Karaj Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Karaj, Iran. These values are calculated using 30 years of data (1990–2020) to ensure accuracy. Now, let's explore all the details to give you a full picture.
Karaj typically sees modest rain/snowfall throughout the year, with an average annual precipitation of 365 mm (14 in). The city experiences a distinct dry season during certain months, as illustrated in the graph below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Karaj can be quite wet during March, receiving approximately 59 mm (2.3 in) of precipitation over 12 rainy days.
In contrast August, experiences much drier conditions, with 4 mm (0.2 in) of rainfall, spread across 2 rainy days.
March, the wettest month, has a maximum daytime temperature of 11°C (52°F). The city receives 198 hours of sunshine in this period. During the driest month August you can expect a temperature of 33°C (91°F). For more detailed insights into the city's temperatures, visit our Karaj Temperature page.
Daily Historical Precipitation
42-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Karaj's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Karaj spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Iran: City Comparison
The map below shows the annual precipitation across Iran. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Karaj vs World: Rainfall Compared
Karaj's average annual precipitation is 365 mm (14 in). Let's compare this to some popular worldwide tourist destinations:
In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.
Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.
Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.
Kuala Lumpur, Malaysia, receives 2529 mm (100 in) of annual rainfall, characteristic of its equatorial tropical rainforest climate, with consistent rainfall throughout the year and peak months during March and November.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
Tropical Rainforests: In tropical regions, rainfall is generally abundant year-round. Areas near the equator, like the Amazon rainforest, can receive up to 3000 mm (118 in) of rain annually.
Desert Regions: Deserts such as the Sahara and Arabian deserts typically see less than 250 mm (9.8 in) of rainfall annually. Rainfall tends to be infrequent, but when it does occur, it is often intense.
Temperate Zones: In temperate regions, precipitation tends to be more evenly distributed, though areas closer to the ocean may see more rain in the winter months, and areas further inland experience drier summers.
Polar Regions: Precipitation in polar regions, like Antarctica, is extremely low, often falling as snow. Average annual precipitation in Antarctica is less than 200 mm (7.9 in), with some areas receiving as little as 50 mm (2 in) annually.
- "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
- The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
- The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters (103 feet) fell during the winter of 1972.
For more detailed information about Karaj's weather, including sunshine hours, humidity levels, and temperature data, visit our Karaj Climate page.
