If the soil is not frozen, consider digging beds and borders over thoroughly.
If you want to improve your soil you should add and dig in a layer of organic matter.
Dry weather is no reason not to plant things in your garden. Simply dig a hole, fill it with water and then plant.
By digging compost into borders the water retention of the ground improves.
If you are planing to sow a lawn this spring, the ground needs to be prepared, dig it over and remove perennial weeds.