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Armagh Observatory - weather records

4/29/2017

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The weather records can be downloaded here.
Armagh Observatory has been taking manual weather observations for more than 200 years, see this BBC story.
Northern Ireland has a reputation for bad weather, the climate here is cool, often cloudy and quite wet. But on the plus side we don't get hurricanes, snow storms, high humidity or freezing temperatures. 
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The above graph shows the seasonal variation in max temperature. Note that most of the time it is less than 20 Celcius.
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Occasionally in January, February, March, November and December the temperature will drop below zero Celsius but  most of the time it is above freezing.
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Seasonal variation in rainfall is less noticeable than temperature - basically each season can be wet., but winters are usually wetter.
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Sunshine can be a rare thing in Ireland, the seasonal variation is clear.

Evidence of climate change?

The following graphs do suggest changes possibly indicating climate change.
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The above graph shows that since the mid-1970s the number of times the annual max temperature gets above 21 Celsius has increased.
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The above graph shows that since 1990 the number of times air frost days per year is above 45 days has decreased.
​These last two graphs might indicate a warming of the climate.
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