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Contents
- The climate of Longwood
- The best time to visit Longwood
- The worst time to visit Longwood
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
The climate of Longwood
Categorized under the Köppen climate classification, Longwood, a district of Saint Helena, Ascension and Tristan da Cunha, is characterized by a warm, temperate, marine climate with significant rainfall throughout the year. This island outcrop in the South Atlantic lacks the extremes of temperature typically found in mainland climates due to its geographical position and exposure to maritime airflows.
Across the months, Longwood experiences a nearly constant temperature range with highs averaging from 19.7°C (67.5°F) to 24.7°C (76.5°F) and lows spanning from 18.7°C (65.7°F) to 23.5°C (74.3°F). These contribute to a comfortable year-round climate, underscored by its moderate humidity levels, typically maintaining from 74% to 82%. Thus, seldom are residents or visitors subjected to oppressive or stifling weather conditions.
Despite its temperate nature, Longwood's rainfall pattern is quite noteworthy. Rainfall quantities remain relatively stable, varying from 6mm (0.24") to 11mm (0.43") per month, with the frequency of rainy days ranging from 8.5 to 13.6 days. Interestingly, it is not the months with the highest rainfall that experience the most rainy days.
In relation to sunlight exposure and daylight duration, Longwood encounters subtle seasonal flux. Daylight hours change gradually from 11.2hrs to 13.1hrs, and the hours of actual sunshine per day fluctuate between 4hrs to 7.5hrs, directly affecting the UV index that hovers between 4 and 6. Additionally, cloud cover% varies appropriately, reaching its maximum at 74% and its minimum at 44%.
Wind patterns in Longwood vary distinctly across months. Average wind speeds fluctuate between 21.8km/h (13.5mph) and 28.4km/h (17.6mph), with maximum speeds reaching up to 28.7km/h (17.8mph). This exemplifies the island's maritime climate, with gusts being more pronounced, escalating up to 39.9km/h (24.8mph).
Across the months, Longwood experiences a nearly constant temperature range with highs averaging from 19.7°C (67.5°F) to 24.7°C (76.5°F) and lows spanning from 18.7°C (65.7°F) to 23.5°C (74.3°F). These contribute to a comfortable year-round climate, underscored by its moderate humidity levels, typically maintaining from 74% to 82%. Thus, seldom are residents or visitors subjected to oppressive or stifling weather conditions.
Despite its temperate nature, Longwood's rainfall pattern is quite noteworthy. Rainfall quantities remain relatively stable, varying from 6mm (0.24") to 11mm (0.43") per month, with the frequency of rainy days ranging from 8.5 to 13.6 days. Interestingly, it is not the months with the highest rainfall that experience the most rainy days.
In relation to sunlight exposure and daylight duration, Longwood encounters subtle seasonal flux. Daylight hours change gradually from 11.2hrs to 13.1hrs, and the hours of actual sunshine per day fluctuate between 4hrs to 7.5hrs, directly affecting the UV index that hovers between 4 and 6. Additionally, cloud cover% varies appropriately, reaching its maximum at 74% and its minimum at 44%.
Wind patterns in Longwood vary distinctly across months. Average wind speeds fluctuate between 21.8km/h (13.5mph) and 28.4km/h (17.6mph), with maximum speeds reaching up to 28.7km/h (17.8mph). This exemplifies the island's maritime climate, with gusts being more pronounced, escalating up to 39.9km/h (24.8mph).
The best time to visit Longwood
Taking into consideration temperature stability, humidity comfort, and the challenge of rain, the perfect time to explore Longwood would be in March. It is a month when the average high is an inviting 24.7°C (76.5°F), with relative humidity at a bearable 78%. Additionally, despite an 8mm (0.31") rainfall, the number of rainy days is reasonably less (12.5 days) compared to other months, allowing for more dry, pleasant days.
The worst time to visit Longwood
Conversely, the least favorable time to visit Longwood might be September. Although its temperature range remains within agreeable limits to 24.3°C (75.7°F).
Weather in February
Meteorologically, Longwood's February weather carries on from the trends established in January, with minor deviations. The rainfall hovers around January's value but takes a slight dip in the incoming month. It is catalyzed by the temperature rise at 24.3°C (75.7°F), only to marginally decrease to 24.2°C (75.6°F) in April. Weather in February »
Weather in March
As Longwood moves into March, slightly hotter temperatures become the norm while maintaining high wind speeds as witnessed in February. Most notably, the zenith temperature increases to 24.7°C (76.5°F) making it the hottest month of the year. Weather in March »
Weather in April
Lingering into April, Longwood's weather fluctuates, manifesting shorter daylight hours but more sunshine compared to March. The meteorological data exhibits cooler conditions with the maximum temperature declining to 24.2°C (75.6°F) before experiencing a more significant drop in May. Weather in April »
Weather in May
Shifting into May, Longwood experiences a unique blend of weather conditions, reflecting the change in seasons. Records indicate a decrease in temperatures, with the upper limit being 23.2°C (73.8°F), signifying the start of a cooling trend stretching till September. Weather in May »
Weather in June
Entering mid-year, Longwood sees the onset of winters, with a temperature drop touching 22°C (71.6°F). Despite this, the region reports a spike in rainfall to 11mm (0.43"), a characteristic that propagates into August. It is observed that this month experiences the least amount of sunshine hours, an average of 5, as it's counteracted by high humidity levels. Weather in June »
Weather in July
In contrast to June's wet weather, Longwood's July sees a small decrease in rainfall, although the temperature continues its downward stride. The mercury level sinks further down to 20.9°C (69.6°F), marking the middle of the region's winter season. Weather in July »
Weather in August
Longwood's August is distinguished by its stable weather, marked by steady winds and consistent cloud cover, a feature that extends into September. The climatic data reveals the recorded temperature to be at its lowest for the year at 20.1°C (68.2°F). Weather in August »
Weather in September
Entering September, Longwood undergoes a transition from cold winters to pleasant springs, with temperatures gradually rising and wind speeds attaining their peak. Most notable in this month is the wind's gust speed, reaching its yearly maximum of 39.9km/h (24.8mph). Weather in September »
Weather in October
As we delve into October, Longwood is met with an increase in daily sunshine hours, along with a decrease in average wind speed. October sees a slight drop in the gust speed of wind to 38.5km/h (23.9mph), commencing its downward trend which continues up to January. Weather in October »
Weather in November
Stepping into November, Longwood experiences the onset of a warmer climate, initiated by a steady rise in temperature reaching 20.3°C (68.5°F). This is coupled with the least number of rainfall days, adding up to 8.5. As we move through the month, the residents of the area embrace the pleasant transition towards a warmer climate. Weather in November »
Weather in December
As Longwood ushers in December, it is greeted with warming temperatures and prominent sunlight, setting the stage for welcoming the new year. The temperature hikes up to 21.5°C (70.7°F), setting it apart from the previous months. Weather in December »
[Resources]Frequently asked questions
How much does it rain in Longwood?
Throughout the year, in Longwood, Saint Helena, Ascension and Tristan da Cunha, there are 133.1 rainfall days, and 92mm (3.62") of precipitation is accumulated.
What is the month with the highest UV index in Longwood?
January through March and May, with an average maximum UV index of 6, are months with the highest UV index in Longwood, Saint Helena, Ascension and Tristan da Cunha.
What month has the most sunshine in Longwood?
The month with the most sunshine in Longwood, Saint Helena, Ascension and Tristan da Cunha, is February, with an average of 7.5h of sunshine.
What time of the year is the hottest in Longwood?
March, noted for its average high-temperature of 24.7°C (76.5°F) and an average low-temperature of 23.5°C (74.3°F), is considered the warmest month in Longwood, Saint Helena, Ascension and Tristan da Cunha.
What is the driest month in Longwood?
May, September through November are months with the least rain when the rain falls for 10.5 days and typically aggregates up to 6mm (0.24") of rain.
What are the least humid months in Longwood?
June and July, with an average relative humidity of 74%, are the least humid months.
What is the wettest month in Longwood?
June is the month with the most rainfall. Rain falls for 13.6 days and accumulates 11mm (0.43") of precipitation.
What is the month with the shortest days in Longwood?
June has the shortest days of the year in Longwood, Saint Helena, Ascension and Tristan da Cunha, with an average of 11h and 12min of daylight.
When is the lowest UV index in Longwood?
August through October, with an average maximum UV index of 4, are months with the lowest UV index.
What time of the year is the coldest in Longwood?
In Longwood, September is known for its average lowest temperatures, reaching a high of 19.7°C (67.5°F) and a low of 18.7°C (65.7°F).
What is the month with the least sunshine in Longwood?
With an average of 4h of sunshine, September has the least sunshine of the year in Longwood, Saint Helena, Ascension and Tristan da Cunha.
What is the most humid month in Longwood?
With an average relative humidity of 82%, October is the most humid month.
When are the longest days in Longwood?
With an average of 13h and 6min of daylight, December has the longest days of the year.
Is there Daylight Saving Time (DST) in Longwood?
Longwood, Saint Helena, Ascension and Tristan da Cunha, does not observe Daylight Saving Time (DST). GMT timezone is used throughout the entire year.
Average temperature
Longwood, Saint Helena, Ascension and Tristan da Cunha
The warmest month (with the highest average high temperature) is March (24.7°C).
The month with the lowest average high temperature is September (19.7°C).
The month with the highest average low temperature is March (23.5°C).
The coldest months (with the lowest average low temperature) are September and October (18.7°C).
Average pressure
Longwood, Saint Helena, Ascension and Tristan da Cunha
- Average pressure in January:
1015.1mbar - Average pressure in February:
1014.1mbar - Average pressure in March:
1014.3mbar - Average pressure in April:
1015.1mbar - Average pressure in May:
1016.6mbar - Average pressure in June:
1019mbar
- Average pressure in July:
1019.8mbar - Average pressure in August:
1019.8mbar - Average pressure in September:
1019mbar - Average pressure in October:
1017.4mbar - Average pressure in November:
1016.3mbar - Average pressure in December:
1015.7mbar
The months with the highest atmospheric pressure are July and August (1019.8mbar).
The month with the lowest atmospheric pressure is February (1014.1mbar).
Average wind speed
Longwood, Saint Helena, Ascension and Tristan da Cunha
- Average wind speed in January:
21.8km/h - Average wind speed in February:
22.5km/h - Average wind speed in March:
23.2km/h - Average wind speed in April:
24.7km/h - Average wind speed in May:
23.8km/h - Average wind speed in June:
26.2km/h
- Average wind speed in July:
26.2km/h - Average wind speed in August:
27.7km/h - Average wind speed in September:
28.4km/h - Average wind speed in October:
27.2km/h - Average wind speed in November:
25.3km/h - Average wind speed in December:
23.2km/h
The windiest month (with the highest average wind speed) is September (28.4km/h).
The calmest month (with the lowest average wind speed) is January (21.8km/h).
Average humidity
Longwood, Saint Helena, Ascension and Tristan da Cunha
The month with the highest relative humidity is October (82%).
The months with the lowest relative humidity are June and July (74%).
Average rainfall
Longwood, Saint Helena, Ascension and Tristan da Cunha
The wettest month (with the highest rainfall) is June (11mm).
The driest months (with the least rainfall) are May, September, October and November (6mm).
Average rainfall days
Longwood, Saint Helena, Ascension and Tristan da Cunha
- Average rainfall days in January:
9.8 days - Average rainfall days in February:
9.9 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
11.8 days - Average rainfall days in May:
10.5 days - Average rainfall days in June:
13.6 days
- Average rainfall days in July:
13.1 days - Average rainfall days in August:
13.4 days - Average rainfall days in September:
9.6 days - Average rainfall days in October:
9.2 days - Average rainfall days in November:
8.5 days - Average rainfall days in December:
11.2 days
The month with the highest number of rainy days is June (13.6 days).
The month with the least rainy days is November (8.5 days).
Average daylight / Average sunshine
Longwood, Saint Helena, Ascension and Tristan da Cunha
- Average daylight in January:
13h and 0min - Average daylight in February:
12h and 4min - Average daylight in March:
12h and 1min - Average daylight in April:
11h and 4min - Average daylight in May:
11h and 2min - Average daylight in June:
11h and 1min
- Average daylight in July:
11h and 2min - Average daylight in August:
11h and 4min - Average daylight in September:
12h and 0min - Average daylight in October:
12h and 3min - Average daylight in November:
12h and 5min - Average daylight in December:
13h and 1min
The month with the longest days is December (Average daylight: 13h and 6min).
The month with the shortest days is June (Average daylight: 11h and 12min).
- Average sunshine in January:
7h and 2min - Average sunshine in February:
7h and 3min - Average sunshine in March:
7h and 1min - Average sunshine in April:
6h and 4min - Average sunshine in May:
5h and 4min - Average sunshine in June:
5h and 0min
- Average sunshine in July:
6h and 0min - Average sunshine in August:
4h and 4min - Average sunshine in September:
4h and 0min - Average sunshine in October:
4h and 3min - Average sunshine in November:
5h and 3min - Average sunshine in December:
6h and 5min
The month with the most sunshine is February (Average sunshine: 7h and 30min).
The month with the least sunshine is September (Average sunshine: 4h and 0min).
Average sunshine days
Longwood, Saint Helena, Ascension and Tristan da Cunha
- Average sunshine days in January:
8.8 days - Average sunshine days in February:
7.2 days - Average sunshine days in March:
9.3 days - Average sunshine days in April:
10.5 days - Average sunshine days in May:
13.2 days - Average sunshine days in June:
8.2 days
- Average sunshine days in July:
9.3 days - Average sunshine days in August:
7.3 days - Average sunshine days in September:
7.7 days - Average sunshine days in October:
10.3 days - Average sunshine days in November:
10.6 days - Average sunshine days in December:
8.5 days
The month with the most sunshine days is May (13.2 days).
The month with the least sunshine days is February (7.2 days).
Average UV index
Longwood, Saint Helena, Ascension and Tristan da Cunha
The months with the highest UV index are January, February, March and May (UV index 6).
The months with the lowest UV index are August, September and October (UV index 4).
Average cloud cover
Longwood, Saint Helena, Ascension and Tristan da Cunha
The month with the most cloud cover is September (Cloud cover 74).
The month with the least cloud cover is February (Cloud cover 44).
Average visibility
Longwood, Saint Helena, Ascension and Tristan da Cunha
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
Longwood, Saint Helena, Ascension and Tristan da Cunha
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