Jamaica Climate, Weather By Month, Average Temperature (United States) (2024)

In Jamaica, the summers are comfortable and wet, the winters are freezing and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from -11°C to 25°C and is rarely below -21°C or above 29°C.

Based on the tourism score, the best time of year to visit Jamaica for warm-weather activities is from late June to early September.

The warm season lasts for 3.7 months, from 25 May to 16 September, with an average daily high temperature above 20°C. The hottest month of the year in Jamaica is July, with an average high of 25°C and low of 14°C.

The cold season lasts for 3.3 months, from 1 December to 11 March, with an average daily high temperature below 3°C. The coldest month of the year in Jamaica is January, with an average low of -11°C and high of -2°C.

In Jamaica, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Jamaica begins around 22 June and lasts for 4.0 months, ending around 24 October.

The clearest month of the year in Jamaica is August, during which on average the sky is clear, mostly clear, or partly cloudy 62% of the time.

The cloudier part of the year begins around 24 October and lasts for 8.0 months, ending around 22 June.

The cloudiest month of the year in Jamaica is January, during which on average the sky is overcast or mostly cloudy 57% of the time.

A wet day is one with at least 1 millimetre of liquid or liquid-equivalent precipitation. The chance of wet days in Jamaica varies throughout the year.

The wetter season lasts 5.8 months, from 12 April to 4 October, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in Jamaica is July, with an average of 11.6 days with at least 1 millimetre of precipitation.

The drier season lasts 6.2 months, from 4 October to 12 April. The month with the fewest wet days in Jamaica is February, with an average of 6.5 days with at least 1 millimetre of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Jamaica changes throughout the year.

Rain alone is the most common for 9.1 months, from 9 March to 12 December. The month with the most days of rain alone in Jamaica is July, with an average of 11.6 days.

Snow alone is the most common for 2.9 months, from 12 December to 9 March. The month with the most days of snow alone in Jamaica is January, with an average of 3.9 days.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Jamaica experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Jamaica. The month with the most rain in Jamaica is June, with an average rainfall of 91 millimetres.

The month with the least rain in Jamaica is January, with an average rainfall of 26 millimetres.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Jamaica experiences extreme seasonal variation in monthly snowfall.

The snowy period of the year lasts for 6.1 months, from 23 October to 27 April, with a sliding 31-day snowfall of at least 25 millimetres. The month with the most snow in Jamaica is February, with an average snowfall of 382 millimetres.

The snowless period of the year lasts for 5.9 months, from 27 April to 23 October. The least snow falls around 26 July, with an average total accumulation of 0 millimetres.

The length of the day in Jamaica varies significantly over the course of the year. In 2024, the shortest day is 21 December, with 9 hours, 0 minutes of daylight; the longest day is 20 June, with 15 hours, 23 minutes of daylight.

The earliest sunrise is at 05:11 on 14 June, and the latest sunrise is 2 hours, 17 minutes later at 07:27 on 2 November. The earliest sunset is at 16:15 on 9 December, and the latest sunset is 4 hours, 19 minutes later at 20:34 on 26 June.

Daylight saving time (DST) is observed in Jamaica during 2024, starting in the spring on 10 March, lasting 7.8 months, and ending in the fall on 3 November.

The figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Jamaica experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.0 months, from 11 June to 13 September, during which time the comfort level is muggy, oppressive, or miserable at least 5% of the time. The month with the most muggy days in Jamaica is July, with 5.5 days that are muggy or worse.

The least muggy day of the year is 1 March, when muggy conditions are essentially unheard of.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 metres above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Jamaica experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.3 months, from 15 November to 26 April, with average wind speeds of more than 8.2 kilometres per hour. The windiest month of the year in Jamaica is February, with an average hourly wind speed of 10.7 kilometres per hour.

The calmer time of year lasts for 6.7 months, from 26 April to 15 November. The calmest month of the year in Jamaica is August, with an average hourly wind speed of 5.7 kilometres per hour.

The predominant average hourly wind direction in Jamaica is from the west throughout the year.

To characterize how pleasant the weather is in Jamaica throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 18°C and 27°C. Based on this score, the best time of year to visit Jamaica for general outdoor tourist activities is from late June to early September, with a peak score in the last week of July.

The beach/pool score favors clear, rainless days with perceived temperatures between 24°C and 32°C. Based on this score, the best time of year to visit Jamaica for hot-weather activities is from early July to early August, with a peak score in the third week of July.

Methodology

For each hour between 08:00 and 21:00 of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 1 millimetre of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 10°C, rising linearly to 9 for 18°C, to 10 for 24°C, falling linearly to 9 for 27°C, and to 1 for 32°C or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 18°C, rising linearly to 9 for 24°C, to 10 for 28°C, falling linearly to 9 for 32°C, and to 1 for 38°C or hotter.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 0°C) in the year (the calendar year in the Northern Hemisphere, or from 1 July until 30 June in the Southern Hemisphere).

The growing season in Jamaica typically lasts for 4.7 months (143 days), from around 11 May to around 1 October, rarely starting before 25 April or after 28 May, and rarely ending before 15 September or after 18 October.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 10°C and a cap of 30°C.

Based on growing degree days alone, the first spring blooms in Jamaica should appear around 3 May, only rarely appearing before 21 April or after 13 May.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.5 months, from 4 May to 21 August, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest month of the year in Jamaica is July, with an average of 6.6 kWh.

The darker period of the year lasts for 3.4 months, from 31 October to 11 February, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest month of the year in Jamaica is December, with an average of 1.5 kWh.

For the purposes of this report, the geographical coordinates of Jamaica are 43.100 deg latitude, -72.778 deg longitude, and 219 m elevation.

The topography within 3 kilometres of Jamaica contains very significant variations in elevation, with a maximum elevation change of 402 metres and an average elevation above sea level of 348 metres. Within 16 kilometres contains very significant variations in elevation (1,081 metres). Within 80 kilometres also contains extreme variations in elevation (1,275 metres).

The area within 3 kilometres of Jamaica is covered by trees (98%), within 16 kilometres by trees (97%), and within 80 kilometres by trees (88%).

This report illustrates the typical weather in Jamaica, based on a statistical analysis of historical hourly weather reports and model reconstructions from 1 January 1980 to 31 December 2016.

Temperature and Dew Point

There are 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Jamaica.

For each station, the records are corrected for the elevation difference between that station and Jamaica according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Jamaica is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Jamaica and a given station.

The stations contributing to this reconstruction are:

• Hartness State Airport (Springfield) (KVSF, 31%, 34 km, northeast, -43 m elevation change)
• William H. Morse State Airport (KDDH, 21%, 45 km, southwest, 32 m elevation change)
• Dillant-Hopkins Airport (KEEN, 19%, 47 km, southeast, -73 m elevation change)
• Rutland - Southern Vermont Regional Airport (KRUT, 18%, 50 km, north, 20 m elevation change)
• Floyd Bennett Memorial Airport (KGFL, 10%, 73 km, northwest, -118 m elevation change)

To get a sense of how much these sources agree with each other, you can view a comparison of Jamaica and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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