Don't know what your summers are like.
That being said, I have the Kilimanjaro, which is also FirstGear, and also touted as a 3-season jacket, like the Jaunt 2. No way in hell would I wear this in the summer (or for that matter, in spring or fall).
They both have good venting, and removable liners, and if you're only doing long slab rides with lots of airflow it *may* work for you in the warmer weather. Around town, IMHO, you'll broil in the warmer weather.
That being said, it's better protection than mesh (although, I've learned lots about mesh lately, and if you have the $$$ you can buy something like Air Mesh Kevlar, or Cordura 1000 - I use a mesh Cordura 500 for summer riding - price/performance trade off).
I know it's tough for some budgets, but when you have extreme temps, like where you live, you'll probably need two different temp-appropriate jackets.
2017 Pearl White 650[/B]
AdventureTech lowering links and GPS mount
AdventureTech +2" SS braided brake line
GPI spools, SW Motech risers
Givi XS307 Tanklock bag and Givi 46L top case
Suzuki hard case saddlebags