Climate Insights for Jaca

The climate in Jaca is temperate. The average annual temperature is 11°C and approximately 1083mm 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: August, July, June. The coldest months are January, February, December, when temperatures can drop to 0°C. Snowfall occurs from January to December, with around 157cm accumulating over the season.

Temperatures in Jaca vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 21°C. January is the coolest month, with minimum temperatures around 0°C and an average of 4°C. On average, daily temperatures fluctuate by about 10°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 moderately rainy area, receiving approximately 1083mm of precipitation annually, which averages out to around 90mm per month. The wettest month is November, averaging 121mm of rainfall. March and January also tend to see above-average precipitation. The driest month is July, with just 45mm. That's 75mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 157cm accumulating over the season. January typically sees the most snow at around 41cm.

Jaca is relatively calm, with an average annual wind speed of 2km/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 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 2km/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 August at around 28°C, while the coldest stretch bottoms out in January near 0°C. Summer is next, beginning on June 21, 2026 — 3 days from now.

The best time to visit Jaca is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 56mm per month. By contrast, January can be quite cold with temperatures dropping to 0°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

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.