Climate Insights for Jaca

The climate in Jaca is cool. The average annual temperature is 8°C and approximately 1562mm of precipitation falls per year. Jaca receives a notable amount of rainfall throughout the year, including during its driest month. Jaca is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to -3°C. Jaca experiences heavy snowfall, typically from January through December.

Temperatures in Jaca vary considerably across the year, with a 26°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 23°C with a mean of 18°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is 0°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Jaca is a fairly wet location, receiving approximately 1562mm of precipitation annually, which averages out to around 130mm per month. The wettest month is June, averaging 157mm of rainfall. January and November also tend to see above-average precipitation. The driest month is July, with just 100mm. That's 57mm less than June, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Jaca receives heavy snowfall, accumulating around 349cm annually from January through December. The snowiest month is January, with approximately 75cm. Winter travel should account for significant snow cover.

Jaca is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently spring in Jaca, which began on March 20, 2026. Jaca is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 23°C, while the coldest stretch bottoms out in January near -3°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Jaca is during July, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 100mm per month. By contrast, January can be quite cold with temperatures dropping to -3°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Jaca based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.