Korea Herald: This year’s spring was cooler than usual. The average temperature in April was 9.9 degrees Celsius, the lowest since 1973. There was also less sunshine this spring. The country saw an average total of 176.5 hours sunshine in April, far below the usual 215 hours. In Busan, the city’s March sunshine duration was 117.4 hours, the shortest since the national weather agency started weather observations in 1905. Summer, however, was the second hottest in 37 years. The …