Read this: Its average annual temperature is 18.4 °C (65.1 °F). 22.8 °C (73.0 °F) during the day and 13.8 °C (56.8 °F) at night. In the coldest month – January, the maximum temperature typically during the day ranges from 13 to 21 °C (55 to 70 °F), the minimum temperature typically at night ranges from 4 to 12 °C (39 to 54 °F). In the warmest month – August, the maximum temperature during the day typically ranges from 28–34 °C (82–93 °F), about 23 °C (73 °F) at night. Generally, temperatures similar to those experienced in the northern part of Europe in summer last about 8 months, from April to November. March is transitional, the temperature often exceeds 20 °C (68 °F), with an average temperature of 19.0 °C (66 °F) during the day and 10.0 °C (50 °F) at night. December, January and February are the coldest months, with average temperatures around 17 °C (63 °F) during the day and 7 °C (45 °F) at night. Valencia has one of the mildest winters in Europe, owing to its southern location on the Mediterranean Sea and the Foehn phenomenon. The January average is comparable to temperatures expected for May and September in the major cities of northern Europe.

In northern Europe, which months have temperatures similar to Valencia's in January?
What is the answer? (If it cannot be answered, return "unanswerable")
May and September