Climate and Average Weather Year Round in Montserrat Montserrat

The climate in Montserrat is warm, oppressive, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 73°F to 87°F and is rarely below 71°F or above 89°F.

Based on the beach/pool score, the best time of year to visit Montserrat for hot-weather activities is from early December to mid April.

The temperature in Montserrat varies so little throughout the year that it is not entirely meaningful to discuss hot and cold seasons.

In Montserrat, 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 Montserrat begins around November 22 and lasts for 5.0 months, ending around April 23.

The clearest month of the year in Montserrat is January, during which on average the sky is clear, mostly clear, or partly cloudy 76% of the time.

The cloudier part of the year begins around April 23 and lasts for 7.0 months, ending around November 22.

The cloudiest month of the year in Montserrat is September, during which on average the sky is overcast or mostly cloudy 64% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Montserrat varies throughout the year.

The wetter season lasts 7.0 months, from May 6 to December 7, with a greater than 22% chance of a given day being a wet day. The month with the most wet days in Montserrat is September, with an average of 10.5 days with at least 0.04 inches of precipitation.

The drier season lasts 5.0 months, from December 7 to May 6. The month with the fewest wet days in Montserrat is February, with an average of 2.6 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Montserrat is September, with an average of 10.5 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 37% on September 24.

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. Montserrat experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Montserrat. The month with the most rain in Montserrat is October, with an average rainfall of 4.0 inches.

The month with the least rain in Montserrat is March, with an average rainfall of 0.6 inches.

The length of the day in Montserrat varies over the course of the year. In 2024, the shortest day is December 21, with 11 hours, 8 minutes of daylight; the longest day is June 20, with 13 hours, 8 minutes of daylight.

The earliest sunrise is at 5:34 AM on June 3, and the latest sunrise is 1 hour, 7 minutes later at 6:41 AM on January 20. The earliest sunset is at 5:33 PM on November 22, and the latest sunset is 1 hour, 13 minutes later at 6:46 PM on July 6.

Daylight saving time (DST) is not observed in Montserrat during 2024.

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.

The perceived humidity level in Montserrat, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 4% of 96% throughout.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters 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 Montserrat experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 3.0 months, from May 23 to August 21, with average wind speeds of more than 14.5 miles per hour. The windiest month of the year in Montserrat is July, with an average hourly wind speed of 16.6 miles per hour.

The calmer time of year lasts for 9.0 months, from August 21 to May 23. The calmest month of the year in Montserrat is October, with an average hourly wind speed of 12.5 miles per hour.

The predominant average hourly wind direction in Montserrat is from the east throughout the year.

Montserrat is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from August 5 to November 13, with an average temperature above 83°F. The month of the year in Montserrat with the warmest water is September, with an average temperature of 84°F.

The time of year with cooler water lasts for 3.0 months, from January 11 to April 9, with an average temperature below 80°F. The month of the year in Montserrat with the coolest water is February, with an average temperature of 79°F.

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

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Montserrat for general outdoor tourist activities is from late December to late March, with a peak score in the first week of February.

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Montserrat for hot-weather activities is from early December to mid April, with a peak score in the third week of January.

Methodology

For each hour between 8:00 AM and 9:00 PM 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 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F 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 (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Montserrat are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

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 50°F and a cap of 86°F.

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 some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.0 months, from March 5 to May 7, with an average daily incident shortwave energy per square meter above 6.7 kWh. The brightest month of the year in Montserrat is April, with an average of 7.1 kWh.

The darker period of the year lasts for 3.6 months, from September 16 to January 3, with an average daily incident shortwave energy per square meter below 5.2 kWh. The darkest month of the year in Montserrat is October, with an average of 4.8 kWh.

For the purposes of this report, the geographical coordinates of Montserrat are 16.750 deg latitude, -62.200 deg longitude, and 0 ft elevation.

The topography within 2 miles of Montserrat is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Montserrat is covered by trees (59%) and cropland (27%), within 10 miles by water (90%), and within 50 miles by water (97%).