Sunspot Number Daily, monthly and 13-month smoothed sunspot numbers for the past 13 years, and 12-month ahead predictions. Yearly mean and 13-month smoothed monthly sunspot number since 1700. Monthly and 13-month smoothed sunspot numbers over the last 6 cycles. North and South hemispheric sunspot numbers (13-month smoothed values) over the last 6 cycles. 12-month ahead predictions of the monthly smoothed Sunspot Number Standard Curves method (SC) Combined method (CM) McNish&Lincoln method (ML) Kalman-filter optimization of the 12-month ahead predictions Standard Curves method (SC) Combined method (CM) McNish&Lincoln method (ML)