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Park climate1991–2020 climate normals33 m source elevationNASA POWER

Atmospheric data for a representative coordinate, tracking twelve-month patterns.

Dassen Island Monthly Climate Normals: Long-term Temperature and Precipitation Profiles

The climate profile for Dassen Island presents long-term averages for temperature, precipitation, humidity, wind, and daylight hours, derived from NASA POWER measurements for the 1991 to 2020 period. These values characterize the atmospheric environment at a specific coordinate within the nature reserve. Monthly data series offer a structured view of historical weather patterns, distinct from active meteorological forecasts or whole-park climate variations.

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A stylized vector illustration depicting a wide mountain valley with a winding river, dense forest, and a waterfall cascading down a rocky cliff under a soft sunrise sky.
Annual climate pattern

Long-term thermal range and average daily precipitation cycles across the twelve-month climatology

Dassen Island Annual Climate Normals: Monthly Average Temperature and Precipitation Patterns

Average monthly temperatures span from warm summer peaks to cooler winter lows across the twelve recorded intervals for Dassen Island. Average daily precipitation rates accompany these thermal movements within a single representative coordinate dataset spanning from 1991 to 2020.
Mean temperatureAverage minimum–maximum rangePrecipitation
Temperature (°C)PrecipitationUp to 2.7 mm/day5°10°15°20°25°30°20°20°19°17°16°14°14°14°15°16°18°19°01230.40.30.51.11.52.72.321.20.90.90.4JanFebMarAprMayJunJulAugSepOctNovDec
Annual mean
16.9 °C
Warmest month
February
Coolest month
July
Wettest month
June
Twelve-month climate

Analyze long-term temperature bounds, precipitation rates, humidity, and daylight hours across the calendar year.

Dassen Island Weather by Month: Complete Twelve-Month Climate Comparison

Examine average monthly temperature ranges and daily precipitation rates alongside wind speeds and relative humidity at a representative coordinate for Dassen Island. Compare all twelve recorded periods to evaluate long-term climate normals without relying on aggregated annual summaries.
Mean temperaturePrecipitationHumidityWind speedDaylight
January20.1 °C15.7° to 27.1°0.4 mm/day74.8%6.8 m/s13.9 hours
February20.4 °C16.2° to 27.5°0.3 mm/day75.2%6.3 m/s13.2 hours
March19.3 °C14.8° to 26.6°0.5 mm/day76.4%5.8 m/s12.2 hours
April17.5 °C12.8° to 25.7°1.1 mm/day76.8%5.1 m/s11.2 hours
May16 °C11.7° to 23.4°1.5 mm/day79.4%4.8 m/s10.3 hours
June14.5 °C10.1° to 20.6°2.7 mm/day78.2%5.3 m/s9.8 hours
July13.8 °C9.1° to 19.7°2.3 mm/day79%5.3 m/s10 hours
August13.8 °C9.5° to 20.3°2 mm/day79.7%5.4 m/s10.8 hours
September14.7 °C10.4° to 22.4°1.2 mm/day79%5.5 m/s11.8 hours
October16.2 °C11.4° to 24.4°0.9 mm/day77%6 m/s12.9 hours
November17.5 °C13.1° to 25.1°0.9 mm/day75.1%6.4 m/s13.8 hours
December19.2 °C14.8° to 26°0.4 mm/day74.8%6.4 m/s14.2 hours

Compare two months

See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.

Mean temperature
July: 13.8 °C
February: 20.4 °C
Change from July to February: +6.6 °C
Precipitation
July: 2.3 mm/day
February: 0.3 mm/day
Change from July to February: -2 mm/day
Daylight
July: 10 hours
February: 13.2 hours
Change from July to February: +3.2 hours
Calculated climate highlights

Comparing long-term averages for temperature, precipitation, wind, and daylight duration

Calculated Monthly Climate Highlights and Seasonal Contrasts for Dassen Island

These calculated monthly comparisons identify the warmest, coolest, wettest, and windiest periods derived from long-term climate normals at a representative coordinate. Reviewing multiple variables highlights annual patterns without equating monthly averages to observed weather extremes or localized conditions.
Warmest month
February20.4 °C
Coolest month
July13.8 °C
Wettest month
June2.7 mm/day
Driest month
February0.3 mm/day
Most humid month
August79.7%
Windiest month
January6.8 m/s
Longest daylight
December14.2 hours

Interactive climate map

National park climate map

Open the climate map to compare monthly temperature, precipitation, and other averages.

Global National Park Climate Map
Other park climates

Explore long-term monthly climate norms across diverse protected landscapes and settings.

Comparing Dassen Island Climate Profiles With Other Protected Natural Areas

Standardized monthly climate records enable direct comparison of temperature, precipitation, and wind patterns across different protected landscapes. Evaluating multiple park profiles reveals distinct atmospheric rhythms and geographic variations without assuming equivalent environmental conditions.
MoriAtlas Explorer

Explore the Geographic Boundaries and Protected Landscape of Dassen Island

Examine the detailed geographic profile of Dassen Island through the MoriAtlas platform. Analyze the nature reserve boundaries, the unique Atlantic reef system, and the island's role within the broader coastal ecology of the Western Cape. Connect with the spatial history and conservation data of this vital South African maritime landmark.

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Dassen Island Protected Area Geography

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