It depends on how many inches of water/melted snow it got; how much water accumulates in the spot & for how long; and how well your soil drains. You can monitor the soil moisture using the finger method (insert a finger into the soil to a depth of about 4" to see if the soil fails dry, moist or wet). If you notice that it is wet for extremely long periods then that could expose the roots to problems such as inability to uptake some oxygen or to root rot. Good drainage would then help. But those wet conditions would raise a yellow flag and make me frequently ck with the finger method. In such cases, you could try to channel the water elsewhere, remove the mulch so the moisture evaporates a tad faster but, good drainage is what would reeeeeally help. Just remember to put back the mulch when things settle down. If really concerned about a plant that is deteriorating, dig it out of those wet conditions and temporarily put in a pot.

I had quite a lot of rain several years ago due to El Nino. It rained 2-3 times per week and each storm delivered several inches. This went on from March-ish and stopped around late June to July. Even though I have clay soil, the macs, arborescens and paniculatas did fine but I lost one oakleaf hydrangea to root rot because it was in a hidden location and water collected there. I never noticed it since it rained so much I stopped going there much. Had to have a landscape company fix drainage there. You may want to ck with a landscape company too, before April arrives.

IME, as long as the plant is dormant and it's only a couple of weeks, it should be OK since H. arborescens is at least tolerant of damp soil. I wouldn't want to try that with a plant that requires well-drained soil.