Postville Weather Records (USC00136766)
Record envelope, standing records and threshold days for Postville (USC00136766), Iowa, United States, with 134 years of record.
Key Facts for Postville
- Postville (USC00136766) is a weather station in Iowa, United States at 43.09 latitude and -91.56 longitude, 355 m (1,165 ft) above sea level.
- The station reports from 1893 to 2026, 134 years of record.
- 1,464 records set at Postville still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Postville tied a daily record high minimum temperature of 22.2 C (72.0 F) on 31 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Iowa, United States, 43.09 latitude, -91.56 longitude.
- Elevation: 355 m (1,165 ft).
- Period of record: 1893 to 2026, 134 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
8 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 15.6 C (60.1 F) | -37.2 C (-35.0 F) | 8.9 C (48.0 F) | -30.0 C (-22.0 F) |
| Feb | 22.2 C (72.0 F) | -33.9 C (-29.0 F) | 17.2 C (63.0 F) | -17.8 C (0.0 F) |
| Mar | 28.3 C (82.9 F) | -27.8 C (-18.0 F) | 27.2 C (81.0 F) | -17.8 C (0.0 F) |
| Apr | 31.1 C (88.0 F) | -14.4 C (6.1 F) | 27.8 C (82.0 F) | -6.1 C (21.0 F) |
| May | 40.6 C (105.1 F) | -6.7 C (19.9 F) | 32.8 C (91.0 F) | -1.1 C (30.0 F) |
| Jun | 40.0 C (104.0 F) | 1.1 C (34.0 F) | 32.8 C (91.0 F) | 8.9 C (48.0 F) |
| Jul | 42.2 C (108.0 F) | 3.9 C (39.0 F) | 35.6 C (96.1 F) | 10.0 C (50.0 F) |
| Aug | 38.9 C (102.0 F) | 1.7 C (35.1 F) | 30.6 C (87.1 F) | 9.4 C (48.9 F) |
| Sep | 37.2 C (99.0 F) | -6.7 C (19.9 F) | n/a | n/a |
| Oct | 32.2 C (90.0 F) | -21.7 C (-7.1 F) | n/a | n/a |
| Nov | 24.4 C (75.9 F) | -24.4 C (-11.9 F) | n/a | n/a |
| Dec | 20.0 C (68.0 F) | -32.8 C (-27.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1897 | 1 |
| 1899 | 1 |
| 1901 | 48 |
| 1902 | 17 |
| 1903 | 16 |
| 1904 | 15 |
| 1905 | 16 |
| 1906 | 17 |
| 1907 | 15 |
| 1908 | 9 |
| 1909 | 27 |
| 1910 | 20 |
| 1911 | 34 |
| 1912 | 37 |
| 1913 | 23 |
| 1914 | 21 |
| 1915 | 26 |
| 1916 | 13 |
| 1917 | 32 |
| 1918 | 16 |
| 1919 | 16 |
| 1920 | 16 |
| 1921 | 22 |
| 1922 | 7 |
| 1923 | 18 |
| 1924 | 20 |
| 1925 | 38 |
| 1926 | 20 |
| 1927 | 20 |
| 1928 | 17 |
| 1929 | 27 |
| 1930 | 33 |
| 1931 | 28 |
| 1932 | 12 |
| 1933 | 27 |
| 1934 | 34 |
| 1935 | 22 |
| 1936 | 48 |
| 1937 | 20 |
| 1938 | 14 |
| 1939 | 25 |
| 1940 | 18 |
| 1941 | 19 |
| 1942 | 16 |
| 1943 | 15 |
| 1944 | 6 |
| 1945 | 15 |
| 1946 | 5 |
| 1987 | 1 |
| 1988 | 20 |
| 1989 | 23 |
| 1990 | 20 |
| 2001 | 2 |
| 2002 | 28 |
| 2003 | 14 |
| 2004 | 14 |
| 2005 | 13 |
| 2006 | 16 |
| 2007 | 16 |
| 2008 | 8 |
| 2009 | 12 |
| 2010 | 8 |
| 2011 | 14 |
| 2012 | 35 |
| 2013 | 16 |
| 2014 | 14 |
| 2015 | 12 |
| 2016 | 7 |
| 2017 | 19 |
| 2018 | 24 |
| 2019 | 21 |
| 2020 | 18 |
| 2021 | 21 |
| 2022 | 15 |
| 2023 | 21 |
| 2024 | 22 |
| 2025 | 16 |
| 2026 | 12 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1940-07-26 | Record daily precipitation | Record daily precipitation 156.2 mm (6.1 in) |
| 1987-12-27 | Record daily snowfall | Record daily snowfall 30.5 cm (12.0 in) |
Wettest Day of Each Month
Jul: 156.2 mm (6.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 58.2 mm (2.3 in) | 5 January 1946 |
| Feb | 44.5 mm (1.8 in) | 22 February 1922 |
| Mar | 46.5 mm (1.8 in) | 5 March 2004 |
| Apr | 79.2 mm (3.1 in) | 24 April 2008 |
| May | 138.4 mm (5.4 in) | 18 May 1902 |
| Jun | 109.2 mm (4.3 in) | 15 June 1991 |
| Jul | 156.2 mm (6.1 in) | 26 July 1940 |
| Aug | 114.8 mm (4.5 in) | 13 August 1943 |
| Sep | 116.8 mm (4.6 in) | 11 September 2006 |
| Oct | 111.5 mm (4.4 in) | 14 October 2012 |
| Nov | 70.9 mm (2.8 in) | 4 November 2003 |
| Dec | 62.5 mm (2.5 in) | 14 December 2015 |
Period of Record Coverage
1901 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1901 | 320 | 88% | No |
| 1902 | 358 | 98% | Yes |
| 1903 | 354 | 97% | Yes |
| 1904 | 325 | 89% | No |
| 1905 | 360 | 99% | Yes |
| 1906 | 356 | 98% | Yes |
| 1907 | 332 | 91% | Yes |
| 1908 | 327 | 89% | No |
| 1909 | 337 | 92% | Yes |
| 1910 | 350 | 96% | Yes |
| 1911 | 348 | 95% | Yes |
| 1912 | 332 | 91% | Yes |
| 1913 | 337 | 92% | Yes |
| 1914 | 358 | 98% | Yes |
| 1915 | 352 | 96% | Yes |
| 1916 | 357 | 98% | Yes |
| 1917 | 350 | 96% | Yes |
| 1918 | 351 | 96% | Yes |
| 1919 | 339 | 93% | Yes |
| 1920 | 356 | 97% | Yes |
| 1921 | 363 | 99% | Yes |
| 1922 | 365 | 100% | Yes |
| 1923 | 363 | 99% | Yes |
| 1924 | 364 | 99% | Yes |
| 1925 | 363 | 99% | Yes |
| 1926 | 362 | 99% | Yes |
| 1927 | 360 | 99% | Yes |
| 1928 | 338 | 92% | Yes |
| 1929 | 354 | 97% | Yes |
| 1930 | 362 | 99% | Yes |
| 1931 | 361 | 99% | Yes |
| 1932 | 362 | 99% | Yes |
| 1933 | 361 | 99% | Yes |
| 1934 | 362 | 99% | Yes |
| 1935 | 363 | 99% | Yes |
| 1936 | 364 | 99% | Yes |
| 1937 | 365 | 100% | Yes |
| 1938 | 363 | 99% | Yes |
| 1939 | 364 | 100% | Yes |
| 1940 | 365 | 100% | Yes |
| 1941 | 365 | 100% | Yes |
| 1942 | 363 | 99% | Yes |
| 1943 | 361 | 99% | Yes |
| 1944 | 305 | 83% | No |
| 1945 | 365 | 100% | Yes |
| 1946 | 88 | 24% | No |
| 1987 | 31 | 8% | No |
| 1988 | 364 | 99% | Yes |
| 1989 | 359 | 98% | Yes |
| 1990 | 362 | 99% | Yes |
| 2001 | 27 | 7% | No |
| 2002 | 359 | 98% | Yes |
| 2003 | 337 | 92% | Yes |
| 2004 | 361 | 99% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 360 | 99% | Yes |
| 2007 | 363 | 99% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 363 | 99% | Yes |
| 2010 | 355 | 97% | Yes |
| 2011 | 361 | 99% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 340 | 93% | Yes |
| 2015 | 304 | 83% | No |
| 2016 | 355 | 97% | Yes |
| 2017 | 360 | 99% | Yes |
| 2018 | 358 | 98% | Yes |
| 2019 | 353 | 97% | Yes |
| 2020 | 353 | 96% | Yes |
| 2021 | 349 | 96% | Yes |
| 2022 | 360 | 99% | Yes |
| 2023 | 330 | 90% | Yes |
| 2024 | 341 | 93% | Yes |
| 2025 | 341 | 93% | Yes |
| 2026 | 234 | 64% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 31 August 2026 | Postville, US | daily high min (Tie, Provisional) | 22.2 C (72.0 F) | tie | 80 years | 8 of 100 (Routine) |
| 28 July 2026 | Postville, US | daily high max (Tie) | 33.9 C (93.0 F) | tie | 108 years | 10 of 100 (Routine) |
| 30 June 2026 | Postville, US | monthly high min (Tie) | 25.0 C (77.0 F) | tie | 95 years | 12 of 100 (Routine) |
| 27 May 2026 | Postville, US | daily high max | 32.8 C (91.0 F) | 0.6 C (1.1 F) | 8 years | 13 of 100 (Routine) |
| 8 May 2026 | Postville, US | daily low min (Tie) | -1.1 C (30.0 F) | tie | 108 years | 10 of 100 (Routine) |
| 15 April 2026 | Postville, US | daily high min | 12.8 C (55.0 F) | 1.1 C (2.0 F) | 88 years | 38 of 100 (Notable) |
| 4 April 2026 | Postville, US | daily rain | 54.6 mm (2.1 in) | 31.7 mm (1.2 in) | 27 years | 49 of 100 (Notable) |
| 2 April 2026 | Postville, US | daily rain | 27.4 mm (1.1 in) | 5.0 mm (0.20 in) | 37 years | 25 of 100 (Routine) |
| 31 March 2026 | Postville, US | daily high max | 26.1 C (79.0 F) | 3.3 C (5.9 F) | 105 years | 44 of 100 (Notable) |
| 31 March 2026 | Postville, US | daily high min (Tie) | 7.8 C (46.0 F) | tie | 105 years | 10 of 100 (Routine) |
| 22 March 2026 | Postville, US | daily high max | 27.2 C (81.0 F) | 3.3 C (5.9 F) | 13 years | 18 of 100 (Routine) |
| 18 March 2026 | Postville, US | daily low max (Tie) | -5.0 C (23.0 F) | tie | 36 years | 5 of 100 (Routine) |
| 10 March 2026 | Postville, US | daily high max | 20.0 C (68.0 F) | 2.2 C (4.0 F) | 4 years | 14 of 100 (Routine) |
| 7 March 2026 | Postville, US | daily high min | 1.7 C (35.1 F) | 0.6 C (1.1 F) | 124 years | 40 of 100 (Notable) |
| 7 March 2026 | Postville, US | daily rain | 35.6 mm (1.4 in) | 21.6 mm (0.9 in) | 8 years | 39 of 100 (Notable) |
| 6 March 2026 | Postville, US | daily high min | 2.2 C (36.0 F) | 1.1 C (2.0 F) | 8 years | 13 of 100 (Routine) |
| 18 February 2026 | Postville, US | daily high min | 3.3 C (37.9 F) | 2.7 C (4.9 F) | 119 years | 43 of 100 (Notable) |
| 17 February 2026 | Postville, US | daily high max | 17.2 C (63.0 F) | 10.0 C (18.0 F) | 119 years | 55 of 100 (Notable) |
| 17 February 2026 | Postville, US | daily high min | 2.2 C (36.0 F) | 2.2 C (4.0 F) | 115 years | 42 of 100 (Notable) |
| 16 February 2026 | Postville, US | daily high min (Tie) | 0.0 C (32.0 F) | tie | 115 years | 10 of 100 (Routine) |
Climate Trend
59 complete years, 1902 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1902 | 7.4 C | -0.27 C |
| 1903 | 7.0 C | -0.72 C |
| 1905 | 7.1 C | -0.63 C |
| 1906 | 7.8 C | +0.12 C |
| 1908 | 8.3 C | +0.59 C |
| 1910 | 7.6 C | -0.16 C |
| 1913 | 8.4 C | +0.71 C |
| 1914 | 7.9 C | +0.21 C |
| 1915 | 7.2 C | -0.48 C |
| 1916 | 6.5 C | -1.17 C |
| 1917 | 5.1 C | -2.66 C |
| 1918 | 7.4 C | -0.36 C |
| 1920 | 7.1 C | -0.63 C |
| 1921 | 9.2 C | +1.53 C |
| 1922 | 8.0 C | +0.26 C |
| 1923 | 7.5 C | -0.26 C |
| 1924 | 5.7 C | -1.97 C |
| 1925 | 7.0 C | -0.74 C |
| 1926 | 6.2 C | -1.56 C |
| 1929 | 5.6 C | -2.09 C |
| 1930 | 7.5 C | -0.18 C |
| 1931 | 9.6 C | +1.85 C |
| 1932 | 6.8 C | -0.89 C |
| 1933 | 8.3 C | +0.55 C |
| 1934 | 8.6 C | +0.87 C |
| 1935 | 7.1 C | -0.63 C |
| 1936 | 7.2 C | -0.55 C |
| 1937 | 7.0 C | -0.76 C |
| 1938 | 8.7 C | +1.02 C |
| 1939 | 8.9 C | +1.20 C |
| 1940 | 7.2 C | -0.48 C |
| 1941 | 9.0 C | +1.32 C |
| 1942 | 7.7 C | +0.03 C |
| 1943 | 6.9 C | -0.83 C |
| 1945 | 7.4 C | -0.33 C |
| 1988 | 7.2 C | -0.51 C |
| 1989 | 6.2 C | -1.55 C |
| 1990 | 7.8 C | +0.13 C |
| 2002 | 6.9 C | -0.82 C |
| 2004 | 7.9 C | +0.18 C |
| 2005 | 8.4 C | +0.67 C |
| 2006 | 9.0 C | +1.32 C |
| 2007 | 8.1 C | +0.39 C |
| 2008 | 6.7 C | -1.05 C |
| 2009 | 6.8 C | -0.89 C |
| 2010 | 7.9 C | +0.19 C |
| 2011 | 7.9 C | +0.22 C |
| 2012 | 10.1 C | +2.37 C |
| 2013 | 6.8 C | -0.88 C |
| 2016 | 8.9 C | +1.18 C |
| 2017 | 8.4 C | +0.72 C |
| 2018 | 7.4 C | -0.28 C |
| 2019 | 7.2 C | -0.49 C |
| 2020 | 8.5 C | +0.76 C |
| 2021 | 9.2 C | +1.45 C |
| 2022 | 7.4 C | -0.30 C |
| 2023 | 9.7 C | +1.95 C |
| 2024 | 10.1 C | +2.34 C |
| 2025 | 8.7 C | +0.98 C |
The annual mean temperature here has risen by 0.08 C (0.02 to 0.14) per decade over 1902 to 2025. In Fahrenheit: 0.14 F (0.03 to 0.25) per decade. The slope is a straight line fitted to 59 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.08 C (0.02 to 0.14) per decade | 0.14 F (0.03 to 0.25) per decade | 1902 to 2025 | 59 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.4) per decade | 1902 to 2025 | 59 | Rise |
| Mean daily minimum | 0.02 C (-0.05 to 0.09) per decade | 0.03 F (-0.09 to 0.16) per decade | 1902 to 2025 | 59 | Not clearly different from zero |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1893 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.2 C (108.0 F) | 1901 | 33.9 C (93.0 F) | 76 |
| Coldest night (TNn) | -37.2 C (-35.0 F) | 1912 | -28.9 C (-20.0 F) | 79 |
| Wettest day (Rx1day) | 156.2 mm (6.1 in) | 1940 | 59.2 mm (2.3 in) | 94 |
| Wettest five days (Rx5day) | 228.9 mm (9.0 in) | 1902 | 90.6 mm (3.6 in) | 94 |
| Longest dry spell (CDD) | 43 days | 1942 | 21 days | 94 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1893 | n/a |
| 1894 | n/a |
| 1895 | n/a |
| 1896 | n/a |
| 1897 | n/a |
| 1898 | n/a |
| 1899 | n/a |
| 1900 | n/a |
| 1901 | 42.2 C (108.0 F) |
| 1902 | 32.2 C (90.0 F) |
| 1903 | 30.6 C (87.1 F) |
| 1904 | 33.3 C (91.9 F) |
| 1905 | 33.3 C (91.9 F) |
| 1906 | 32.8 C (91.0 F) |
| 1907 | 31.7 C (89.1 F) |
| 1908 | 33.3 C (91.9 F) |
| 1909 | 32.8 C (91.0 F) |
| 1910 | 33.3 C (91.9 F) |
| 1911 | 35.0 C (95.0 F) |
| 1912 | 32.2 C (90.0 F) |
| 1913 | 35.0 C (95.0 F) |
| 1914 | 32.8 C (91.0 F) |
| 1915 | 29.4 C (84.9 F) |
| 1916 | 34.4 C (93.9 F) |
| 1917 | 35.0 C (95.0 F) |
| 1918 | 33.3 C (91.9 F) |
| 1919 | 33.3 C (91.9 F) |
| 1920 | 31.7 C (89.1 F) |
| 1921 | 33.9 C (93.0 F) |
| 1922 | 33.9 C (93.0 F) |
| 1923 | 33.9 C (93.0 F) |
| 1924 | 31.1 C (88.0 F) |
| 1925 | 33.9 C (93.0 F) |
| 1926 | 36.1 C (97.0 F) |
| 1927 | 34.4 C (93.9 F) |
| 1928 | 31.7 C (89.1 F) |
| 1929 | 32.2 C (90.0 F) |
| 1930 | 35.0 C (95.0 F) |
| 1931 | 37.2 C (99.0 F) |
| 1932 | 33.3 C (91.9 F) |
| 1933 | 35.6 C (96.1 F) |
| 1934 | 40.6 C (105.1 F) |
| 1935 | 33.9 C (93.0 F) |
| 1936 | 41.1 C (106.0 F) |
| 1937 | 37.8 C (100.0 F) |
| 1938 | 32.2 C (90.0 F) |
| 1939 | 37.2 C (99.0 F) |
| 1940 | 35.6 C (96.1 F) |
| 1941 | 34.4 C (93.9 F) |
| 1942 | 33.3 C (91.9 F) |
| 1943 | 33.3 C (91.9 F) |
| 1944 | 34.4 C (93.9 F) |
| 1945 | 34.4 C (93.9 F) |
| 1946 | 24.4 C (75.9 F) |
| 1987 | 8.3 C (46.9 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 36.1 C (97.0 F) |
| 1990 | 35.6 C (96.1 F) |
| 1991 | n/a |
| 1992 | n/a |
| 1993 | n/a |
| 1994 | n/a |
| 1995 | n/a |
| 1996 | n/a |
| 1997 | n/a |
| 1998 | n/a |
| 1999 | n/a |
| 2000 | n/a |
| 2001 | 17.2 C (63.0 F) |
| 2002 | 34.4 C (93.9 F) |
| 2003 | 35.6 C (96.1 F) |
| 2004 | 31.7 C (89.1 F) |
| 2005 | 33.9 C (93.0 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 34.4 C (93.9 F) |
| 2008 | 31.7 C (89.1 F) |
| 2009 | 34.4 C (93.9 F) |
| 2010 | 33.3 C (91.9 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 37.8 C (100.0 F) |
| 2013 | 35.0 C (95.0 F) |
| 2014 | 32.2 C (90.0 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 33.9 C (93.0 F) |
| 2017 | 33.9 C (93.0 F) |
| 2018 | 33.9 C (93.0 F) |
| 2019 | 33.9 C (93.0 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 38.3 C (100.9 F) |
| 2022 | 36.1 C (97.0 F) |
| 2023 | 38.9 C (102.0 F) |
| 2024 | 35.6 C (96.1 F) |
| 2025 | 35.0 C (95.0 F) |
| 2026 | 35.6 C (96.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1893 | n/a |
| 1894 | n/a |
| 1895 | n/a |
| 1896 | n/a |
| 1897 | 1.1 C (34.0 F) |
| 1898 | n/a |
| 1899 | -3.3 C (26.1 F) |
| 1900 | 0.0 C (32.0 F) |
| 1901 | -31.7 C (-25.1 F) |
| 1902 | -31.7 C (-25.1 F) |
| 1903 | -29.4 C (-20.9 F) |
| 1904 | -33.9 C (-29.0 F) |
| 1905 | -33.9 C (-29.0 F) |
| 1906 | -26.1 C (-15.0 F) |
| 1907 | -27.2 C (-17.0 F) |
| 1908 | -25.6 C (-14.1 F) |
| 1909 | -27.2 C (-17.0 F) |
| 1910 | -31.7 C (-25.1 F) |
| 1911 | -31.7 C (-25.1 F) |
| 1912 | -37.2 C (-35.0 F) |
| 1913 | -27.8 C (-18.0 F) |
| 1914 | -30.6 C (-23.1 F) |
| 1915 | -33.3 C (-27.9 F) |
| 1916 | -33.9 C (-29.0 F) |
| 1917 | -32.8 C (-27.0 F) |
| 1918 | -33.9 C (-29.0 F) |
| 1919 | -30.6 C (-23.1 F) |
| 1920 | -29.4 C (-20.9 F) |
| 1921 | -24.4 C (-11.9 F) |
| 1922 | -29.4 C (-20.9 F) |
| 1923 | -30.6 C (-23.1 F) |
| 1924 | -35.0 C (-31.0 F) |
| 1925 | -28.9 C (-20.0 F) |
| 1926 | -30.0 C (-22.0 F) |
| 1927 | -25.0 C (-13.0 F) |
| 1928 | -26.1 C (-15.0 F) |
| 1929 | -33.9 C (-29.0 F) |
| 1930 | -31.7 C (-25.1 F) |
| 1931 | -22.2 C (-8.0 F) |
| 1932 | -27.8 C (-18.0 F) |
| 1933 | -32.8 C (-27.0 F) |
| 1934 | -26.1 C (-15.0 F) |
| 1935 | -31.7 C (-25.1 F) |
| 1936 | -34.4 C (-29.9 F) |
| 1937 | -27.2 C (-17.0 F) |
| 1938 | -25.6 C (-14.1 F) |
| 1939 | -24.4 C (-11.9 F) |
| 1940 | -29.4 C (-20.9 F) |
| 1941 | -27.8 C (-18.0 F) |
| 1942 | -32.2 C (-26.0 F) |
| 1943 | -30.6 C (-23.1 F) |
| 1944 | -25.6 C (-14.1 F) |
| 1945 | -27.8 C (-18.0 F) |
| 1946 | -27.8 C (-18.0 F) |
| 1987 | -26.7 C (-16.1 F) |
| 1988 | -32.2 C (-26.0 F) |
| 1989 | -32.8 C (-27.0 F) |
| 1990 | -32.2 C (-26.0 F) |
| 1991 | n/a |
| 1992 | n/a |
| 1993 | n/a |
| 1994 | n/a |
| 1995 | n/a |
| 1996 | n/a |
| 1997 | n/a |
| 1998 | n/a |
| 1999 | n/a |
| 2000 | n/a |
| 2001 | -21.7 C (-7.1 F) |
| 2002 | -27.2 C (-17.0 F) |
| 2003 | -24.4 C (-11.9 F) |
| 2004 | -28.3 C (-18.9 F) |
| 2005 | -27.2 C (-17.0 F) |
| 2006 | -28.9 C (-20.0 F) |
| 2007 | -29.4 C (-20.9 F) |
| 2008 | -28.3 C (-18.9 F) |
| 2009 | -32.2 C (-26.0 F) |
| 2010 | -27.8 C (-18.0 F) |
| 2011 | -30.6 C (-23.1 F) |
| 2012 | -23.9 C (-11.0 F) |
| 2013 | -27.8 C (-18.0 F) |
| 2014 | -31.7 C (-25.1 F) |
| 2015 | -27.2 C (-17.0 F) |
| 2016 | -30.0 C (-22.0 F) |
| 2017 | -25.6 C (-14.1 F) |
| 2018 | -28.9 C (-20.0 F) |
| 2019 | -33.3 C (-27.9 F) |
| 2020 | -27.8 C (-18.0 F) |
| 2021 | -31.7 C (-25.1 F) |
| 2022 | -28.9 C (-20.0 F) |
| 2023 | -27.2 C (-17.0 F) |
| 2024 | -26.7 C (-16.1 F) |
| 2025 | -28.3 C (-18.9 F) |
| 2026 | -30.0 C (-22.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1893 | 44.7 mm (1.8 in) |
| 1894 | 44.7 mm (1.8 in) |
| 1895 | 30.5 mm (1.2 in) |
| 1896 | 81.3 mm (3.2 in) |
| 1897 | 79.2 mm (3.1 in) |
| 1898 | 62.2 mm (2.4 in) |
| 1899 | 94.0 mm (3.7 in) |
| 1900 | 55.9 mm (2.2 in) |
| 1901 | 40.9 mm (1.6 in) |
| 1902 | 138.4 mm (5.4 in) |
| 1903 | 102.6 mm (4.0 in) |
| 1904 | 69.6 mm (2.7 in) |
| 1905 | 67.3 mm (2.6 in) |
| 1906 | 42.7 mm (1.7 in) |
| 1907 | 48.3 mm (1.9 in) |
| 1908 | 150.6 mm (5.9 in) |
| 1909 | 43.2 mm (1.7 in) |
| 1910 | 53.8 mm (2.1 in) |
| 1911 | 47.0 mm (1.9 in) |
| 1912 | 51.3 mm (2.0 in) |
| 1913 | 43.7 mm (1.7 in) |
| 1914 | 57.7 mm (2.3 in) |
| 1915 | 33.0 mm (1.3 in) |
| 1916 | 58.9 mm (2.3 in) |
| 1917 | 44.5 mm (1.8 in) |
| 1918 | 78.7 mm (3.1 in) |
| 1919 | 41.9 mm (1.6 in) |
| 1920 | 56.4 mm (2.2 in) |
| 1921 | 63.5 mm (2.5 in) |
| 1922 | 44.5 mm (1.8 in) |
| 1923 | 41.7 mm (1.6 in) |
| 1924 | 45.2 mm (1.8 in) |
| 1925 | 81.3 mm (3.2 in) |
| 1926 | 50.5 mm (2.0 in) |
| 1927 | 59.4 mm (2.3 in) |
| 1928 | 75.4 mm (3.0 in) |
| 1929 | 41.1 mm (1.6 in) |
| 1930 | 56.9 mm (2.2 in) |
| 1931 | 69.9 mm (2.8 in) |
| 1932 | 63.2 mm (2.5 in) |
| 1933 | 58.4 mm (2.3 in) |
| 1934 | 44.7 mm (1.8 in) |
| 1935 | 56.1 mm (2.2 in) |
| 1936 | 64.3 mm (2.5 in) |
| 1937 | 53.3 mm (2.1 in) |
| 1938 | 78.0 mm (3.1 in) |
| 1939 | 43.2 mm (1.7 in) |
| 1940 | 156.2 mm (6.1 in) |
| 1941 | 83.3 mm (3.3 in) |
| 1942 | 49.3 mm (1.9 in) |
| 1943 | 114.8 mm (4.5 in) |
| 1944 | 76.7 mm (3.0 in) |
| 1945 | 71.9 mm (2.8 in) |
| 1946 | 58.2 mm (2.3 in) |
| 1987 | 16.0 mm (0.6 in) |
| 1988 | 52.3 mm (2.1 in) |
| 1989 | 48.0 mm (1.9 in) |
| 1990 | 69.3 mm (2.7 in) |
| 1991 | 109.2 mm (4.3 in) |
| 1992 | 56.6 mm (2.2 in) |
| 1993 | 66.5 mm (2.6 in) |
| 1994 | 74.2 mm (2.9 in) |
| 1995 | 58.9 mm (2.3 in) |
| 1996 | 57.7 mm (2.3 in) |
| 1997 | 71.1 mm (2.8 in) |
| 1998 | 62.7 mm (2.5 in) |
| 1999 | 77.5 mm (3.1 in) |
| 2000 | 25.4 mm (1.0 in) |
| 2001 | 8.4 mm (0.33 in) |
| 2002 | 67.6 mm (2.7 in) |
| 2003 | 70.9 mm (2.8 in) |
| 2004 | 110.0 mm (4.3 in) |
| 2005 | 50.0 mm (2.0 in) |
| 2006 | 116.8 mm (4.6 in) |
| 2007 | 89.7 mm (3.5 in) |
| 2008 | 88.9 mm (3.5 in) |
| 2009 | 77.7 mm (3.1 in) |
| 2010 | 49.8 mm (2.0 in) |
| 2011 | 82.5 mm (3.2 in) |
| 2012 | 111.5 mm (4.4 in) |
| 2013 | 56.6 mm (2.2 in) |
| 2014 | 94.5 mm (3.7 in) |
| 2015 | 62.5 mm (2.5 in) |
| 2016 | 88.4 mm (3.5 in) |
| 2017 | 64.5 mm (2.5 in) |
| 2018 | 67.8 mm (2.7 in) |
| 2019 | 56.4 mm (2.2 in) |
| 2020 | 65.3 mm (2.6 in) |
| 2021 | 95.5 mm (3.8 in) |
| 2022 | 90.2 mm (3.6 in) |
| 2023 | 45.2 mm (1.8 in) |
| 2024 | 45.2 mm (1.8 in) |
| 2025 | 47.0 mm (1.9 in) |
| 2026 | 54.6 mm (2.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1893 | 61.4 mm (2.4 in) |
| 1894 | 59.7 mm (2.4 in) |
| 1895 | 42.4 mm (1.7 in) |
| 1896 | 69.6 mm (2.7 in) |
| 1897 | 51.6 mm (2.0 in) |
| 1898 | 73.1 mm (2.9 in) |
| 1899 | 98.3 mm (3.9 in) |
| 1900 | 66.6 mm (2.6 in) |
| 1901 | 79.6 mm (3.1 in) |
| 1902 | 228.9 mm (9.0 in) |
| 1903 | 134.4 mm (5.3 in) |
| 1904 | 57.6 mm (2.3 in) |
| 1905 | 116.8 mm (4.6 in) |
| 1906 | 69.9 mm (2.8 in) |
| 1907 | 42.2 mm (1.7 in) |
| 1908 | 84.1 mm (3.3 in) |
| 1909 | 73.4 mm (2.9 in) |
| 1910 | 64.5 mm (2.5 in) |
| 1911 | 85.2 mm (3.4 in) |
| 1912 | 38.2 mm (1.5 in) |
| 1913 | 54.1 mm (2.1 in) |
| 1914 | 96.3 mm (3.8 in) |
| 1915 | 77.0 mm (3.0 in) |
| 1916 | 117.3 mm (4.6 in) |
| 1917 | 64.7 mm (2.5 in) |
| 1918 | 133.3 mm (5.2 in) |
| 1919 | 80.7 mm (3.2 in) |
| 1920 | 96.8 mm (3.8 in) |
| 1921 | 84.0 mm (3.3 in) |
| 1922 | 80.8 mm (3.2 in) |
| 1923 | 76.7 mm (3.0 in) |
| 1924 | 71.1 mm (2.8 in) |
| 1925 | 112.7 mm (4.4 in) |
| 1926 | 89.9 mm (3.5 in) |
| 1927 | 82.6 mm (3.3 in) |
| 1928 | 96.1 mm (3.8 in) |
| 1929 | 50.0 mm (2.0 in) |
| 1930 | 78.0 mm (3.1 in) |
| 1931 | 100.8 mm (4.0 in) |
| 1932 | 118.3 mm (4.7 in) |
| 1933 | 71.1 mm (2.8 in) |
| 1934 | 56.4 mm (2.2 in) |
| 1935 | 72.0 mm (2.8 in) |
| 1936 | 104.9 mm (4.1 in) |
| 1937 | 87.6 mm (3.4 in) |
| 1938 | 134.9 mm (5.3 in) |
| 1939 | 72.6 mm (2.9 in) |
| 1940 | 171.7 mm (6.8 in) |
| 1941 | 172.7 mm (6.8 in) |
| 1942 | 72.4 mm (2.9 in) |
| 1943 | 167.6 mm (6.6 in) |
| 1944 | 123.2 mm (4.9 in) |
| 1945 | 84.4 mm (3.3 in) |
| 1946 | 58.2 mm (2.3 in) |
| 1987 | 24.6 mm (1.0 in) |
| 1988 | 136.1 mm (5.4 in) |
| 1989 | 58.5 mm (2.3 in) |
| 1990 | 99.0 mm (3.9 in) |
| 1991 | 124.5 mm (4.9 in) |
| 1992 | 94.4 mm (3.7 in) |
| 1993 | 105.4 mm (4.1 in) |
| 1994 | 82.6 mm (3.3 in) |
| 1995 | 80.7 mm (3.2 in) |
| 1996 | 90.7 mm (3.6 in) |
| 1997 | 123.9 mm (4.9 in) |
| 1998 | 104.4 mm (4.1 in) |
| 1999 | 149.1 mm (5.9 in) |
| 2000 | 27.9 mm (1.1 in) |
| 2001 | 8.4 mm (0.33 in) |
| 2002 | 104.6 mm (4.1 in) |
| 2003 | 85.7 mm (3.4 in) |
| 2004 | 170.9 mm (6.7 in) |
| 2005 | 81.6 mm (3.2 in) |
| 2006 | 120.2 mm (4.7 in) |
| 2007 | 158.8 mm (6.3 in) |
| 2008 | 142.0 mm (5.6 in) |
| 2009 | 130.3 mm (5.1 in) |
| 2010 | 127.3 mm (5.0 in) |
| 2011 | 90.4 mm (3.6 in) |
| 2012 | 133.1 mm (5.2 in) |
| 2013 | 137.1 mm (5.4 in) |
| 2014 | 170.7 mm (6.7 in) |
| 2015 | 123.9 mm (4.9 in) |
| 2016 | 123.6 mm (4.9 in) |
| 2017 | 104.4 mm (4.1 in) |
| 2018 | 142.6 mm (5.6 in) |
| 2019 | 114.5 mm (4.5 in) |
| 2020 | 105.7 mm (4.2 in) |
| 2021 | 152.4 mm (6.0 in) |
| 2022 | 124.5 mm (4.9 in) |
| 2023 | 75.7 mm (3.0 in) |
| 2024 | 112.8 mm (4.4 in) |
| 2025 | 88.9 mm (3.5 in) |
| 2026 | 104.4 mm (4.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1893 | 27 days |
| 1894 | 23 days |
| 1895 | 16 days |
| 1896 | 14 days |
| 1897 | 10 days |
| 1898 | 14 days |
| 1899 | 20 days |
| 1900 | 17 days |
| 1901 | 20 days |
| 1902 | 15 days |
| 1903 | 26 days |
| 1904 | 21 days |
| 1905 | 17 days |
| 1906 | 21 days |
| 1907 | 16 days |
| 1908 | 30 days |
| 1909 | 21 days |
| 1910 | 36 days |
| 1911 | 18 days |
| 1912 | 18 days |
| 1913 | 21 days |
| 1914 | 19 days |
| 1915 | 13 days |
| 1916 | 19 days |
| 1917 | 20 days |
| 1918 | 22 days |
| 1919 | 27 days |
| 1920 | 18 days |
| 1921 | 14 days |
| 1922 | 17 days |
| 1923 | 18 days |
| 1924 | 22 days |
| 1925 | 27 days |
| 1926 | 18 days |
| 1927 | 19 days |
| 1928 | 23 days |
| 1929 | 19 days |
| 1930 | 18 days |
| 1931 | 20 days |
| 1932 | 21 days |
| 1933 | 26 days |
| 1934 | 19 days |
| 1935 | 25 days |
| 1936 | 31 days |
| 1937 | 25 days |
| 1938 | 19 days |
| 1939 | 20 days |
| 1940 | 16 days |
| 1941 | 21 days |
| 1942 | 43 days |
| 1943 | 27 days |
| 1944 | 28 days |
| 1945 | 23 days |
| 1946 | 14 days |
| 1987 | 5 days |
| 1988 | 40 days |
| 1989 | 17 days |
| 1990 | 24 days |
| 1991 | 32 days |
| 1992 | 24 days |
| 1993 | 22 days |
| 1994 | 26 days |
| 1995 | 24 days |
| 1996 | 30 days |
| 1997 | 17 days |
| 1998 | 20 days |
| 1999 | 23 days |
| 2000 | 15 days |
| 2001 | 15 days |
| 2002 | 31 days |
| 2003 | 24 days |
| 2004 | 18 days |
| 2005 | 17 days |
| 2006 | 25 days |
| 2007 | 32 days |
| 2008 | 17 days |
| 2009 | 37 days |
| 2010 | 21 days |
| 2011 | 18 days |
| 2012 | 22 days |
| 2013 | 18 days |
| 2014 | 13 days |
| 2015 | 24 days |
| 2016 | 26 days |
| 2017 | 20 days |
| 2018 | 24 days |
| 2019 | 26 days |
| 2020 | 21 days |
| 2021 | 20 days |
| 2022 | 31 days |
| 2023 | 33 days |
| 2024 | 25 days |
| 2025 | 43 days |
| 2026 | 14 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
59 years with a frostAcross 59 years with a frost, the median last spring frost at Postville falls on 3 May and the median first autumn frost on 3 October, which leaves a median of 153 days between them.
Fitted over all years, the growing season changes by +0.4 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1939 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 3 May | n/a | 3 May | n/a | -0.3 days per decade |
| First autumn frost | 3 October | n/a | 3 October | n/a | +0.2 days per decade |
| Growing days | 153 days | n/a | 158 days | n/a | +0.4 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
60 years, 1895 to 2025A day with at least 64.9 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 150.9 mm (5.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 64.9 mm (2.6 in) | |
| 5 years | 85.0 mm (3.3 in) | |
| 10 years | 99.4 mm (3.9 in) | |
| 25 years | 119.0 mm (4.7 in) | |
| 50 years | 134.5 mm (5.3 in) | |
| 100 years | 150.9 mm (5.9 in) | Longer than the 60 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 60 years of values from 1895 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 156.2 mm (6.1 in) in 1940; 116.8 mm (4.6 in) in 2006; 114.8 mm (4.5 in) in 1943.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Postville, at 1916 and 1933. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1916 ran 0.4 C (0.8 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1933 ran 0.3 C (0.5 F) higher than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1916 | -0.4 | -0.8 | possible | 5 |
| 1933 | +0.3 | +0.5 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).