{
 "topic": "climate",
 "site": "climatedata.dev",
 "place": {
  "id": "isl",
  "name": "Iceland",
  "level": "country",
  "parent": "world",
  "path": "is",
  "slug": "is"
 },
 "question": "Was September normal in Reykjavík?",
 "answer": {
  "verdict": "Warmer than normal",
  "value": 8.27,
  "unit": "°C",
  "digits": 1,
  "label": "Average temperature in Reykjavík, September 2026",
  "lines": [
   "+0.5°C against the 1991–2020 normal of 7.7°C",
   "14th warmest September of 46 since 1981"
  ]
 },
 "as_of": "2026-09",
 "as_of_label": "September 2026",
 "charts": [
  {
   "id": "climate-history",
   "title": "Every September in Reykjavík since 1981",
   "description": "September 2026 averaged 8.3°C in Reykjavík, +0.5°C against its 1991–2020 normal: the 14th warmest September of 46 since 1981.",
   "indicator": "Monthly mean air temperature at 2 m, °C, at the capital's coordinates (NASA POWER, MERRA-2); normal = mean of the same month, 1991–2020",
   "subtitle": "Average air temperature at 2 m, °C. 2026 is highlighted; the line is the 1991–2020 normal.",
   "x": {
    "kind": "year"
   },
   "y": {
    "digits": 1,
    "unit": "°C"
   },
   "layers": [
    {
     "type": "dots",
     "name": "September average",
     "cls": "ctx",
     "points": [
      [
       1981,
       6.61
      ],
      [
       1982,
       5.25
      ],
      [
       1983,
       6.18
      ],
      [
       1984,
       7.16
      ],
      [
       1985,
       6.35
      ],
      [
       1986,
       6.97
      ],
      [
       1987,
       7.04
      ],
      [
       1988,
       6.42
      ],
      [
       1989,
       6.51
      ],
      [
       1990,
       6.28
      ],
      [
       1991,
       7.21
      ],
      [
       1992,
       6.02
      ],
      [
       1993,
       8.24
      ],
      [
       1994,
       6.71
      ],
      [
       1995,
       7.34
      ],
      [
       1996,
       9.63
      ],
      [
       1997,
       7.25
      ],
      [
       1998,
       7.38
      ],
      [
       1999,
       7.47
      ],
      [
       2000,
       7.92
      ],
      [
       2001,
       8.42
      ],
      [
       2002,
       8.4
      ],
      [
       2003,
       7.82
      ],
      [
       2004,
       8.51
      ],
      [
       2005,
       5.4
      ],
      [
       2006,
       9.28
      ],
      [
       2007,
       7.13
      ],
      [
       2008,
       8.71
      ],
      [
       2009,
       7.59
      ],
      [
       2010,
       9.07
      ],
      [
       2011,
       8.27
      ],
      [
       2012,
       6.58
      ],
      [
       2013,
       6.2
      ],
      [
       2014,
       8.57
      ],
      [
       2015,
       8.51
      ],
      [
       2016,
       7.68
      ],
      [
       2017,
       8.92
      ],
      [
       2018,
       6.6
      ],
      [
       2019,
       8.64
      ],
      [
       2020,
       6.76
      ],
      [
       2021,
       7.62
      ],
      [
       2022,
       9.01
      ],
      [
       2023,
       8.21
      ],
      [
       2024,
       6.38
      ],
      [
       2025,
       8.65
      ]
     ]
    },
    {
     "type": "rule",
     "name": "1991–2020 normal",
     "y": 7.74,
     "label": "normal 7.7°C"
    },
    {
     "type": "mark",
     "name": "September 2026",
     "series": "September average",
     "x": 2026,
     "y": 8.27,
     "label": "2026: 8.3°C"
    }
   ]
  },
  {
   "id": "climate-last12",
   "title": "The last 12 months against normal",
   "description": "5 of the last 12 months were warmer than their 1991–2020 normal and 7 cooler.",
   "indicator": "Monthly mean air temperature at 2 m minus that month's 1991–2020 normal, °C (NASA POWER via climatedata.dev)",
   "subtitle": "Difference from each month's 1991–2020 normal, °C. Above the line was warmer than normal.",
   "x": {
    "kind": "month"
   },
   "y": {
    "digits": 1,
    "unit": "°C",
    "format": "signed"
   },
   "layers": [
    {
     "type": "bars",
     "name": "Difference from normal",
     "base": 0,
     "points": [
      [
       24309,
       0.25,
       "warm"
      ],
      [
       24310,
       -0.82,
       "cool"
      ],
      [
       24311,
       2.27,
       "warm"
      ],
      [
       24312,
       -0.85,
       "cool"
      ],
      [
       24313,
       -1.93,
       "cool"
      ],
      [
       24314,
       -0.82,
       "cool"
      ],
      [
       24315,
       0.96,
       "warm"
      ],
      [
       24316,
       -0.17,
       "cool"
      ],
      [
       24317,
       0.52,
       "warm"
      ],
      [
       24318,
       -0.43,
       "cool"
      ],
      [
       24319,
       -0.08,
       "cool"
      ],
      [
       24320,
       0.53,
       "warm"
      ]
     ],
     "legend": [
      {
       "label": "Warmer than normal",
       "cls": "warm"
      },
      {
       "label": "Cooler than normal",
       "cls": "cool"
      }
     ]
    }
   ]
  }
 ],
 "limits": [
  "This is Reykjavík, Iceland's capital, not the whole country: one point of NASA POWER's grid (about 50 by 60 km), so a city's own heat island is not in it.",
  "MERRA-2 is a reanalysis: a weather model held to observations, not a thermometer reading. Its record starts in 1981, so ranks are among about 45 years, not a century.",
  "The latest months are the most likely to be revised."
 ],
 "method": "Each month is ranked against the same month in every year since 1981. The top tenth of that record is 'much warmer than normal', the top third 'warmer', the middle third 'near normal'.",
 "sources": [
  {
   "name": "climatedata.dev world-capitals, version 2026-10-25.06179c5d54",
   "url": "https://climatedata.dev/",
   "license": "U.S. public domain"
  },
  {
   "name": "NASA Langley Research Center POWER Project, Monthly and Annual API; capitals from Natural Earth",
   "url": "https://power.larc.nasa.gov/docs/referencing/",
   "license": "U.S. public domain"
  }
 ],
 "check": {
  "month": 9,
  "year": 2026,
  "value": 8.27,
  "normal": 7.74,
  "anomaly": 0.53,
  "rank_warm": 14,
  "n": 46,
  "verdict_words": [
   "Much warmer than normal",
   "Warmer than normal",
   "Near normal",
   "Cooler than normal",
   "Much cooler than normal"
  ],
  "capital": "Reykjavík",
  "lat": 64.1435,
  "lon": -21.9365,
  "dataset": "world-capitals",
  "version": "2026-10-25.06179c5d54"
 },
 "api": {
  "now": "/data/places/isl/climate.json",
  "source": "https://api.climatedata.dev/v1/world-capitals/tavg/isl.json",
  "source_label": "The climatedata.dev API it comes from (live, no key; every month since 1981 with its normal, anomaly and rank)"
 },
 "generated_at": "2026-10-26T20:12:11+00:00"
}