![]() ![]() ![]() 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 The graph at the top of this post shows the twenty and thirty-year rolling averages of the percent of years with a high of 66º or lower along with the number of days with a high of 66º or lower per year.Past Weather Agrometeorological Bulletins Even if it is, it is nowhere near the record earliest last 66º or cooler day, that trophy goes to the year 1972 when the last day was Feb 2nd! So remember, it can always be worse! If you are more of a glass-half-empty kind of person, there is a 65% chance that March 26th was indeed the coolest temperature the Valley will see until Fall. ![]() That means there is about a 35% chance Phoenix could see the high drop to 66º or lower before summer. In the past twenty years (2001-2020), the high has only dropped to 66º or below, seven out of those twenty years. Ok, now to the bad news, so you may want to stop reading if heat makes you uncomfortable. Also, just last year, the Valley of the Sun recorded a high of 66º on March 27th. In 1922, the high temperature on May 10th came in at 65º, which is the record for the latest 66º or cooler high temperature (going from Spring into Summer). The good news, high temperatures have been 66º or cooler past March 26th before. We all know summer is fast approaching, and the closer it gets, a question always comes up: will this be the coolest day until next Fall? After all, the high temperature today (March 26th) in Phoenix was a nice 66º! ![]()
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