September
September · June · May
84climate match
United States · 1991–2020
Best time to visit
Mormon Crossing.
September leads for comfortable weather in Mormon Crossing: typically 24.8°C by day, 8.3°C at night, with 35 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortSeptember
Typical high24.8°C
Typical low8.3°C
Rain in September35 mm
July
July · June · August
64climate match
October
October · May · September
85climate match
The weakest month is January, scoring 8 against September’s 84 — days reach only 8.1°C, 16° below the 24°C the score treats as ideal, and nights drop to -7.1°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
88.1° / -7.1°
Feb
1810.3° / -5.2°
Mar
3514° / -2.8°
Apr
5218° / -0.5°
May
7422.4° / 3.6°
Jun
7627.9° / 8.6°
Jul
7028.6° / 12.9°
Aug
7327.2° / 12.3°
Sep
8424.8° / 8.3°
Oct
6219.7° / 1.8°
Nov
3113.2° / -3.4°
Dec
88.1° / -7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 8.1°C | -7.1°C | 30 mm | 3.1 | 10 h 04 | 8 | Strong coverage |
| February | 10.3°C | -5.2°C | 30 mm | 3.5 | 10 h 53 | 18 | Strong coverage |
| March | 14°C | -2.8°C | 26 mm | 3.1 | 11 h 52 | 35 | Strong coverage |
| April | 18°C | -0.5°C | 13 mm | 2 | 13 h 00 | 52 | Strong coverage |
| May | 22.4°C | 3.6°C | 14 mm | 2.2 | 13 h 57 | 74 | Strong coverage |
| June | 27.9°C | 8.6°C | 10 mm | 1.4 | 14 h 28 | 76 | Strong coverage |
| July | 28.6°C | 12.9°C | 73 mm | 8.7 | 14 h 16 | 70 | Strong coverage |
| August | 27.2°C | 12.3°C | 76 mm | 9.2 | 13 h 27 | 73 | Strong coverage |
| September | 24.8°C | 8.3°C | 35 mm | 4 | 12 h 21 | 84 | Strong coverage |
| October | 19.7°C | 1.8°C | 27 mm | 3 | 11 h 15 | 62 | Strong coverage |
| November | 13.2°C | -3.4°C | 25 mm | 2.1 | 10 h 18 | 31 | Strong coverage |
| December | 8.1°C | -7°C | 35 mm | 3.2 | 9 h 51 | 8 | Strong coverage |
What has changed
Mormon Crossing 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
-0.2
Feb
-0.3
Mar
+0.7
Apr
+0.4
May
-1.1
Jun
0.0
Jul
-1.2
Aug
-0.6
Sep
-0.4
Oct
-0.3
Nov
0.0
Dec
0.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C7 Jan 1969 | -31.7°C13 Jan 1963 | 95 mm24 Jan 2010 | 139 mm1957 · driest 0 mm in 1998 | 74 |
| February | 25.6°C26 Feb 1954 | -27.8°C28 Feb 1962 | 39 mm8 Feb 1994 | 100 mm1973 · driest 0 mm in 1972 | 75 |
| March | 28.9°C21 Mar 2026 | -24.4°C4 Mar 1966 | 53 mm3 Mar 2014 | 108 mm1978 · driest 0 mm in 2008 | 76 |
| April | 29.4°C27 Apr 2000 | -16.1°C2 Apr 1975 | 25 mm2 Apr 1999 | 58 mm1999 · driest 0 mm in 1987 | 76 |
| May | 32.8°C31 May 2002 | -10.6°C1 May 1967 | 37 mm5 May 1973 | 78 mm1992 · driest 0 mm in 2005 | 76 |
| June | 37.8°C26 Jun 1970 | -6.1°C2 Jun 1955 | 46 mm5 Jun 2015 | 74 mm2000 · driest 0 mm in 2012 | 75 |
| July | 37.8°C3 Jul 1989 | -1.1°C4 Jul 1968 | 54 mm18 Jul 2021 | 174 mm2013 · driest 2 mm in 1960 | 75 |
| August | 36.7°C9 Aug 1969 | -1.1°C24 Aug 1968 | 111 mm28 Aug 1951 | 205 mm1963 · driest 9 mm in 1998 | 76 |
| September | 34.4°C3 Sep 1996 | -6.1°C30 Sep 1965 | 85 mm7 Sep 1995 | 135 mm1958 · driest 0 mm in 1956 | 76 |
| October | 30.6°C11 Oct 1996 | -12.8°C28 Oct 1970 | 65 mm13 Oct 2025 | 189 mm1972 · driest 0 mm in 2007 | 76 |
| November | 25.6°C12 Nov 1953 | -23.9°C28 Nov 1976 | 61 mm22 Nov 2013 | 126 mm1978 · driest 0 mm in 2005 | 76 |
| December | 21.1°C7 Dec 1958 | -30.0°C22 Dec 1968 | 70 mm14 Dec 1967 | 230 mm1967 · driest 0 mm in 2005 | 75 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 23 | <1 | 1 |
| February | 0 | 0 | 21 | <1 | 1 |
| March | 0 | 0 | 20 | <1 | <1 |
| April | <1 | 0 | 15 | <1 | <1 |
| May | 8 | <1 | 6 | <1 | 0 |
| June | 22 | 8 | <1 | <1 | 0 |
| July | 24 | 9 | 0 | 2 | 0 |
| August | 22 | 5 | 0 | 2 | 0 |
| September | 13 | <1 | <1 | 1 | 0 |
| October | 3 | <1 | 10 | 1 | <1 |
| November | 0 | 0 | 21 | <1 | <1 |
| December | 0 | 0 | 25 | 2 | 2 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 12% | 3% | 8% | 5.4–10.7°C |
| February | 2% | 14% | 3% | 10% | 7.3–13.5°C |
| March | 10% | 13% | 3% | 9% | 10.6–16.3°C |
| April | 37% | 9% | 1% | 3% | 15.5–20.0°C |
| May | 73% | 7% | 1% | 3% | 19.8–24.7°C |
| June | 93% | 6% | <1% | 5% | 26.5–29.5°C |
| July | 71% | 29% | 8% | 36% | 27.4–30.8°C |
| August | 69% | 30% | 8% | 35% | 25.7–29.0°C |
| September | 80% | 16% | 5% | 13% | 23.5–26.6°C |
| October | 54% | 11% | 4% | 8% | 17.1–22.3°C |
| November | 11% | 9% | 3% | 6% | 10.5–16.3°C |
| December | <1% | 12% | 5% | 11% | 6.1–11.4°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 5305546
- NOAA station
- USC00023961 · HEBER (BLACK MESA) RS
- Station distance
- 32.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 27 usable years
- Daylight
- Calculated from latitude 34.62°, 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.