If you don't know what you should be giving, you really should talk to your vet. Recommendations are based upon specific situations and environmental risk factors so there isn't a "one-size-fits-all" program.
That being said, I assume that your mosquito season is not in the middle of winter and isn't more than 6 months long in your location so I'm unsure why your vet would be giving WNV in the fall. (I could be wrong though.) WNV vaccines are recommended to be given in the early spring at least 2 weeks before mosquito season so that you have the highest levels of circulating antibodies in the system during the time when mosquito-borne diseases are most likely to be contracted. WNV are proven effective for 1 year, but can be given more often. In fact, in the southern states like Florida, Louisiana, Texas, etc it is often recommended to booster every 6 months because our mosquito season lasts all year round. So, you could booster now and again in the fall and keep doing it twice a year or you could booster now and then not in the fall and get yourself on a once a year plan doing it in the spring or you could just continue to booster once a year in the fall.
Flu/Rhino vaccines aren't effective for a full year. Recommendations for how often to give them yearly depend on situation (boarding, showing, etc) and which particular vaccine was given. Some of the vaccines only provide protection for 3-4 months while some of the newest ones provide protection for about 6 months.
Licensed Veterinary Technician