December
December · January · February
Mexico · 1991–2020
December leads for comfortable weather in Ciudad Constitución: typically 26.6°C by day, 8.1°C at night, with 14 mm of rain. Based on measured 1991–2020 NOAA station history.
December · January · February
September · October · August
December · January · February
The weakest month is August, scoring 42 against December’s 79 — days average 38°C, 14° above the 24°C the score treats as ideal.
Month by month
The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 26.7°C | 7.6°C | 13 mm | 0.8 | 10 h 44 | 78 | Good coverage |
| February | 27.8°C | 7.9°C | 10 mm | 1 | 11 h 17 | 75 | Good coverage |
| March | 29.5°C | 9°C | 2 mm | 0.2 | 11 h 56 | 71 | Good coverage |
| April | 31°C | 9.9°C | 0 mm | 0 | 12 h 43 | 68 | Good coverage |
| May | 32.3°C | 12°C | 0 mm | 0 | 13 h 21 | 67 | Good coverage |
| June | 34.9°C | 15°C | 0 mm | 0 | 13 h 41 | 64 | Good coverage |
| July | 37.8°C | 19.1°C | 6 mm | 0.6 | 13 h 33 | 47 | Good coverage |
| August | 38°C | 20.8°C | 44 mm | 2.8 | 13 h 01 | 42 | Good coverage |
| September | 36.3°C | 20.9°C | 46 mm | 3.2 | 12 h 16 | 47 | Good coverage |
| October | 33.8°C | 16.3°C | 28 mm | 1 | 11 h 32 | 65 | Good coverage |
| November | 30.3°C | 11.4°C | 10 mm | 0.8 | 10 h 54 | 73 | Good coverage |
| December | 26.6°C | 8.1°C | 14 mm | 1.2 | 10 h 35 | 79 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 35.6°C18 Jan 1959 | -2.2°C21 Jan 1988 | 57 mm3 Jan 2005 | 105 mm1992 · driest 0 mm in 1988 | 53 |
| February | 38.9°C26 Feb 2009 | -1.7°C24 Feb 1975 | 32 mm15 Feb 1995 | 40 mm2003 · driest 0 mm in 1984 | 53 |
| March | 40.0°C4 Mar 2009 | 0.0°C5 Mar 1985 | 26 mm2 Mar 1983 | 31 mm1992 · driest 0 mm in 1972 | 54 |
| April | 42.2°C13 Apr 2006 | 1.7°C1 Apr 1985 | 7 mm28 Apr 1986 | 13 mm1986 · driest 0 mm in 1967 | 55 |
| May | 45.0°C27 May 1958 | 3.9°C1 May 1999 | 8 mm20 May 1997 | 9 mm1997 · driest 0 mm in 1982 | 55 |
| June | 45.0°C13 Jun 1980 | 5.6°C12 Jun 1972 | 22 mm23 Jun 1984 | 22 mm1984 · driest 0 mm in 1980 | 55 |
| July | 45.0°C14 Jul 1997 | 10.0°C1 Jul 1987 | 90 mm21 Jul 1983 | 151 mm1983 · driest 0 mm in 1992 | 55 |
| August | 46.7°C21 Aug 2005 | 8.9°C24 Aug 1982 | 184 mm26 Aug 2003 | 217 mm2003 · driest 0 mm in 1980 | 52 |
| September | 45.6°C21 Sep 1982 | 10.0°C13 Sep 1982 | 117 mm5 Sep 1997 | 137 mm1997 · driest 0 mm in 1977 | 54 |
| October | 42.8°C15 Oct 1978 | 5.0°C8 Oct 1982 | 119 mm11 Oct 2008 | 175 mm2008 · driest 0 mm in 1973 | 55 |
| November | 38.9°C10 Nov 2003 | 1.7°C29 Nov 1978 | 59 mm24 Nov 1967 | 94 mm1967 · driest 0 mm in 1966 | 56 |
| December | 35.6°C20 Dec 1971 | -3.3°C27 Dec 1987 | 70 mm8 Dec 1959 | 141 mm1994 · driest 0 mm in 2006 | 53 |
| Month | Days 25°C+ | Days 30°C+ | Heavy rain (10 mm+) |
|---|---|---|---|
| January | 23 | 7 | <1 |
| February | 23 | 10 | <1 |
| March | 27 | 16 | <1 |
| April | 29 | 20 | 0 |
| May | 31 | 25 | 0 |
| June | 30 | 28 | 0 |
| July | 31 | 31 | <1 |
| August | 31 | 31 | 1 |
| September | 30 | 29 | 1 |
| October | 31 | 26 | <1 |
| November | 28 | 18 | <1 |
| December | 22 | 6 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 93% | 4% | 1% | 1% | 23.1–28.6°C |
| February | 95% | 3% | <1% | <1% | 24.4–29.4°C |
| March | 98% | 1% | <1% | <1% | 25.3–30.5°C |
| April | 100% | <1% | 0% | 0% | 27.6–32.1°C |
| May | 100% | <1% | 0% | 0% | 28.4–33.5°C |
| June | 100% | <1% | <1% | 0% | 31.0–36.3°C |
| July | 97% | 3% | 1% | 1% | 34.1–38.7°C |
| August | 91% | 9% | 4% | 7% | 35.3–38.7°C |
| September | 91% | 9% | 4% | 5% | 34.3–37.6°C |
| October | 97% | 3% | 2% | <1% | 31.5–35.2°C |
| November | 98% | 2% | 1% | <1% | 27.7–31.4°C |
| December | 95% | 4% | 2% | 1% | 24.3–28.6°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