Summer 2020
I did an early count-up for next summer's Ryanair number of rotations each week per month in the main summer period compared with summer 2019. I've included the new Lauda Vienna route because it's bookable in the Ryanair booking engine and one of the two weekly rotations will be operated by a Ryanair aircraft. Brest replaces Shannon at 2 x weekly each month with Shannon also 2 x weekly in summer 2019.
May
124 (+ 2 on 2019) Girona -3, Malaga - 1, Milan MXP + 1, Malta + 1, Krakow + 1, Dublin + 1, Vienna new route + 2
June
132 (+ 3) Girona - 1, Malaga - 1, Milan MXP + 1, Malta + 1, Krakow + 1, Vienna new route + 2
July
138 (+ 6) Alicante - 1, Malaga - 1, Girona + 1, Venice MP + 1, Milan MXP + 1, Cologne + 1, Malta + 1, Krakow + 1, Vienna new route + 2
August
138 (+ 6) Alicante - 1, Malaga - 1, Girona + 1, Venice MP + 1, Milan MXP + 1, Cologne + 1, Malta + 1, Krakow + 1, Vienna new route + 2
September
132 (+ 1) Alicante - 4, Malaga - 1, Girona + 1, Milan MXP + 1, Malta + 1, Krakow + 1, Vienna new route + 2
Out of interest May 2019 was 122 (+ 2 on May 2018), June was 129 (+ 8), July was 132 (+ 10), August was 132 (+ 7), September was 131 (+ 6)
Ryanair has grown a lot in recent winters with for example 15 routes and 55 weekly rotations in 15/16 to 25 routes and 90 weekly rotations in 18/19, but the perception has been of little growth in summer. Although the number of routes hasn't grown as much in summer as in winter it will be seen from the above that there has been a noticeable increase in summer rotations in the past couple of years. In fact, the number of summer rotations has been growing slowly from 27 in summer 2015 to 33 in summer 2019 and at the moment 34 in summer 2020 including the Lauda Vienna route.
It's likely that we shall see some increase in weekly rotations on some of the sun routes as the season approaches if last year is a guide.