One option to solve this is to use a State Block that compares the inputs -
Input AI1: Temperature trigger less than 3° with
Input AI2: Time input is greater than 6:30am
Temperature Input - This can use the Analogue Watchdog Block. The value TL is set to your 3°. Value TU set to something that will never be reached. ie. 99°. Whenever the temperature goes below 3°, 'Switch (ON/OFF)' is set to ON. Each day at dusk, the Switch (ON/OFF) is reset. You can find the 'Pulse for Dusk' in the Periphery tree under 'Times'.
Time Input - From the Periphery tree under 'Times', use the 'Minutes past midnight'. 6:30am = 390minutes.

With the second set of notifications, the use of the State Block is also warranted. You can use up to 4 inputs. ie. 'Daylight' from Times in Periphery, a 'Maintenance Counter' for window opening time etc.