International Journal of Biometeorology

, Volume 51, Issue 5, pp 395–403 | Cite as

Effects of temperature variation on suicide in five U.S. counties, 1991–2001

  • P. G. DixonEmail author
  • A. N. McDonald
  • K. N. Scheitlin
  • J. E. Stapleton
  • J. S. Allen
  • W. M. Carter
  • M. R. Holley
  • D. D. Inman
  • J. B. Roberts
Original Article


Effects of weather variables on suicide are well-documented, but there is still little consistency among the results of most studies. Nevertheless, most studies show a peak in suicides during the spring season, and this is often attributed to increased temperatures. The purpose of this study is to test the relationship between monthly temperature and monthly suicide, independent of months or seasons, for five counties located across the United States. Harmonic analysis shows that four of the five counties display some seasonal components in the suicide data. However, simple linear regression shows no correlation between suicide and temperature, and discriminant analysis shows that monthly departure from mean annual suicide rates is not a useful tool for identifying months with temperatures that are colder or warmer than the annual average. Therefore, it appears that the seasonality of suicides is due to factors other than temperature.


Suicide Bioclimate Seasonality 


  1. Breuer HW, Breuer J, Fischbach-Breuer BR (1986) Social, toxicological and meteorological data on suicide attempts. Eur Arch Psychiatry Neurol Sci 235:367–370PubMedCrossRefGoogle Scholar
  2. Bridges FS, Yip PS, Yang KC (2005) Seasonal changes in suicide in the United States, 1971 to 2000. Percept Motor Skills 100:920–924PubMedCrossRefGoogle Scholar
  3. Chew KSY, McCleary R (1995) The spring peak in suicides: a cross-national analysis. Social Sci Med 40:223–230CrossRefGoogle Scholar
  4. Chiu LPW (1988) Do weather, day of the week, and address affect the rate of attempted suicide in Hong Kong? Soc Psychiatry Psychiatr Epidemiol 23:229–235PubMedCrossRefGoogle Scholar
  5. Deisenhammer EA (2003) Weather and suicide: the present state of knowledge on the association of meteorological factors with suicidal behaviour. Acta Psychiatr Scand 108:402PubMedCrossRefGoogle Scholar
  6. Deisenhammer EA (2004) Reply: weather, climate, and suicidality. Acta Psychiatr Scand 109:319–320CrossRefGoogle Scholar
  7. Deisenhammer EA, Kemmler G, Parson P (2003) Association of meteorological factors with suicide. Acta Psychiatr Scand 108:455–459PubMedCrossRefGoogle Scholar
  8. Digon E, Bock HB (1966) Suicides and climatology. Arch Environ Health 12:279–286PubMedGoogle Scholar
  9. Dixon KW, Shulman MD (1983) A statistical investigation into the relationship between meteorological parameters and suicide. Int J Biometeor 27:93–105CrossRefGoogle Scholar
  10. Driscoll DM (1971) The relationship between weather and morality in ten major metropolitan areas in the United States, 1962–1965. Int J Biometeor 15:23–29CrossRefGoogle Scholar
  11. Gabennesch H (1988) When promises fail: a theory of temporal fluctuations in suicide. Soc Forces 67:129–145CrossRefGoogle Scholar
  12. Geltzer AJ, Geltzer AM, Dunford RG, Hampson NB (2000) Effects of weather on incidence of attempted suicide by carbon monoxide poisoning. Undersea Hyperbaric Med 27:9–14Google Scholar
  13. Lambert G, Reid C, Kaye D, Jennings G, Esler M (2003) Increased suicide rate in the middle-aged and its association with hours of sunlight. Am J Psychiatry 160:793–795PubMedCrossRefGoogle Scholar
  14. Lester D (1986) Suicide and homicide rates: their relationship to latitude and longitude and to the weather. Suicide Life-threatening Behav 16:356–359Google Scholar
  15. Lester D (1999) Climatic data and national suicide and homicide rates. Percept Motor Skills 89:1036PubMedGoogle Scholar
  16. Linkowski P, Martin F, Maertelaer VD (1992) Effect of some climatic factors on violent and non-violent suicides in Belgium. J Affective Disorders 25:161–166CrossRefGoogle Scholar
  17. Maes M, Meyer FD, Thompson P, Peeters D, Cosyns P (1994) Synchronised annual rhythms in violent suicide rate, ambient temperature and the light-dark span. Acta Psychiatr Scand 90:191–196Google Scholar
  18. Meares R, Mendelsohn FA, Milgron-Friedman J (1981) A sex difference in the seasonal variation of suicide rate: a single cycle for men, two cycles for women. Brit J Psychiatry 138:321–325Google Scholar
  19. Nayha S (1982) Autumn incidence of suicides re-examined: data from Finland by sex, age and occupation. Br J Psychiatry 141:512–517PubMedCrossRefGoogle Scholar
  20. Nicholls N, Butler CD, Hanigan I (2006) Inter-annual rainfall variations and suicide in New South Wales, Australia, 1964–2001. Int J Biometeor 50:139–143CrossRefGoogle Scholar
  21. Papadopoulos FC, Frangakis CE, Skalkidou A, Petridou E, Stevens RG, Trichopoulos D (2005) Exploring lag and duration effect of sunshine in triggering suicide. J Affective Disorders 88:287–297CrossRefGoogle Scholar
  22. Parker G, Walter S (1982) Seasonal variation in depressive disorders and suicidal deaths in new South Wales. Br J Psychiatry 140:626–632PubMedGoogle Scholar
  23. Partonen T, Haukka J, Pirkola S, Isometsä E, Lönnqvist J (2004a) Time patterns and seasonal mismatch in suicide. Acta Psychiatr Scand 109:110–115PubMedCrossRefGoogle Scholar
  24. Partonen T, Haukkaa J, Nevanlinnab H, Lönnqvista J (2004b) Analysis of the seasonal pattern in suicide. J Affective Disorders 81:133–139CrossRefGoogle Scholar
  25. Patz JA, Campbell-Lendrum D, Holloway T, Foley JA (2005) Impact of regional climate change on human health. Nature 438:310–317PubMedCrossRefGoogle Scholar
  26. Pokorny AD (1966) Suicide and weather. Arch Environ Health 13:225–256Google Scholar
  27. Pokorny AD, Davis F, Harberson W (1963) Suicide, suicide attempts, and weather. Am J Psychiatry 120:377–381PubMedGoogle Scholar
  28. Preti A (1997) The influence of seasonal change on suicidal behaviour in Italy. J Affective Disorders 44:123–130CrossRefGoogle Scholar
  29. Preti A, Miotto P (2000) Influence of method on seasonal distribution of attempted suicides in Italy. Neuropsychobiology 41:62–72PubMedCrossRefGoogle Scholar
  30. Rock D, Greenberg DM, Hallmayer JF (2003) Increasing seasonality of suicide in Australia 1970–1999. Psychiatry Res 120:43–51PubMedCrossRefGoogle Scholar
  31. Salib E (1997) Elderly suicide and weather conditions: Is there a link? Int J Geriatric Psychiatry 12:937–941CrossRefGoogle Scholar
  32. Salib E, Gray N (1997) Weather conditions and fatal self-harm in North Cheshire 1989–1993. Br J Psychiatry 171:473–477PubMedCrossRefGoogle Scholar
  33. Schory TJ, Piecznski N, Nair S, El-Mallakh RS (2003) Barometric pressure, emergency psychiatric visits, and violent acts. Can J Psychiatry 48:624–627PubMedGoogle Scholar
  34. Sher L (2004) Weather, climate, and suicidality. Acta Psychiatr Scand 109:319PubMedCrossRefGoogle Scholar
  35. Souêtre E, Salvati E, Belugou JL, Douillet P, Darcourt G (1987) Seasonality of suicides: environmental, sociological and biological covariations. J Affective Disorders 13:215–225CrossRefGoogle Scholar
  36. Souêtre E, Wehr TA, Douillet P, Darcourt G (1990) Influence of environmental factors on suicidal behavior. Psychiatry Res 32:253–263PubMedCrossRefGoogle Scholar
  37. Thorson JA, Kasworm C (1984) Sunshine and suicide: possible influences of climate on behavior. Death Educ 8:125–136Google Scholar
  38. Tietjen GH, Kripke DF (1994) Suicides in California (1968–1977): absence of seasonality in Los Angeles and Sacramento counties. Psychiatry Res 53:161–172PubMedCrossRefGoogle Scholar
  39. Timmermans S (2005) Suicide determination and the professional authority of medical examiners. Am Sociol Rev 70:311–333CrossRefGoogle Scholar
  40. Wang YT, Wang D, Wang XY (1997) Suicide and Meteorological Factors in Huhhot, Inner Mongolia. Crisis 18:115–117PubMedGoogle Scholar
  41. Wilks DS (1995) Statistical methods in the atmospheric sciences. Academic Press. San Diego, CAGoogle Scholar
  42. Zung W, Green R, Durham N (1974) Seasonal variation of suicide and depression. Arch Gen Psychiatry 30:89–91PubMedGoogle Scholar

Copyright information

© ISB 2007

Authors and Affiliations

  • P. G. Dixon
    • 1
    Email author
  • A. N. McDonald
    • 1
  • K. N. Scheitlin
    • 1
  • J. E. Stapleton
    • 1
  • J. S. Allen
    • 1
  • W. M. Carter
    • 1
  • M. R. Holley
    • 1
  • D. D. Inman
    • 1
  • J. B. Roberts
    • 1
  1. 1.Department of GeosciencesMississippi State UniversityMississippi StateUSA

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