I have been scanning and listening on 145MHz for most of November 2016 so I now have a reasonable idea as to what the level of activity on the band is like. As expected, the level of local activity is very low and is mainly confined to mobile stations calling through the various repeaters.
The only real activity period is after the IRTS news broadcasts on Monday and Tuesday evenings.
This is a map of the repeaters that I have heard on 145 MHz under flat conditions...
These are the frequencies I have heard most activity on while listening to 145 MHz FM. The set up was pretty modest with just a home made half wave vertical antenna. The signals in Purple are those heard under lift conditions.
145.400 ... Used as a net frequency near Waterford city
145.450 ... Used as a net frequency in South Tipperary
145.475 ... Packet type signals from the Chinese Satellite Kaituo 1B. Norad ID 40912.
145.525 ... Used as a net frequency in Wexford
145.600 ... FM repeater. GB3WR nr Bristol. IO81PH. CTCSS F 94.8Hz.
145.6325 ... FM repeater. GB3DN. North Devon repeater. IO70UW. CTCSS 77Hz.
145.650 ... FM repeater. EI2DBR. Devil's Bit Repeater, Tipperary. IO62BU. Southern Ireland Repeater Network.
145.675 ... FM repeater. EI2HHR. Helvick Head Repeater. IO62EC. Southern Ireland Repeater Network.
145.675 ... FM repeater. EI2CCR. Clermont Carn Repeater, Co.Louth. IO64UB.
145.675 ... SSB on downlink from transponder on Chinese satellite XW-2A. Norad ID 40903.
145.6875 ... Digital repeater. No positive ID. Might be GB3WE? Weston Super Mare. IO81MH.
145.700 ... FM repeater. EI2TKR. Truskmore Repeater. Sligo. IO54TI. CTCSS 77 Hz.
145.700 ... FM repeater. GB3AR. Carmarthen Repeater. IO73VC. 110.9Hz.
145.725 ... FM repeater. EI2TAG. Tountinna, Tipperary. Limerick repeater. IO52TU.
145.725 ... Beacon on Chinese satellite XW-2B. Norad ID 40911.
145.725 ... FM repeater. GB3NC. North Cornwall repeater nr St.Austell. IO70OJ. CTCSS 77Hz.
145.750 ... FM repeater. EI2MGR. Mullaghanish, Co.Cork. IO51KX.
145.7625 ... FM repeater. GB3PL. East Cornwall. IO70VM. CTCSS 77Hz. ID is 'GB3PL Amateur Radio Repeater'.
145.775 ... FM repeater. GB3WW. West Wales repeater. IO81CP. CTCSS F 94.8 Hz.
145.775 ... FM repeater. GB3WT. West Tyrone. IO64JQ. Nr Omagh. CTCSS 110.9Hz.
While this list is unique to my location, it should give a general guide as to what can be heard if you are living near Cork. You may well hear other repeaters but this is a good list to start with and it's a guide on where to listen.