September
September · August · June
83climate match
United States · 1991–2020
Best time to visit
Merna.
September leads for comfortable weather in Merna: typically 24.6°C by day, 8.7°C at night, with 53 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.6°C
Typical low8.7°C
Rain in September53 mm
August
August · July · June
72climate match
September
September · October · May
79climate match
The weakest month is January, scoring 5 against September’s 83 — days reach only 2.6°C, 21° below the 24°C the score treats as ideal, and nights drop to -11.2°C.
Month by month
The whole year,
without the guesswork.
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
Jan
52.6° / -11.2°
Feb
54° / -10°
Mar
1810.2° / -5°
Apr
3615.2° / 0°
May
5720.6° / 6.4°
Jun
7326.5° / 12.8°
Jul
7029.6° / 15.6°
Aug
7728.6° / 14.2°
Sep
8324.6° / 8.7°
Oct
4917.2° / 1°
Nov
159.6° / -5.8°
Dec
53.4° / -10.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 2.6°C | -11.2°C | 8 mm | 2.2 | 9 h 29 | 5 | Strong coverage |
| February | 4°C | -10°C | 12 mm | 3 | 10 h 32 | 5 | Strong coverage |
| March | 10.2°C | -5°C | 34 mm | 4.1 | 11 h 48 | 18 | Strong coverage |
| April | 15.2°C | 0°C | 63 mm | 7.2 | 13 h 16 | 36 | Strong coverage |
| May | 20.6°C | 6.4°C | 109 mm | 9.6 | 14 h 29 | 57 | Strong coverage |
| June | 26.5°C | 12.8°C | 97 mm | 9.3 | 15 h 10 | 73 | Strong coverage |
| July | 29.6°C | 15.6°C | 79 mm | 7.5 | 14 h 54 | 70 | Strong coverage |
| August | 28.6°C | 14.2°C | 65 mm | 5.8 | 13 h 50 | 77 | Strong coverage |
| September | 24.6°C | 8.7°C | 53 mm | 4.4 | 12 h 25 | 83 | Strong coverage |
| October | 17.2°C | 1°C | 45 mm | 5.3 | 11 h 01 | 49 | Strong coverage |
| November | 9.6°C | -5.8°C | 21 mm | 3.2 | 9 h 47 | 15 | Strong coverage |
| December | 3.4°C | -10.3°C | 13 mm | 2.4 | 9 h 11 | 5 | Strong coverage |
What has changed
Merna runs -0.3°C
on the 1961–1990 baseline.
Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.
Jan
0.0
Feb
-2.1
Mar
+1.1
Apr
-1.6
May
-1.7
Jun
+0.1
Jul
-1.0
Aug
-0.6
Sep
+1.4
Oct
-1.2
Nov
+1.0
Dec
+1.4
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 25.6°C30 Jan 1896 | -41.1°C23 Jan 1915 | 37 mm27 Jan 1944 | 57 mm2023 · driest 0 mm in 1986 | 130 |
| February | 26.1°C22 Feb 1982 | -40.6°C13 Feb 1905 | 30 mm19 Feb 1971 | 55 mm1919 · driest 0 mm in 1979 | 127 |
| March | 34.4°C22 Mar 2026 | -30.0°C11 Mar 1948 | 67 mm14 Mar 2021 | 148 mm1987 · driest 0 mm in 1955 | 128 |
| April | 37.2°C28 Apr 1910 | -20.6°C3 Apr 1936 | 95 mm20 Apr 1905 | 238 mm1906 · driest 4 mm in 2023 | 131 |
| May | 43.3°C8 May 1895 | -9.4°C3 May 1954 | 109 mm27 May 1945 | 271 mm2007 · driest 4 mm in 1901 | 131 |
| June | 41.7°C15 Jun 1946 | -1.1°C4 Jun 1950 | 104 mm9 Jun 1974 | 262 mm1975 · driest 16 mm in 2012 | 130 |
| July | 46.7°C11 Jul 1954 | 2.8°C30 Jul 1971 | 84 mm26 Jul 1905 | 230 mm1993 · driest 6 mm in 2002 | 131 |
| August | 45.0°C17 Aug 1936 | 0.6°C20 Aug 1950 | 120 mm10 Aug 1968 | 251 mm1910 · driest 0 mm in 1896 | 131 |
| September | 41.1°C20 Sep 1895 | -8.9°C29 Sep 1984 | 104 mm2 Sep 1942 | 194 mm1941 · driest 0 mm in 1953 | 131 |
| October | 36.7°C12 Oct 2015 | -18.3°C28 Oct 1925 | 107 mm13 Oct 2023 | 189 mm1946 · driest 0 mm in 1933 | 131 |
| November | 28.9°C3 Nov 2005 | -30.6°C28 Nov 1976 | 48 mm1 Nov 2000 | 80 mm1928 · driest 0 mm in 1914 | 130 |
| December | 25.0°C6 Dec 1939 | -34.4°C31 Dec 1967 | 61 mm5 Dec 1913 | 135 mm1913 · driest 0 mm in 1995 | 131 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 3 |
| February | 0 | 0 | 27 | <1 | 3 |
| March | 1 | <1 | 26 | 1 | 2 |
| April | 3 | <1 | 15 | 2 | <1 |
| May | 9 | 2 | 4 | 3 | 0 |
| June | 20 | 8 | 0 | 3 | 0 |
| July | 27 | 15 | 0 | 3 | 0 |
| August | 25 | 13 | 0 | 2 | 0 |
| September | 16 | 7 | 2 | 2 | 0 |
| October | 5 | 1 | 14 | 1 | <1 |
| November | <1 | 0 | 27 | <1 | 1 |
| December | 0 | 0 | 31 | <1 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 8% | <1% | 3% | -2.4–7.0°C |
| February | 2% | 11% | <1% | 6% | -1.0–9.1°C |
| March | 12% | 14% | 3% | 9% | 4.9–14.4°C |
| April | 31% | 22% | 7% | 24% | 13.1–19.6°C |
| May | 51% | 28% | 10% | 34% | 19.2–24.6°C |
| June | 68% | 29% | 11% | 33% | 24.5–30.3°C |
| July | 77% | 23% | 9% | 22% | 28.6–33.7°C |
| August | 79% | 20% | 7% | 17% | 27.7–32.3°C |
| September | 72% | 17% | 6% | 14% | 22.1–28.2°C |
| October | 45% | 13% | 4% | 8% | 15.4–21.9°C |
| November | 11% | 9% | 2% | 5% | 6.6–13.6°C |
| December | <1% | 8% | 1% | 3% | -0.2–7.3°C |
A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.
The evidence behind this page
Nearby, measured,
and named.
- Place identity
- GeoNames 5072968
- NOAA station
- USC00251200 · BROKEN BOW 2 W
- Station distance
- 11 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 41.48°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.