May
May · June · September
83climate match
United States · 1991–2020
Best time to visit
Saint Clair.
May leads for comfortable weather in Saint Clair: typically 23.8°C by day, 6°C at night, with 15 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortMay
Typical high23.8°C
Typical low6°C
Rain in May15 mm
June
June · July · August
67climate match
October
October · April · May
83climate match
The weakest month is December, scoring 5 against May’s 83 — days reach only 7.1°C, 17° below the 24°C the score treats as ideal, and nights drop to -6.7°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
87.6° / -6.1°
Feb
2311.2° / -4.2°
Mar
4315.8° / -1.4°
Apr
5918.8° / 1.5°
May
8323.8° / 6°
Jun
7329.4° / 9.7°
Jul
6334.4° / 13.4°
Aug
6433.1° / 11.7°
Sep
7228.3° / 7.2°
Oct
6620.9° / 1.6°
Nov
3113.1° / -3.3°
Dec
57.1° / -6.7°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 7.6°C | -6.1°C | 16 mm | 3.2 | 9 h 40 | 8 | Strong coverage |
| February | 11.2°C | -4.2°C | 12 mm | 2.9 | 10 h 39 | 23 | Strong coverage |
| March | 15.8°C | -1.4°C | 12 mm | 2.6 | 11 h 49 | 43 | Strong coverage |
| April | 18.8°C | 1.5°C | 11 mm | 2.3 | 13 h 11 | 59 | Strong coverage |
| May | 23.8°C | 6°C | 15 mm | 2.7 | 14 h 19 | 83 | Strong coverage |
| June | 29.4°C | 9.7°C | 9 mm | 1.5 | 14 h 56 | 73 | Strong coverage |
| July | 34.4°C | 13.4°C | 2 mm | 0.7 | 14 h 41 | 63 | Strong coverage |
| August | 33.1°C | 11.7°C | 3 mm | 0.8 | 13 h 43 | 64 | Strong coverage |
| September | 28.3°C | 7.2°C | 5 mm | 1 | 12 h 24 | 72 | Strong coverage |
| October | 20.9°C | 1.6°C | 10 mm | 1.6 | 11 h 06 | 66 | Strong coverage |
| November | 13.1°C | -3.3°C | 11 mm | 1.8 | 9 h 57 | 31 | Strong coverage |
| December | 7.1°C | -6.7°C | 10 mm | 2.7 | 9 h 24 | 5 | Strong coverage |
What has changed
Saint Clair runs +1.1°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
+1.2
Feb
-0.6
Mar
+0.7
Apr
+1.4
May
+0.6
Jun
+2.2
Jul
+2.3
Aug
+1.8
Sep
+1.6
Oct
+0.4
Nov
+0.7
Dec
+0.6
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 21.7°C22 Jan 1950 | -31.7°C16 Jan 1917 | 43 mm1 Jan 1910 | 76 mm1940 · driest 0 mm in 1953 | 122 |
| February | 25.6°C27 Feb 1921 | -32.8°C6 Feb 1989 | 25 mm3 Feb 1989 | 72 mm1962 · driest 0 mm in 2020 | 122 |
| March | 31.7°C20 Mar 2026 | -17.2°C2 Mar 1971 | 24 mm30 Mar 1954 | 45 mm2011 · driest 0 mm in 1959 | 121 |
| April | 32.2°C30 Apr 2021 | -10.6°C14 Apr 1911 | 37 mm22 Apr 2015 | 58 mm1990 · driest 0 mm in 2017 | 119 |
| May | 38.9°C31 May 1910 | -6.7°C1 May 1967 | 43 mm28 May 1913 | 61 mm1987 · driest 0 mm in 1928 | 120 |
| June | 41.1°C22 Jun 1961 | -2.8°C15 Jun 1994 | 39 mm19 Jun 1977 | 77 mm1977 · driest 0 mm in 2001 | 119 |
| July | 42.2°C23 Jul 2003 | 1.7°C5 Jul 1948 | 21 mm23 Jul 1913 | 39 mm1913 · driest 0 mm in 2003 | 119 |
| August | 40.6°C12 Aug 1960 | 0.6°C23 Aug 1960 | 31 mm26 Aug 1920 | 48 mm1920 · driest 0 mm in 1991 | 116 |
| September | 40.6°C6 Sep 2022 | -6.1°C26 Sep 1934 | 28 mm4 Sep 1967 | 37 mm1998 · driest 0 mm in 1947 | 119 |
| October | 33.3°C2 Oct 2024 | -14.4°C30 Oct 2019 | 21 mm16 Oct 2016 | 63 mm2010 · driest 0 mm in 2014 | 118 |
| November | 27.2°C14 Nov 1906 | -18.3°C29 Nov 1906 | 30 mm2 Nov 2015 | 45 mm2015 · driest 0 mm in 1929 | 117 |
| December | 22.2°C25 Dec 1907 | -29.4°C22 Dec 1990 | 32 mm31 Dec 2022 | 55 mm1931 · driest 0 mm in 2011 | 118 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 28 | <1 | 1 |
| February | 0 | 0 | 24 | <1 | <1 |
| March | <1 | 0 | 20 | <1 | <1 |
| April | 4 | <1 | 12 | <1 | <1 |
| May | 14 | 4 | 2 | <1 | 0 |
| June | 24 | 17 | <1 | <1 | 0 |
| July | 31 | 29 | 0 | 0 | 0 |
| August | 30 | 26 | 0 | 0 | 0 |
| September | 23 | 13 | 1 | <1 | 0 |
| October | 8 | 1 | 12 | <1 | 0 |
| November | <1 | 0 | 23 | <1 | <1 |
| December | 0 | 0 | 28 | <1 | <1 |
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | <1% | 10% | <1% | 6% | 2.9–10.4°C |
| February | 3% | 11% | <1% | 7% | 7.1–13.8°C |
| March | 19% | 9% | <1% | 4% | 12.2–18.1°C |
| April | 46% | 8% | <1% | 4% | 16.3–21.6°C |
| May | 72% | 9% | 1% | 7% | 20.3–26.1°C |
| June | 90% | 6% | <1% | 3% | 25.8–31.5°C |
| July | 97% | 3% | <1% | 1% | 31.6–36.1°C |
| August | 96% | 4% | <1% | 2% | 30.6–34.5°C |
| September | 90% | 4% | <1% | 2% | 25.4–29.8°C |
| October | 60% | 7% | 1% | 3% | 18.1–23.4°C |
| November | 10% | 7% | <1% | 3% | 10.3–15.6°C |
| December | <1% | 9% | <1% | 6% | 5.0–10.2°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 5511635
- NOAA station
- USC00262780 · FALLON EXP STN
- Station distance
- 3.4 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 25 usable years
- Daylight
- Calculated from latitude 39.44°, 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.