April (+/- a week) doesn't fail to disappoint with the year's lowest relative humidity. At least in this part of the world.
Over the past few years I have noticed that April consistently creates the lowest RH. Today my weather station dropped to around 20% as the dewpoint fell close to 10F. In recent years I have recorded RH values below 10% in April.
This happens when a Canadian (Arctic air mass) invades the region. April's strong sunlight easily warms the air mass, but northerly winds prevent moisture from building. This leads to very dry weather and low RH values.
Not as exciting as a world record wind, but it's what happened in your backyard today.