July
July · August · June
92climate match
United States · 1991–2020
Best time to visit
Lyman.
July leads for comfortable weather in Lyman: typically 23.8°C by day, 11.7°C at night, with 35 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortJuly
Typical high23.8°C
Typical low11.7°C
Rain in July35 mm
August
August · July · June
58climate match
June
June · July · September
85climate match
The weakest month is January, scoring 5 against July’s 92 — days reach only 8.1°C, 16° 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
58.1° / 1.4°
Feb
109.6° / 1.8°
Mar
1611.9° / 3.4°
Apr
3314.9° / 5.1°
May
5618.5° / 8.2°
Jun
7120.7° / 10.3°
Jul
9223.8° / 11.7°
Aug
9124.3° / 11.8°
Sep
7121° / 9.6°
Oct
3615.6° / 6.4°
Nov
510.5° / 3.7°
Dec
57.4° / 1.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 8.1°C | 1.4°C | 154 mm | 16.2 | 8 h 43 | 5 | Strong coverage |
| February | 9.6°C | 1.8°C | 101 mm | 13 | 10 h 06 | 10 | Strong coverage |
| March | 11.9°C | 3.4°C | 119 mm | 15.9 | 11 h 44 | 16 | Strong coverage |
| April | 14.9°C | 5.1°C | 106 mm | 13.5 | 13 h 36 | 33 | Strong coverage |
| May | 18.5°C | 8.2°C | 83 mm | 10.1 | 15 h 12 | 56 | Strong coverage |
| June | 20.7°C | 10.3°C | 67 mm | 9.1 | 16 h 06 | 71 | Strong coverage |
| July | 23.8°C | 11.7°C | 35 mm | 4.7 | 15 h 44 | 92 | Strong coverage |
| August | 24.3°C | 11.8°C | 38 mm | 4.4 | 14 h 20 | 91 | Strong coverage |
| September | 21°C | 9.6°C | 73 mm | 8.3 | 12 h 31 | 71 | Strong coverage |
| October | 15.6°C | 6.4°C | 123 mm | 12.6 | 10 h 43 | 36 | Strong coverage |
| November | 10.5°C | 3.7°C | 179 mm | 17.4 | 9 h 07 | 5 | Strong coverage |
| December | 7.4°C | 1.3°C | 137 mm | 16.7 | 8 h 19 | 5 | Strong coverage |
What has changed
Lyman 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
+0.7
Feb
-1.4
Mar
+0.1
Apr
+0.1
May
+0.7
Jun
0.0
Jul
+1.1
Aug
+1.3
Sep
+0.6
Oct
-0.1
Nov
0.0
Dec
0.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.0°C27 Jan 2015 | -18.9°C26 Jan 1957 | 82 mm22 Jan 1935 | 401 mm1971 · driest 22 mm in 1985 | 128 |
| February | 23.3°C28 Feb 1986 | -18.3°C1 Feb 1950 | 84 mm16 Feb 1949 | 275 mm1961 · driest 14 mm in 1993 | 129 |
| March | 27.8°C19 Mar 1928 | -13.3°C4 Mar 1955 | 74 mm9 Mar 1916 | 283 mm1932 · driest 26 mm in 1930 | 129 |
| April | 34.4°C23 Apr 1910 | -3.9°C30 Apr 1954 | 57 mm14 Apr 2000 | 195 mm2018 · driest 12 mm in 1951 | 130 |
| May | 35.0°C31 May 1910 | -3.9°C5 May 1906 | 56 mm20 May 1912 | 171 mm1996 · driest 5 mm in 1924 | 129 |
| June | 37.2°C30 Jun 1915 | -1.1°C16 Jun 1908 | 64 mm12 Jun 2001 | 189 mm1990 · driest 3 mm in 1922 | 129 |
| July | 36.7°C30 Jul 2009 | -0.6°C11 Jul 1901 | 82 mm14 Jul 2011 | 127 mm1939 · driest 0 mm in 1930 | 126 |
| August | 36.1°C9 Aug 1960 | 1.1°C24 Aug 1910 | 69 mm22 Aug 2004 | 192 mm2004 · driest 0 mm in 1930 | 127 |
| September | 32.8°C5 Sep 1944 | -2.2°C26 Sep 1912 | 84 mm1 Sep 2016 | 212 mm1903 · driest 3 mm in 2022 | 129 |
| October | 30.0°C2 Oct 1987 | -6.7°C30 Oct 1935 | 75 mm25 Oct 1945 | 272 mm2009 · driest 7 mm in 1987 | 130 |
| November | 24.4°C2 Nov 1908 | -16.1°C14 Nov 1955 | 102 mm18 Nov 1911 | 419 mm1990 · driest 27 mm in 1952 | 129 |
| December | 23.3°C5 Dec 1939 | -17.2°C28 Dec 1968 | 62 mm25 Dec 1967 | 470 mm1917 · driest 29 mm in 1985 | 130 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 11 | 5 | 1 |
| February | 0 | 0 | 9 | 3 | <1 |
| March | 0 | 0 | 4 | 4 | <1 |
| April | <1 | 0 | 1 | 4 | 0 |
| May | 2 | 0 | <1 | 3 | 0 |
| June | 4 | <1 | 0 | 2 | 0 |
| July | 12 | 2 | 0 | 1 | 0 |
| August | 15 | 1 | 0 | 1 | 0 |
| September | 4 | <1 | 0 | 3 | 0 |
| October | <1 | 0 | 1 | 5 | <1 |
| November | 0 | 0 | 5 | 6 | <1 |
| December | 0 | 0 | 10 | 5 | 1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 89); on 2011–2025 it is July (94). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Warm & dry days | Wet days | Washouts | Week with 3+ wet days | Daytime mean has ranged |
|---|---|---|---|---|---|
| January | 0% | 53% | 16% | 69% | 4.0–9.8°C |
| February | <1% | 49% | 13% | 67% | 6.7–11.7°C |
| March | 2% | 49% | 12% | 67% | 9.9–13.9°C |
| April | 11% | 43% | 10% | 55% | 13.3–17.3°C |
| May | 32% | 32% | 8% | 39% | 16.7–20.6°C |
| June | 53% | 29% | 7% | 33% | 19.3–23.1°C |
| July | 80% | 15% | 4% | 12% | 21.9–26.1°C |
| August | 79% | 16% | 5% | 18% | 22.1–25.6°C |
| September | 51% | 28% | 9% | 33% | 18.9–22.7°C |
| October | 11% | 41% | 14% | 58% | 14.1–17.7°C |
| November | <1% | 58% | 20% | 78% | 8.5–12.7°C |
| December | 0% | 56% | 18% | 75% | 5.1–9.3°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 5802013
- NOAA station
- USC00457507 · SEDRO-WOOLLEY
- Station distance
- 13.2 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 26 usable years
- Daylight
- Calculated from latitude 48.53°, 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.