Individual years with different Koppen than long term average? (snow, hot, record)

[dunno what to put here]

Using the 0C threshold, we were Dfb in 2010.

If you considered semi-arid climates as rainfall below 500mm, then we were semi-arid last year, but using Koppen's formula, we weren't.

[Jakobsli]

Trondheim - individual years, using the -3C threshold in Köppen:

2013 - Dfb Humid Continental
2012 - Cfc - Subpolar oceanic
2011 - Cfb - Temperate oceanic
2010 - Dfc - Subarctic (by slightest possible margin, 0.1C)

So four different climate zones in the last four years!

2009 - Cfb
2008 - Cfb
2007 - Dfc
2006 - Dfb
2005 - Cfb
2004 - Dfb

[ksolina]

From 1961-1990, Zagreb is Cfb.

With the temperature threshold being 0c mean for subtropical/continental and 22c mean for hot/warm, here is 2000-2013:

2000 - Dfa

2001 - Cfa

2002 - Cfa

2003 - Dfa

2004 - Borderline Cfb/Dfb/Cfa/Dfa (0.0c mean in January and 21.9c in August)

2005 - Dfa

2006 - Dfa

2007 - Cfa

2008 - Cfa

2009 - Dfa

2010 - Dfa

2011 - Cfa

2012 - Dfa

2013 - Cfa

13 of the last 14 years have had a hottest summer month with a mean of 22c or higher (the average is 20.8c, and the summers have been about 1.5 degrees above average).

7 of the last 14 years have had a coldest winter month with a mean of 0c or less (the average is -0.1c, so it seems quite average. However, the winters have been about a degree warmer than average).

Only one year from the last 14 actually fits Koppen's classification (barely).

[Crunch41]

I live in a borderline Dfa/Dfb, the July average is 22.0C, so most years it is a Dfa or Dfb, depending on the July temperature.

1895 was somewhat close to the borderline for semiarid (BSk), since we only got 340mm, easily the driest on record and the annual average was 7.4C, so the threshold was about 290mm that year.

2002 met Cfa criteria by the -3 isotherm, a few other winters (1920-21, 30-31, 43-44, 91-92, and 11-12) came close.

Precipitation can vary widely and some years could technically fit dry summer or dry winter, but that doesn't really count because it would be due to one unusual month. For example, 2012 could technically fit Dsa since June had 0.3" and January 1.4", but July had 4". And 1981 saw .14" in January, 4.8" in July, so technically Dwb, but February had 2.4".

[Donar]

1963, the coldest year in history, was Dwb.

1994, the warmest year in history, was Cfa.

The climate charts:

Spoiler

[wawa1992]

1973-2013 data for Bowling Green, KY. Bowling Green, KY is a couple degrees colder than Nashville, TN on average, and I feel it's a better representative of White House, TN climate. (White House is on a hill about 400' higher elevation than Nashville, and about 30 miles north of Nashville)

Nominally, it's a Cfa.

1973 - Cwa (Feb too dry)
1974 - Cfa
1975 - Csa (June too dry)
1976 - Dsa (Aug too dry)
1977 - Dfa
1978 - Dsa (Apr too dry and warmer than Oct this year)
1979 - Dfa
1980 - Cwa (Dec too dry)
1981 - Dsa (Aug too dry)
1982 - Dfa
1983 - Dsa (Aug and Sep too dry)
1984 - Dfa
1985 - Dfa
1986 - Cfa
1987 - Cfa
1988 - Dfa
1989 - Dfa
1990 - Cfa
1991 - Cfa
1992 - Cfa
1993 - Cfa
1994 - Dfa
1995 - Cwa
1996 - Cfa
1997 - Csa (July too dry)
1998 - Csa (Aug and Sept too dry)
1999 - Csa (Aug too dry)
2000 - Dsa (Oct too dry, and warmer than Apr this year)
2001 - Cfa
2002 - Cwa (Feb too dry)
2003 - Dfa
2004 - Cfa
2005 - Csa (Oct too dry, and warmer than Apr this year)
2006 - Cfa
2007 - Csa (Aug too dry)
2008 - Csa (June and Aug too dry)
2009 - Cwa (Nov too dry)
2010 - Cfa
2011 - Csa (Aug too dry)
2012 - Csa (June too dry)
2013 - Cfa
2014 will be a D-type climate, due to the January average of 30 F / -1 C.

I was expecting the transition between D-type (continental) and C-type ("subtropical"), with a significant minority of years being D-type. Of the 42 years (including 2014), there have been 15 D-type years (36%) and 27 C-type years (64%). The 1976-1989 period was predominantly D-type and the climate was likely Dfa average during this period. I wasn't expecting the amount of winter/summer dry seasons, but it became clear to me that one dry month in a year was often enough to put into a dry season type. In particular, the number of Mediterranean type (Csa) years, especially since 1997, was staggering. We are nowhere near any Mediterranean climate areas; the closest is California.

Breakdown, 1973-2013:
Cfa - 1974, 1986, 1987, 1990, 1991, 1992, 1993, 1996, 2001, 2004, 2006, 2010, 2013 - 13 years (32%)
Csa - 1975, 1997, 1998, 1999, 2005, 2007, 2008, 2011, 2012 - 9 years (22%)
Cwa - 1973, 1980, 1995, 2002, 2009 - 5 years (12%)
Dfa - 1977, 1979, 1982, 1984, 1985, 1988, 1989, 1994, 2003 - 9 years (22%)
Dwa - None recorded YET.
Dsa - 1976, 1978, 1981, 1983, 2000 - 5 years (12%)

[Joe90]

Originally Posted by theropod

l).
To note, I usually don't consider yearly rainfall above 500mm to semi-arid, not unless if the places have a yearly average temp of 28-30C - in which the high evaporation rate helps.

Isn't spareness of vegetation and the moisture content of the soil, a better indication of semi-aridness. Much of the South Island east of the divide, has dry soil conditions and sparse conditions year round, even with rainfall exceeding 500 mm. Temperature alone isn't responsible for aridity. Moisture loss through wind, freezing temperatures and sunshine will have a similar effect.

[zeppelin171]

My town had a mild desert climate last year compared to our usually Mediterranean climate.

[Walshie79]

Normally Cfb but Dfb (0C threshold) in 2010, 1986 and 1979. One year (1963) even made the -3 threshold.

Csb was achieved in 1995, if April counts as a "winter" month 2007 was Cwb.

[B87]

We rarely depart from Cfb, but when we do it is either Csb or Csa.