Monterotondo (42.0516°, 12.6197°, elevation 165 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).