The change in season may naturally cause some additional aches and pains regardless of the work you do. Rain, humidity and temperature fluctuations common in springtime change the atmospheric pressure on our bodies, which can lead to swelling and pain in your joints.
Some find that their knees are especially susceptible to these weather changes. If you feel knee pain, consider using an ice pack for 15-20 minutes to help the swelling go down. Conversely, if your knees feel stiff, use a heating pad for 15-20 minutes to help loosen up before you get to work.