September
September · June · August
83climate match
United States · 1991–2020
Best time to visit
Denison.
September leads for comfortable weather in Denison: typically 23.9°C by day, 11.2°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high23.9°C
Typical low11.2°C
Rain in September83 mm
July
July · August · June
71climate match
September
September · May · October
73climate match
The weakest month is January, scoring 5 against September’s 83 — days reach only -2.3°C, 26° below the 24°C the score treats as ideal.
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
5-2.3° / -11.9°
Feb
50.4° / -9.6°
Mar
87.7° / -3.5°
Apr
3615° / 2.4°
May
6221.1° / 9.4°
Jun
7226.7° / 15.3°
Jul
6628.6° / 17.4°
Aug
7127.4° / 16.1°
Sep
8323.9° / 11.2°
Oct
4816.6° / 4.4°
Nov
127.7° / -2.9°
Dec
50.5° / -8.6°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -2.3°C | -11.9°C | 19 mm | 4.3 | 9 h 26 | 5 | Strong coverage |
| February | 0.4°C | -9.6°C | 25 mm | 5 | 10 h 31 | 5 | Strong coverage |
| March | 7.7°C | -3.5°C | 48 mm | 6.4 | 11 h 48 | 8 | Strong coverage |
| April | 15°C | 2.4°C | 86 mm | 8.2 | 13 h 17 | 36 | Strong coverage |
| May | 21.1°C | 9.4°C | 117 mm | 10.8 | 14 h 32 | 62 | Strong coverage |
| June | 26.7°C | 15.3°C | 125 mm | 9.7 | 15 h 13 | 72 | Strong coverage |
| July | 28.6°C | 17.4°C | 105 mm | 8.2 | 14 h 57 | 66 | Strong coverage |
| August | 27.4°C | 16.1°C | 112 mm | 7.9 | 13 h 52 | 71 | Strong coverage |
| September | 23.9°C | 11.2°C | 83 mm | 6.9 | 12 h 26 | 83 | Strong coverage |
| October | 16.6°C | 4.4°C | 67 mm | 6.9 | 11 h | 48 | Strong coverage |
| November | 7.7°C | -2.9°C | 37 mm | 4.4 | 9 h 45 | 12 | Strong coverage |
| December | 0.5°C | -8.6°C | 31 mm | 4.9 | 9 h 08 | 5 | Strong coverage |
What has changed
Denison runs +0.2°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
+0.5
Feb
-1.0
Mar
+1.1
Apr
-1.3
May
-0.9
Jun
+0.6
Jul
-0.4
Aug
-0.4
Sep
+1.5
Oct
-0.4
Nov
+0.7
Dec
+1.8
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C27 Jan 2002 | -40.0°C12 Jan 1912 | 32 mm8 Jan 1937 | 70 mm1932 · driest 0 mm in 1920 | 131 |
| February | 24.4°C27 Feb 2024 | -38.3°C2 Feb 1905 | 57 mm20 Feb 1954 | 89 mm1971 · driest 0 mm in 1896 | 132 |
| March | 31.1°C29 Mar 1986 | -30.6°C5 Mar 1960 | 82 mm24 Mar 1906 | 181 mm1906 · driest 0 mm in 1948 | 132 |
| April | 35.0°C28 Apr 1910 | -15.0°C3 Apr 1936 | 86 mm7 Apr 1998 | 214 mm1964 · driest 0 mm in 1946 | 130 |
| May | 40.6°C31 May 1934 | -8.3°C2 May 1907 | 112 mm6 May 2007 | 252 mm1903 · driest 2 mm in 1948 | 131 |
| June | 42.8°C10 Jun 1933 | -0.6°C3 Jun 1969 | 135 mm8 Jun 2008 | 315 mm1967 · driest 2 mm in 1933 | 130 |
| July | 44.4°C14 Jul 1936 | 3.9°C17 Jul 1911 | 200 mm9 Jul 1993 | 305 mm1993 · driest 0 mm in 1947 | 128 |
| August | 43.9°C5 Aug 1934 | 1.1°C30 Aug 1915 | 197 mm29 Aug 1907 | 321 mm2014 · driest 0 mm in 1947 | 129 |
| September | 39.4°C6 Sep 1939 | -7.8°C29 Sep 1899 | 148 mm11 Sep 1972 | 280 mm1965 · driest 6 mm in 2009 | 128 |
| October | 33.3°C1 Oct 2023 | -18.3°C30 Oct 1925 | 112 mm12 Oct 1928 | 168 mm1928 · driest 0 mm in 1952 | 129 |
| November | 26.7°C3 Nov 2005 | -26.7°C21 Nov 1937 | 71 mm9 Nov 1977 | 207 mm1909 · driest 0 mm in 1949 | 128 |
| December | 21.1°C16 Dec 2021 | -32.2°C22 Dec 1989 | 88 mm14 Dec 2015 | 181 mm2015 · driest 0 mm in 1895 | 129 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | <1 | 4 |
| February | 0 | 0 | 27 | <1 | 5 |
| March | <1 | 0 | 23 | 2 | 2 |
| April | 3 | <1 | 10 | 3 | 1 |
| May | 9 | 2 | <1 | 4 | <1 |
| June | 21 | 8 | 0 | 4 | 0 |
| July | 27 | 12 | 0 | 3 | 0 |
| August | 24 | 8 | 0 | 4 | 0 |
| September | 14 | 4 | <1 | 3 | 0 |
| October | 4 | <1 | 8 | 2 | <1 |
| November | <1 | 0 | 21 | 1 | 2 |
| December | 0 | 0 | 29 | <1 | 4 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 12% | 1% | 6% | -6.3–3.1°C |
| February | <1% | 14% | 2% | 8% | -3.9–4.8°C |
| March | 7% | 18% | 4% | 15% | 3.0–11.8°C |
| April | 25% | 25% | 8% | 28% | 12.4–18.9°C |
| May | 49% | 30% | 12% | 37% | 19.5–24.9°C |
| June | 67% | 30% | 12% | 36% | 24.6–29.6°C |
| July | 75% | 24% | 9% | 24% | 27.2–32.1°C |
| August | 75% | 24% | 10% | 24% | 26.0–30.7°C |
| September | 64% | 23% | 9% | 23% | 21.7–26.8°C |
| October | 36% | 17% | 6% | 16% | 14.6–21.1°C |
| November | 4% | 13% | 4% | 8% | 4.7–11.5°C |
| December | 0% | 12% | 2% | 6% | -3.2–4.4°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 4853757
- NOAA station
- USC00132171 · DENISON
- Station distance
- 3 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 30 usable years
- Daylight
- Calculated from latitude 42.02°, 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.