Cergy-Pontoise climate
Cergy-Pontoise (Île-de-France, France) has a temperate oceanic climate (Köppen Cfb). The average temperature over the year is 11 °C52 °F, and about 672 mm26 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Cergy-Pontoise climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 644 | 133 | 438 | 562.2 | 14 |
| Feb | 846 | 033 | 439 | 502.0 | 13 |
| Mar | 1253 | 236 | 745 | 542.1 | 8 |
| Apr | 1661 | 541 | 1051 | 411.6 | 2 |
| May | 1966 | 847 | 1457 | 642.5 | 0 |
| Jun | 2373 | 1253 | 1763 | 582.3 | 0 |
| Jul | 2577 | 1457 | 1967 | 552.1 | 0 |
| Aug | 2476 | 1356 | 1966 | 582.3 | 0 |
| Sep | 2170 | 1051 | 1660 | 421.6 | 0 |
| Oct | 1661 | 745 | 1253 | 612.4 | 1 |
| Nov | 1151 | 439 | 745 | 642.5 | 4 |
| Dec | 744 | 134 | 439 | 712.8 | 14 |
| Year | 2577 | 033 | 1152 | 67226 | 54 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 93% | 76% | 0.9 | 8:39 |
| Feb | 88% | 72% | 1.6 | 10:05 |
| Mar | 83% | 66% | 2.9 | 11:44 |
| Apr | 78% | 62% | 4.5 | 13:39 |
| May | 78% | 68% | 5.2 | 15:16 |
| Jun | 76% | 67% | 5.6 | 16:11 |
| Jul | 73% | 65% | 5.4 | 15:48 |
| Aug | 74% | 64% | 4.6 | 14:22 |
| Sep | 77% | 60% | 3.6 | 12:31 |
| Oct | 85% | 68% | 2.1 | 10:41 |
| Nov | 91% | 75% | 1.1 | 9:03 |
| Dec | 93% | 76% | 0.7 | 8:14 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Cergy-Pontoise is like
The warmest month is July, with an average high of 25 °C77 °F and a low of 14 °C57 °F. The coldest is January, when highs average 6 °C44 °F and lows 1 °C33 °F. There is a clear seasonal cycle, with 15.7 °C28.3 °F between the average temperature of the warmest and the coolest month.
Annual precipitation is moderate at about 672 mm26 in. Rain is spread fairly evenly through the year. The wettest month is December (71 mm2.8 in), the driest is April (41 mm1.6 in).
Relative humidity ranges from 73% in July to 93% in December. The clearest skies (lowest average cloud amount, 60%) are typical of September. Average wind speed near the ground ranges from 9 km/h (6 mph) in August to 13 km/h (8 mph) in February. Daylight lasts from about 8.2 hours in December to 16.2 hours in June.
Best time to visit Cergy-Pontoise
Based on these averages, the most comfortable months for sightseeing and outdoor activities are May–September: average highs of 19 °C66 °F to 25 °C77 °F with 42 mm1.6 in to 64 mm2.5 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 6 °C44 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Cergy-Pontoise
- Winter (December–February) — highs 644 to 8 °C46 °F, lows 033 to 1 °C34 °F, about 59 mm2.3 in of precipitation a month. Pack a warm coat, layers and closed shoes.
- Spring (March–May) — highs 1253 to 19 °C66 °F, lows 236 to 8 °C47 °F, about 53 mm2.1 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 2373 to 25 °C77 °F, lows 1253 to 14 °C57 °F, about 57 mm2.2 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an extra layer for the cooler mornings and evenings.
- Autumn (September–November) — highs 1151 to 21 °C70 °F, lows 439 to 10 °C51 °F, about 55 mm2.2 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
How Cergy-Pontoise compares
Compared with Paris, about 29 km to the southeast, Cergy-Pontoise has practically the same average temperature and receives a similar amount of precipitation.
Of the 36 places in France covered by World Climates, Cergy-Pontoise is the 23rd warmest by annual mean temperature and the 29th wettest by annual precipitation. See all of them on the France climate page.
Places in other countries with the most similar temperature and rainfall pattern: Antwerp (Belgium, Cfb), Leuven (Belgium, Cfb) and Brussels (Belgium, Cfb).
Nearby places
- Paris 29 km · 11 °C52 °F · 662 mm26 in
- Saint-Quentin-en-Yvelines 30 km · 10 °C51 °F · 672 mm26 in
- Rouen 84 km · 11 °C52 °F · 750 mm30 in
- Amiens 97 km · 11 °C51 °F · 749 mm29 in
- Orléans 127 km · 11 °C52 °F · 665 mm26 in
- Reims 144 km · 11 °C51 °F · 740 mm29 in
- Le Havre 152 km · 12 °C53 °F · 803 mm32 in
- Caen 178 km · 12 °C53 °F · 745 mm29 in
Frequently asked questions
What is the warmest month in Cergy-Pontoise?
July is the warmest month in Cergy-Pontoise, with an average high of 25 °C (77 °F) and an average low of 14 °C (57 °F).
What is the coldest month in Cergy-Pontoise?
January is the coldest month, with an average high of 6 °C (44 °F) and an average low of 1 °C (33 °F).
When does it rain the most in Cergy-Pontoise?
December is the wettest month with about 71 mm (2.8 in) of precipitation; April is the driest with about 41 mm (1.6 in).
What is the best time to visit Cergy-Pontoise?
Judging by long-term averages, the most comfortable months are May–September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.
The grid cell’s average elevation is 116 m, while Cergy-Pontoise lies at about 54 m. Temperatures on this page were therefore adjusted by +0.4 °C0.7 °F using the standard lapse rate of 6.5 °C per 1,000 m.