Many of these summability methods easily assign to 1 â 2 + 3 â 4 + ... a sum of 1â4 after all. Cesaro cesÃ ro summation is one of the few methods that do not sum â 1 + 2 â 3 + ... 4
However, despite this fine climate, many people prefer to visit Tallinn during April or May, when the fresh, spring weather is especially enticing. April features average daytime temperatures of 9Â°C / 48Â°F, with highs of more than 15Â°C / 59Â°F when May arrives.
Guide to Helsinki weather in May. The average maximum daytime temperature in Helsinki in May is a comfortable 15Â°C (59Â°F). The average night-time temperature is usually a cold 5Â°C (41Â°F). There are usually 8 hours of bright sunshine each day, which represents 48% of the 17 hours of daylight.