The first month of 2017 was drier and slightly cooler than average. Winds were much lighter than normal.
The highest temperature in the month was 10.6°C recorded at 05:54 on the 11th, with the coldest temperature being -3.9°C recorded at 03:01 on the 27th, the lowest temperature since -5.4°C was recorded on January 17th 2013. On the 26th, the temperature reached a maximum of 0.9°C at 01:01 before falling below freezing at 02:50. The temperature remained below freezing for the rest of the day, reaching a minimum of -2.9°C at 23:58.
The average temperature in the month was 3.6°C. The minimum temperature fell below freezing for five days between the 2nd and the 6th. This is the longest run of sub-zero temperatures since a five-day run ending on January 19th 2016. The average daily high was 6.0°C (mean 6.3°C), with the average daily low being 0.9°C (mean 1.3°C). The warmest days were the 7th and 8th which both recorded average temperatures of 7.0°C. The coldest day was the 26th when the average temperature was only -1.4°C. There were 13 frost days.
The highest dew point was 8.5°C at 14:39 on the 7th, with the lowest being -4.8°C at 04:01 on the 27th. The average monthly dew point was 2.3°C. The high wind chill was 9.4°C at 16:27 on the 15th, with the lowest being -6.5°C at 00:25 on the 27th. The monthly average wind chill was 2.4°C. There was 8.87 hours of sunshine, with the sunniest day being the 20th when 3.03 hours were recorded.
January 2017 was the driest January ever recorded here with only 20.6 millimetres being recorded, almost half of the average 41.0 millimetres. There were 18 rain days, with the wettest being the 3.6 millimetres recorded on the 15th. The highest rain rate was 6.4 mm/hr at 07:40 on the 1st. Only one millimetre of snow was recorded, on the 13th. This was the first snowfall since January 17th 2016.
High pressure dominated for most of the month with the highest barometric pressure being 1037.5 millibars at 10:10 on the 19th. The lowest pressure was 995.0 millibars at 20:02 on the 12th, with the month average being 1021.3 millibars. This was the highest ever average barometric pressure here in January, well above the average of 1012.0 millibars.
The average wind speed was 3 mph and the average gust speed 5 mph, both below average. The highest recorded gust speed was 36 mph at 04:51 on the 11th. The highest average wind speed was 20 mph at 06:24, also on the 11th. The wind run was 2424 miles, the lowest ever in January here. The dominant wind direction was 208°
The maximum solar radiation was 418 w/m² on the 28th with the average for the month being 21 w/m². The maximum U. V. Index was 0.5 on the 29th.