Jump to content
Thunder?
Local
Radar
Pollen
IGNORED

1817: A very very odd year


Weather-history
 Share

Recommended Posts

Posted
  • Location: Irlam
  • Location: Irlam

    Another year from the past but this one is absolutely bizarre, 1817.Months compared to 1781-1810 average

    Jan: 4.5 (+1.6)

    Feb: 6.4 (+2.5)

    Mar: 5.5 (+0.9)

    Apr: 7.6 (-0.2)

    May: 8.7 (-2. :)

    Jun: 15.1 (+0.6)

    Jul: 14.1 (-2.0)

    Aug: 13.6 (-2.2)

    Sep: 13.2 (0.0)

    Oct: 6.4 (-3.0)

    Nov: 9.1 (+3. :)

    Dec: 2.5 (-0.7)

    The only instance of May being colder than November

    The second half of May 1817 was nearly a degree colder than the first half of November 1817

    May and October 1817 are the third and second coldest months respectively ever recorded for each of those months .

    November 1817 was the the 3rd warmest November ever recorded at the time

    The first half of October 1817 was 1.5C colder than the second half of November 1817

    The leap in CET between October and November 1817 is the largest ever record (+2.7)

    The leap between May and June 1817 is the largest ever recorded (+6.4)

    April 1817 was exceptionally dry, the driest on record until April 1938 but May was very wet.

    Autumn 1817 was until 1978 the driest autumn on record, whilst the summer is 8th wettest on record.

    All in all, a year with great variety. There are few years as ridiculous as 1817.

    Edited by Mr_Data
    • Like 1
    Link to comment
    Share on other sites

    Posted
  • Location: Cleeve, North Somerset
  • Weather Preferences: Continental winters & summers.
  • Location: Cleeve, North Somerset

    An interesting read Mr Data. How often do you think October is warmer than May? Wasn't that the case in 2005?

    Link to comment
    Share on other sites

    Posted
  • Location: Irlam
  • Location: Irlam
    An interesting read Mr Data. How often do you think October is warmer than May? Wasn't that the case in 2005?

    Yes it happened in 2005. Its about a 1 in 7 year occurrence.

    One thing I forgot to mention is that February had the same CET as October. February has never been warmer than October but the closest it came was in 1817

    February as warm as October

    May colder than November

    May, 6.4C colder than June

    October, 2.7C colder than November

    April was the driest on record at the time (now 2nd driest)

    Summer was the 3rd wettest on record (now 8th wettest)

    Autumn was the driest on record (now 2nd driest)

    An absolutely bizarre year

    Link to comment
    Share on other sites

    Posted
  • Location: Shrewsbury
  • Location: Shrewsbury
    An interesting read Mr Data. How often do you think October is warmer than May? Wasn't that the case in 2005?

    1996 and 2001 as well, 1994 and 1995 must have been close too?

    Has November ever been warmer than May (1994 can't have been much cooler) or October warmer than June?

    Link to comment
    Share on other sites

    Posted
  • Location: South Pole
  • Location: South Pole

    Looking at the wild swings in monthly temperatures in 1817, how much confidence do we actually have in the recording equipment of 200 years ago? Do these figures seem plausible? Is the series of such repute that we have to take this data as read? The autumn temps in particular look extraordinary.

    Edited by Nick H
    Link to comment
    Share on other sites

    Posted
  • Location: Lincoln, Lincolnshire
  • Weather Preferences: Sunshine, convective precipitation, snow, thunderstorms, "episodic" months.
  • Location: Lincoln, Lincolnshire

    October was definitely warmer than May in 1995 (May 11.6, October 12.9)

    In 1994 it wasn't, although it was a very close run thing. October 1994 had a very fine second week, but the start featured an exceptionally cold northerly, and the final third was rather cool, so the mean temperature was a little below average.

    Link to comment
    Share on other sites

    Posted
  • Location: Irlam
  • Location: Irlam
    Looking at the wild swings in monthly temperatures in 1817, how much confidence do we actually have in the recording equipment of 200 years ago? Do these figures seem plausible? Is the series of such repute that we have to take this data as read? The autumn temps in particular look extraordinary.

    The fact that it happened in that year and not really to any degree in previous years , I think we can have some confidence in the figures. If most years were showing wide fluctations back then, then I would question it but its statistically plausible. :)

    • Like 1
    Link to comment
    Share on other sites

    • 2 years later...
    Posted
  • Location: Taunton, Somerset
  • Weather Preferences: Snow, thunder, strong winds. HATE:stagnant weather patterns
  • Location: Taunton, Somerset

    Thanks for the info Mr_D. Really interesting stats, a very messed up year indeed, and with unusual variety!

    Link to comment
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
     Share

    ×
    ×
    • Create New...