Slovene months

Slovene months have standard modern names derived from Latin names, as in most European languages. There are also archaic Slovene month names, mostly of Slavic origin, which exist in both a standardized set as well as many variations. 
Standard modern names.
The standard modern Slovene month names are "januar", "februar", "marec", "april", "maj", "junij", "julij", "avgust", "september", "oktober", "november", and "december". When writing dates, they appear after the day and are often represented by Arabic numerals, and sometimes with Roman numerals (e.g., "19. 5." or "19. V." 'May 19th'). Older variants include "januvarij" 'January', "februvarij" 'February', and "marcij" 'March'.
Standard archaic names.
Many of the names in the standardized set of archaic Slovene month names first occur in the Škofja Loka manuscript, written in 1466 by Martin of Loka.
Variant archaic month names.
Multiple systems have been used in various Slovene-speaking regions, some of which were based on the names of saints (e.g., "jurjevščak" 'April', literally 'St. George's'), numbers (e.g., "prvnik" 'January', literally 'first'), or other features (e.g., "vetrnik" 'March', literally 'windy'). In the Prekmurje dialect of Slovene, the following system was attested: "sečen" 'January', "süšec" 'February', "mali traven" 'March', "velki traven" 'April', "risalšček" 'May', "ivanšček" 'June', "jakopešček" 'July', "mešnjek" 'August', "mihalšček" 'September', "vsesvišček" 'October', "andrejšček" 'November', "božič" 'December'.
By month.
Additional names include "brumen" (< Italian "bruma" 'depth of winter'), "sečen" (related to "suh" 'dry' or from "sek-" 'cut'), "ledenec" and "lednik" (< "led" 'ice'), "mali božičnjak" and "malobožičnjak" (< "mali božič" 'Epiphany'), "prozimec" (probably contamination of "prosinec" with "zima" 'winter'), "prvnik" (< "prvi" 'first'), and "zimec" (< "zima" 'winter'). The name "prosinec", associated with millet bread and the act of asking for something, was first written in the Škofja Loka manuscript.
Additional names include "sečan" and "sečen" (both related to "suh" 'dry' or from "sek-" 'cut'), and "sečni mesec" (< "sek-" 'cut'). The name "svečan" may relate to icicles or Candlemas. This name originates from "sičan", written as "svičan" in the "New Carniolan Almanac" from 1775 and changed to its final form by Franc Metelko in his "New Almanac" from 1824. The name was also spelled "sečan", meaning "the month of cutting down of trees". In 1848, a proposal was put forward in "Kmetijske in rokodelske novice" by the Slovene Society of Ljubljana to call this month "talnik" (related to ice melting), but it has not stuck. The idea was proposed by the priest and patriot Blaž Potočnik. A name of February in Slovene was also "vesnar", after the mythological character Vesna.
Additional names include "brezen" and "breznik" (both from "breza" 'birch'), "ebehtnik" (< Middle High German "ebennaht" 'equinox'), "gregorščak" (< "Gregor" '(Saint) Gregory'), "marcij", "postnik" (< "post" 'Lent'), "traven" (< "trava" 'grass'), and "tretnik" (< "tretji" 'third'). The name "sušec" was first written in the Škofja Loka manuscript.
Additional names include "brezen" (< "breza" 'birch') and "jurijevščak" (< "Jurij" '(Saint) George'). The name "mali traven" was first written in the Škofja Loka manuscript.
Additional names include "cvetičnik" and "cvetnar" (both < "cvet" 'flower'), "majnik", "mlečen" (< "mleč" 'chicory'), "risalščak" and "rusalščak" (< "risale/rusale" 'Pentecost'), "rožni mesec" (< "roža" 'flower'), and "sviben" (< "sviba" '(flowering of) dogwood'). The name "veliki traven" was first written in the Škofja Loka manuscript.
Additional names include "bobov cvet" (literally, 'broad bean blossom') "ivanjščak" and "šentjanževec" (both referring to Saint John's Day), "klasen" (< "klas" 'head of grain'), "kresnik" (< "kres" 'bonfire', referring to Midsummer), "prašnik" (literally, 'stamen'), "rožencvet" and "rožni cvet" (both 'flower blossom'), and "rženi cvet" ('rye blossom').
Additional names include "jakobnik" and "jakobščak" (both referring to Saint James's Day), "pšeničnik" (< "pšenica" 'wheat'), and "žetnik" (< "žetev" 'reaping').
Additional names include "kolovožnjak", "medmašnik", "mešnjak", "otavnik", "porcijunkula", "velikomašnjak", and "vršenj".
Additional names include "jesenik", "jesenščak", "kozoprsk", "miholščak", "poberuh", and "šmihelščnik".
Additional names include "kozoprsk", "listopad", "lukovščak", "moštnik", "obročnik", "repar", "repnik", "vinec", and "vinščak".
Additional names include "andrejščak", "gnilolist", "listognoj", "martinščak", "vsesvečnjak", and "vsesvečak".
Additional names include "kolednjak" and "veliki božičnjak" (< "božič" 'Christmas').