General Temperatures and Differences
You will likely find less climate control (both heating and air conditioning) than you’re used to in the US. This is partially because electricity is generally more expensive in Ireland, and maybe because the Irish don’t mind a bit of exposure to the elements while saving Mother Earth a bit in the process.
Ireland uses Centigrade/Celsius for temperatures. To get a sense for what you’re experiencing when you’re given a temperature in Celsius that you want to convert to Fahrenheit, you can multiply the Celsius temperature by 1.8 then add 32. A mental math approach yielding a similar outcome would be to multiple by 2 and add 30 (or a bit less). Because Celsius operates with a smaller range of numbers, the specific number matters a bit more – different from saying “mid 70s” in Fahrenheit.
Some mental math conversion practice: 20 Celsius is pleasant (close to 70 Fahrenheit); 25 Celsius is warm (close to 80 Fahrenheit); and 30 Celsius is hot (close to 90 Fahrenheit). Since Ireland is a temperate country, you will consistently see temperatures in the 10-20 Celsius range.
Dublin experiences a maritime climate, classified by cool summers, mild winters, and a lack of temperature extremes. The average maximum January temperature is 8.8 °C (48 °F), while the average maximum July temperature is 20.2 °C (68 °F). On average, the sunniest months are May and June, while the wettest month is October with 76 mm (3 in) of rain, and the driest month is February with 46 mm (2 in). Rainfall is evenly distributed throughout the year.
Limerick’s climate is classified as temperate oceanic. Limerick has a mild climate, with the average daily maximum in July of 20 °C (68 °F) and the average daily minimum in January of 3 °C (37 °F). Limerick is the cloudiest city in the state, averaging only 1,295 sunshine hours annually, 3.5 hours of sunshine every day.