St Mary Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in St Mary, Jamaica. 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.
St Mary has a notably wet climate with abundant precipitation, recording 1050 mm (41 in) of rainfall per year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The climate in St Mary shows significant variation throughout the year. Expect 143 mm (5.6 in) of precipitation during the wettest month October, distributed over 16 rainy days.
In contrast, February offers drier and sunnier days, with around 55 mm (2.2 in) of rainfall over 6 rainy days.
October, the wettest month, has a maximum daytime temperature of 30°C (86°F). The city receives 226 hours of sunshine in this period. During the driest month February you can expect a temperature of 28°C (82°F). For more detailed insights into the city's temperatures, visit our St Mary Temperature page.
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in July
Explore St Mary's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for St Mary spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Jamaica: City Comparison
The map below shows the annual precipitation across Jamaica. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
St Mary vs World: Rainfall Compared
St Mary's average annual precipitation is 1050 mm (41 in). Let's compare this to some popular worldwide tourist destinations:
The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.
In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.
Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.
Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.
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.
- The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
- Approximately 70% of lightning bolts strike land rather than oceans.
- A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.
For more detailed information about St Mary's weather, including sunshine hours, humidity levels, and temperature data, visit our St Mary Climate page.
