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#astronomy December climate in Armagh – Astronotes

January 12, 2021 - Comment

COOLEST DECEMBER FOR SIX YEARS, SLIGHTLY SUNNIER AND WETTER THAN AVERAGE.  CALENDAR YEAR 2020 WARMER AND SLIGHTLY WETTER AND SUNNIER THAN AVERAGE. Armagh Observatory reviews that December 2020 was cooler than common at Armagh, the good December for six years, and barely sunnier and wetter than common.  Calendar 12 months 2020 was hotter than common


COOLEST DECEMBER FOR SIX YEARS, SLIGHTLY SUNNIER AND WETTER THAN AVERAGE.  CALENDAR YEAR 2020 WARMER AND SLIGHTLY WETTER AND SUNNIER THAN AVERAGE.

Armagh Observatory reviews that December 2020 was cooler than common at Armagh, the good December for six years, and barely sunnier and wetter than common.  Calendar 12 months 2020 was hotter than common and barely wetter and sunnier.

The imply month-to-month temperature was four.eight C (40.6 F), which is roughly zero.2 C hotter than the long-term (1796-2010) December common at Armagh however zero.1 C cooler than the newest (1981-2010) 30-year common.

The very best most air temperature was 11.7 C, which occurred shortly after midnight on the evening of the 17th/18th December and once more shortly after noon on the 18th.  The bottom most air temperature was three.5 C on the third, adopted by four.zero C shortly after midnight of the evening of the 27th/28th.  The very best minimal air temperature was 7.2 C on the morning of the 14th, adopted by 6.eight C which occurred throughout early afternoon of the 10th.  The bottom minimal air temperature was -2.7 C recorded on the morning of the sixth adopted by -2.6 C on the seventh. 

There have been 25 floor frosts, the sharpest of which have been -13.1 C recorded on the 30th and -12.four C on the 29th.  There have been six nights with minimal air temperatures lower than or equal to zero. Christmas Day was cooler than common with a median temperature of four.2 C.

Whole December precipitation was 80.25 mm (three.16 inches) together with 5 hint values, or 80.zero mm if hint values are ignored.  That is practically four% greater than the typical December rainfall at Armagh, making this December barely wetter than common.  The wettest day was the 26th with 14.four mm (zero.57 inches) of rainfall related to Storm Bella, adopted by the 15th with 10.1 mm (zero.40 inches).   Sleet and snow have been recorded on the 27th, with snow in a single day on the 30th/31st resulting in a lightweight masking of snow on the 31st.

With a complete of 42.four hours of sturdy sunshine, December 2020 was barely sunnier than common with roughly 12% extra sturdy sunshine than the long-term (1881-2010) December common at Armagh and practically 5% greater than the newest (1981-2010) 30-year common.  The sunniest day was the 20th with 5.three hours of sturdy sunshine, adopted by the 12th with four.9 hours.

Contemplating the 12 months as a complete, calendar 12 months 2020 at Armagh was hotter (common temperature 10.23 C), barely wetter (whole rainfall 858.15 mm together with 43 hint values) and barely sunnier (1318.7 hours of sturdy sunshine) than common.  Nonetheless, the yearly common masks substantial month-to-month and differences due to the season, for instance February 2020 was very moist, resulting in winter 2019/2020 being quite wetter than common, whereas March was comparatively dry and April and Could each very dry.  This led to a record-breaking spring, the sunniest spring on document at Armagh (that’s, for at the very least 140 years) and the driest for 74 years, that’s, since spring 1946.  This was the sixth-driest spring at Armagh since each day rainfall information started on the Observatory in 1838.

The dry and exceptionally sunny spring was adopted by June, July and August every duller and wetter than common.  June and August have been hotter than common, however July was comparatively cool, the good July at Armagh for 5 years.  June was additionally the dullest at Armagh for eight years and July the dullest for 34 years. Taking the three summer season months collectively, summer season 2020 was the good at Armagh since summer season 2015, the wettest since 2012 and the dullest, that’s, with the fewest hours of sturdy sunshine, since 1987.  This was the third dullest summer season at Armagh on document, that’s, since each day sunshine information started at Armagh in April 1880.  Taking the next months September, October and November collectively, the meteorological autumn was delicate and barely drier and sunnier than common.

The Observatory’s climate information additionally present that 2020 was quite hotter than common, the tenth-warmest calendar 12 months on document at Armagh.  13 of the final 20 years have imply annual temperatures at Armagh larger than 10.zero C, a consequence that features every of the final 5 years. 

Contemplating the 4 most up-to-date 30-year temperature averages, the 1961-1990 30-year imply annual temperature was 9.24 C whereas the 1991-2020 common was 9.94 C, a rise of zero.7 C in thirty years. 

Nonetheless, the rise in imply annual temperature at Armagh just isn’t uniform all year long, however extra strongly targeting the winter months January and February on the expense of June and July.  In the identical manner, following a prolonged interval of comparatively dry Julys at Armagh, lasting from roughly 1955 to 2005, it seems that the typical July rainfall could now be returning to the marginally wetter long-term imply. 

These sorts of element illustrate the complexity of assessing the importance of developments, or obvious developments, in Northern Eire’s local weather on human timescales, notably given the broader context of regional and world local weather change.  This highlights the significance of sustaining long-term local weather information corresponding to these at Armagh Observatory. 

The connected Figures present respectively the imply annual temperature recorded at Armagh from 1796 to 2020, the entire annual precipitation from 1838 to 2020, and the annual variety of hours of sturdy sunshine from 1881 to 2020.  In broad phrases they present important year-to-year variability, a wide range of multi-decadal oscillations, a common growing pattern in common temperature contrasting with a roughly fixed degree of annual precipitation, and a rise in sturdy sunshine reversing a long term earlier downward pattern.

These knowledge check with observations at Armagh Observatory, which has been recording the climate at Armagh since 1795.



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