May
May · June · September
87climate match
United States · 1991–2020
Best time to visit
Byron.
May leads for comfortable weather in Byron: typically 23.7°C by day, 8.8°C at night, with 19 mm of rain. Based on measured 1991–2020 NOAA station history.
Best comfortMay
Typical high23.7°C
Typical low8.8°C
Rain in May19 mm
July
July · August · June
73climate match
May
May · April · October
85climate match
The weakest month is January, scoring 5 against May’s 87 — days reach only 4.8°C, 19° 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
54.8° / -3.1°
Feb
158.3° / -2.2°
Mar
4013.8° / 1.1°
Apr
6118.3° / 4.2°
May
8723.7° / 8.8°
Jun
8327.5° / 11.9°
Jul
7232.5° / 15°
Aug
7232.1° / 14.1°
Sep
8226.5° / 9.7°
Oct
6218.5° / 4.5°
Nov
239.8° / -0.5°
Dec
54.4° / -3.3°
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 4.8°C | -3.1°C | 28 mm | 6.1 | 8 h 59 | 5 | Good coverage |
| February | 8.3°C | -2.2°C | 21 mm | 4.9 | 10 h 15 | 15 | Good coverage |
| March | 13.8°C | 1.1°C | 19 mm | 5 | 11 h 45 | 40 | Good coverage |
| April | 18.3°C | 4.2°C | 16 mm | 3.5 | 13 h 29 | 61 | Good coverage |
| May | 23.7°C | 8.8°C | 19 mm | 4 | 14 h 56 | 87 | Strong coverage |
| June | 27.5°C | 11.9°C | 15 mm | 2.7 | 15 h 45 | 83 | Strong coverage |
| July | 32.5°C | 15°C | 5 mm | 1.2 | 15 h 26 | 72 | Strong coverage |
| August | 32.1°C | 14.1°C | 5 mm | 1 | 14 h 10 | 72 | Strong coverage |
| September | 26.5°C | 9.7°C | 7 mm | 2 | 12 h 29 | 82 | Good coverage |
| October | 18.5°C | 4.5°C | 20 mm | 4.4 | 10 h 50 | 62 | Strong coverage |
| November | 9.8°C | -0.5°C | 23 mm | 5.1 | 9 h 22 | 23 | Strong coverage |
| December | 4.4°C | -3.3°C | 33 mm | 5.9 | 8 h 38 | 5 | Strong coverage |
What has changed
Byron runs +0.8°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
-1.2
Mar
-0.2
Apr
-0.2
May
+1.2
Jun
+1.3
Jul
+2.6
Aug
+2.5
Sep
+1.8
Oct
+0.5
Nov
+0.3
Dec
+0.2
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 20.6°C31 Jan 1971 | -28.9°C21 Jan 1930 | 32 mm7 Jan 1948 | 75 mm1970 · driest 0 mm in 2014 | 93 |
| February | 20.6°C21 Feb 1988 | -28.9°C3 Feb 1950 | 26 mm2 Feb 1961 | 81 mm1940 · driest 0 mm in 1988 | 93 |
| March | 27.2°C26 Mar 1960 | -14.4°C5 Mar 1955 | 25 mm9 Mar 2026 | 48 mm1957 · driest 1 mm in 1935 | 94 |
| April | 32.8°C25 Apr 1977 | -10.0°C2 Apr 1935 | 23 mm24 Apr 1974 | 56 mm1992 · driest 0 mm in 1999 | 93 |
| May | 37.8°C24 May 2001 | -3.3°C2 May 1938 | 38 mm13 May 2015 | 58 mm1972 · driest 0 mm in 2021 | 96 |
| June | 45.6°C30 Jun 2021 | -1.1°C30 Jun 2011 | 43 mm6 Jun 1957 | 70 mm1950 · driest 0 mm in 2003 | 96 |
| July | 43.9°C14 Jul 2002 | -0.6°C23 Jul 2012 | 18 mm3 Jul 1978 | 30 mm1966 · driest 0 mm in 1967 | 95 |
| August | 41.1°C5 Aug 1998 | 2.2°C20 Aug 2000 | 23 mm30 Aug 1947 | 39 mm1977 · driest 0 mm in 2006 | 95 |
| September | 38.3°C1 Sep 2022 | -6.1°C24 Sep 2000 | 25 mm24 Sep 1986 | 46 mm1986 · driest 0 mm in 1999 | 94 |
| October | 32.2°C2 Oct 1932 | -11.7°C30 Oct 1935 | 42 mm2 Oct 1957 | 70 mm2016 · driest 0 mm in 1987 | 97 |
| November | 24.4°C13 Nov 1987 | -21.7°C24 Nov 1985 | 21 mm29 Nov 1926 | 93 mm1926 · driest 0 mm in 1976 | 98 |
| December | 21.1°C2 Dec 2021 | -23.9°C30 Dec 1968 | 38 mm18 Dec 2007 | 88 mm1964 · driest 1 mm in 1949 | 97 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 24 | <1 |
| February | 0 | 0 | 20 | <1 |
| March | <1 | 0 | 11 | <1 |
| April | 2 | 0 | 4 | <1 |
| May | 12 | 4 | <1 | <1 |
| June | 21 | 9 | 0 | <1 |
| July | 30 | 23 | 0 | 0 |
| August | 30 | 22 | 0 | <1 |
| September | 19 | 7 | <1 | 0 |
| October | 3 | <1 | 4 | <1 |
| November | 0 | 0 | 17 | <1 |
| December | 0 | 0 | 23 | <1 |
The best month has moved. On the 1961–1990 numbers the strongest month here was September (scoring 84); on 2011–2025 it is May (88). 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% | 18% | 2% | 18% | -1.5–7.6°C |
| February | <1% | 16% | 1% | 12% | 4.1–10.9°C |
| March | 7% | 13% | <1% | 7% | 11.3–15.9°C |
| April | 33% | 11% | <1% | 8% | 16.0–21.0°C |
| May | 69% | 12% | 1% | 7% | 20.6–25.7°C |
| June | 87% | 10% | 1% | 5% | 25.0–29.5°C |
| July | 97% | 3% | <1% | <1% | 29.3–34.2°C |
| August | 96% | 4% | <1% | 2% | 28.1–33.1°C |
| September | 85% | 7% | <1% | 4% | 22.7–28.0°C |
| October | 35% | 13% | 1% | 11% | 16.4–20.7°C |
| November | <1% | 19% | 2% | 19% | 6.8–11.6°C |
| December | 0% | 20% | 2% | 18% | 1.7–6.9°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 5788690
- NOAA station
- USC00456768 · PROSSER
- Station distance
- 9.1 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 23 usable years
- Daylight
- Calculated from latitude 46.19°, 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.