United States · 1991–2020

Best time to visit
Byron.

October leads for comfortable weather in Byron: typically 26.3°C by day, 12.2°C at night, with 17 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortOctober

Typical high26.3°C

Typical low12.2°C

Rain in October17 mm

Comfort

October

October · April · May

88climate match

Beach

June

June · September · August

77climate match

Outdoors

March

March · April · November

91climate match

The weakest month is January, scoring 39 against October’s 88 — days reach only 13.7°C, 10° 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

3913.7° / 4.5°

Feb

5316.7° / 6.3°

Mar

7019.8° / 8.1°

Apr

8723° / 9.9°

May

8627° / 12.6°

Jun

7631.2° / 15.1°

Jul

6434.2° / 16.5°

Aug

6633.7° / 16.4°

Sep

7431.7° / 15.3°

Oct

8826.3° / 12.2°

Nov

6818.8° / 7.6°

Dec

4013.9° / 4.5°

Monthly climate evidence for Byron — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	13.7°C	4.5°C	64 mm	7.8	9 h 48	39	Strong coverage
February	16.7°C	6.3°C	58 mm	7.9	10 h 44	53	Strong coverage
March	19.8°C	8.1°C	40 mm	6.5	11 h 50	70	Strong coverage
April	23°C	9.9°C	21 mm	3.7	13 h 07	87	Strong coverage
May	27°C	12.6°C	13 mm	2.1	14 h 12	86	Strong coverage
June	31.2°C	15.1°C	3 mm	0.6	14 h 46	76	Strong coverage
July	34.2°C	16.5°C	0 mm	0	14 h 33	64	Strong coverage
August	33.7°C	16.4°C	0 mm	0.1	13 h 37	66	Strong coverage
September	31.7°C	15.3°C	2 mm	0.4	12 h 23	74	Strong coverage
October	26.3°C	12.2°C	17 mm	1.9	11 h 09	88	Strong coverage
November	18.8°C	7.6°C	33 mm	4.6	10 h 04	68	Strong coverage
December	13.9°C	4.5°C	60 mm	7.6	9 h 33	40	Strong coverage

What has changed

Byron runs +1.8°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

+3.0

Feb

+1.4

Mar

+1.4

Apr

+2.1

May

+1.3

Jun

+2.3

Jul

+1.5

Aug

+1.4

Sep

+1.8

Oct

+1.7

Nov

+1.4

Dec

+2.2

October daytime highs, 2011–2025. Last recorded: 25.9°C.

Records at TRACY PUMPING PLT, 1955–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.3°C18 Jan 2021	-7.8°C2 Jan 1961	71 mm4 Jan 1982	180 mm2023 · driest 1 mm in 2015	71
February	26.7°C28 Feb 2026	-5.0°C6 Feb 1989	53 mm13 Feb 1987	185 mm1998 · driest 0 mm in 2022	72
March	32.8°C29 Mar 2026	-3.9°C4 Mar 1966	52 mm10 Mar 2023	150 mm1983 · driest 0 mm in 1956	72
April	36.1°C30 Apr 1996	-1.7°C18 Apr 1995	28 mm28 Apr 1983	92 mm1983 · driest 0 mm in 2021	72
May	41.7°C31 May 2021	1.1°C13 May 1968	29 mm2 May 1971	80 mm1998 · driest 0 mm in 2025	72
June	44.4°C15 Jun 1961	2.8°C6 Jun 1988	33 mm8 Jun 1964	46 mm1964 · driest 0 mm in 2008	72
July	44.4°C10 Jul 2021	6.7°C8 Jul 1966	16 mm2 Jul 1980	16 mm1980 · driest 0 mm in 2000	72
August	43.9°C10 Aug 1971	5.6°C4 Aug 1956	15 mm21 Aug 1968	19 mm1976 · driest 0 mm in 2004	71
September	44.4°C7 Sep 2022	4.4°C16 Sep 1992	62 mm18 Sep 1959	66 mm1959 · driest 0 mm in 2006	71
October	39.4°C2 Oct 2024	-1.1°C30 Oct 1971	70 mm13 Oct 1962	98 mm2000 · driest 0 mm in 2002	71
November	29.4°C10 Nov 1955	-4.4°C26 Nov 1993	53 mm8 Nov 2002	125 mm1983 · driest 0 mm in 1959	70
December	23.3°C1 Dec 1995	-8.3°C26 Dec 1990	64 mm23 Dec 1955	173 mm2022 · driest 0 mm in 1989	71

Typical days per month at TRACY PUMPING PLT, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	4	2
February	0	0	<1	2
March	4	0	0	1
April	10	2	0	<1
May	18	9	0	<1
June	24	17	0	<1
July	28	25	0	0
August	28	25	0	0
September	26	19	0	0
October	19	6	0	<1
November	2	0	<1	1
December	0	0	4	2

The best month has moved. On the 1961–1990 numbers the strongest month here was October (scoring 87); on 2011–2025 it is April (90). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in TRACY PUMPING PLT’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	2%	24%	7%	29%	11.0–15.5°C
February	17%	25%	6%	32%	14.9–19.1°C
March	43%	20%	4%	21%	17.1–21.9°C
April	68%	13%	2%	11%	20.1–25.6°C
May	89%	5%	<1%	3%	24.3–29.3°C
June	98%	2%	<1%	<1%	28.3–33.8°C
July	100%	<1%	0%	0%	31.9–36.2°C
August	99%	<1%	<1%	<1%	32.0–35.4°C
September	98%	2%	<1%	<1%	29.3–33.3°C
October	89%	6%	2%	5%	23.8–28.4°C
November	35%	16%	4%	19%	16.1–20.5°C
December	3%	22%	6%	26%	11.2–15.4°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.

1956Each stripe is one year’s mean temperature against the 69-year average. Warmest: 2014. Coolest: 1963.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5332307
NOAA station: USC00049001 · TRACY PUMPING PLT
Station distance: 9.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 37.87°, 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.

These places read the same station, so their numbers are identical — distance from TRACY PUMPING PLT is what differs

Discovery Bay→Mountain House→Altamont→Midway→Orwood→Trull→

Or put two places side by side: Byron vs Discovery Bay

Best time to visitByron.

October

June

March

The whole year,without the guesswork.

Byron runs +1.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Byron.

The whole year,
without the guesswork.

Byron runs +1.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.