More than half of stations reported air frost. The number of days with ground frost ranged from 3 days at Sherkin Island, Co Cork to 16 days at a few stations. All stations reported ground frost during the month. The month’s lowest air minimum was recorded on Monday 27th at Dublin Airport, Co Dublin with -4.3 ☌ while the lowest grass minimum was -11.1 ☌ reported at Markree, Co Sligo on Wednesday 8th. The month’s highest temperature was reported at Phoenix Park, Co Dublin on Wednesday 29th with a temperature of 17.1 ☌. Mean temperatures for the month ranged from 6.0 ☌ (0.3 ☌ above its LTA) at Knock Airport, Co Mayo to 8.4 ☌ (0.1 ☌ below its LTA) at Sherkin Island, Co Cork. Deviations from mean air temperature for the month ranged from -0.3 ☌ (6.6 ☌ mean temperature) at Markree, Co Sligo to 1.1 ☌ (7.7 ☌ mean temperature) at Phoenix Park, Co Dublin. Nearly all mean air temperatures were above their LTA for the month. Temperature: Above average in most places after a cool start Total Monthly Rainfall (mm) for March 2023 (Provisional) Sherkin Island, Co Cork had its wettest March since 1989 with 179.6 mm and Moore Park, Co Cork had its wettest March since 1996 with 144.4 mm. Claremorris, Co Mayo had its wettest March since 1978 with 164.5 mm and Cork Airport, Co Cork had its wettest March since 1981 with 211.3 mm. Along with Dublin Airport, Phoenix Park, Co Dublin also had its wettest March since 1947 with 121.3 mm. These were Athenry, Co Galway with 185.9 mm (record length 32 years), Mace Head, Co Galway with 151.2 mm (length 18 years), Mount Dillon, Co Roscommon with 169.8 mm (length 18 years) and Casement Aerodrome, Co Dublin with 109.3 mm (length 59 years). Four stations had their wettest March on record. The number of very wet days ranged from zero days at Finner, Co Donegal to 10 days at Valentia Observatory, Co Kerry. The number of wet days ranged from 18 days at Malin Head, Co Donegal to 23 days at both Roche’s Point, Co Cork and Valentia Observatory, Co Kerry. The number of rain days ranged from 22 days at Claremorris, Co Mayo to 28 days at Oak Park, Co Carlow. The highest daily rainfall total was 34.7 mm at Cork Airport, Co Cork on Thursday 9th (its highest daily fall for March since 2013). Monthly rainfall totals were as much as 239.2 mm (193% of its LTA) at Valentia Observatory, Co Kerry (its wettest March since 1963). Percentage of monthly rainfall values ranged from 90% (the month’s lowest monthly rainfall total of 93.2 mm) at Finner, Co Donegal to 227% (monthly rainfall total of 119.3 mm) at Dublin Airport, Co Dublin (its wettest March since 1947). The majority of monthly rainfall totals were above their 1981-2010 Long-Term Average (LTA). Rainfall: Above average nearly everywhere, wettest in the South an East There was rain or showers on most days, heaviest in the South and East. This pattern continued for the rest of the month, with Atlantic low pressure systems to the west and southwest, steering numerous bands of rain, interspersed with showers, sometimes thundery, over the country in a relatively mild cyclonic airflow. It became milder towards the middle of the second week as another Atlantic low pressure system brought frontal rain and a tropical maritime air mass over the country from the southwest. The heavy rain, accompanied by strong easterly winds, turned to sleet and snow as it bumped into the cold arctic air mass over Ireland, leaving lying snow in many places. Storm Larisa, named by Meteo France, steered active weather fronts over the country from the south on Thurs-day 9th, as the low centre moved from west to east just to the south of the country. Towards the end of the first week, the high pressure system moved away, allowing a cold Arctic air mass to move south over the country, which clashed with Atlantic low pressure systems moving up from the southwest. During the first week, high pressure brought mostly dry, cool and cloudy conditions. High pressure to the north of Ireland at the beginning of March pulled away towards Greenland, allowing Atlantic low pressure systems to push in from the southwest and dominate for the rest of the month. Peer-reviewed journal articles by Met Éireann staff members Past Weather Agrometeorological Bulletins
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