...But it has nothing to do with lilacs. It's the reversion of the promise of springtime to the reality of late-winter weather. It's 70F one day to 40F the next. It's the oak pollen (in my case) or whatever YOUR "favorite" allergy is -- intrinsically debilitating, and necessitating sedating antihistamines when trying to counteract it. It's the chilly humidity that gets in your bones and also breeds molds and fungi ... including systemic candida.
Springtime makes you turn off the furnace and open the windows, then gets cold again. Then it's "should I restart the heater, or hang in there?" ... cuz you KNOW that if you re-light the furnace, the weather will get warm again, and if you don't you'll just want to huddle inside a blanket on the sofa as the cold wave lingers on....
Spring rains raise your emotional stress -- work/school commuting is harder -- and also your physical stress as mentioned above. Knowing how to dress when you leave the house in the morning can be tricky. Sunny warm spring days bring people out en masse, whose noise and boisterousness tend to take the pleasure out of a stroll at the MoBot, Shaw Nature Reserve, or Forest Park. Why is it acceptable to let your children SCREAM in public for no reason? My kids AND grandkids learned the story of The Boy Who Cried Wolf before this ever became a habit with them.
When the vernal equinox rolls around, an awful lot of us in the temperate zone are ready for more light, more warmth, and the pleasures of fresh air and brightly-hued Nature. Unfortunately, there can be quite a wait before she's ready to reward us with her gifts.
I'll just sit here in the cold, damp gloom and be glad that May is almost upon us.