In November the temperatures in Cracow should vary between 5 - 15 degrees Celsius during the day and 1 - 5 at night.  An umbrella, jacket, coat or raincoat can be useful.
More details on weather in Krakow: http://www.meteoprog.pl/en/review/Krakow/#detail , http://pogoda.ekologia.pl/Pogoda_listopad/Krakow
 

Poland area code: 0048
Kraków area code: +48 12

Police: 997
Ambulance: 999
Fire Brigade: 998
Emergency number to dial from mobile telephones: 112 (no prefix is necessary, can be dialed even without an active SIM card)
Cracow City Guards: 986

Medical information: +48 12 661 22 40
Toxicological Intervention Emergencies: +48 12 411 99 99

Directory enquiries for TP S.A. (Polish Telecom) numbers: 118 913
International directory enquiries for TP S.A. (Polish Telecom) numbers: 118 912
Directory enquiries in English: 118 811
Directory enquiries in German: 118 000
Directory enquiries in Russian: 118 712

Poland is a member state of the European Union. Citizens of some non-EU countries may need a visa. Relevant information will be found at the Ministry of Foreign Affairs of the Republic of Poland site: http://www.msz.gov.pl/en/travel_to_poland/visa/visa . Please take visa processing times into account.

Polish currency is the Polish zloty (abbreviation - zł). It's international code is PLN.
1 złoty = 100 groszy (abbreviation - gr). Coins are: 1, 2, 5, 10, 20, 50 gr, and 1, 2, 5 zł. There are also 10, 20, 50, 100 and 200 banknotes.

Foreign currency can be exchanged at airports, hotel receptions and banks and in many small exchange offices called "kantor" located all around the city centre. Currency exchange rates are available from the National Bank of Poland (NBP) - http://www.nbp.pl/homen.aspx?f=/srodeken.htm , daily newspapers, internet portals and banks.
International credit cards (VISA, Mastercard or Eurocard) are accepted in the majority of hotels, shops and restaurants, they can also be used in most cash machines (bankomat).