United States · 1991–2020

Best time to visit
Bystrom.

April leads for comfortable weather in Bystrom: typically 23.3°C by day, 9.6°C at night, with 25 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortApril

Typical high23.3°C

Typical low9.6°C

Rain in April25 mm

Comfort

April

April · October · May

87climate match

Beach

September

September · June · August

76climate match

Outdoors

March

March · November · April

90climate match

The weakest month is January, scoring 38 against April’s 87 — days reach only 13.4°C, 11° 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

3813.4° / 4.3°

Feb

5316.8° / 5.9°

Mar

7020.1° / 7.8°

Apr

8723.3° / 9.6°

May

8327.8° / 12.5°

Jun

7232.1° / 15.5°

Jul

5935° / 17.6°

Aug

6334.2° / 17.1°

Sep

7431.7° / 15.2°

Oct

8726° / 11.2°

Nov

6718.7° / 6.7°

Dec

3913.5° / 4°

Monthly climate evidence for Bystrom — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	13.4°C	4.3°C	65 mm	7.3	9 h 50	38	Strong coverage
February	16.8°C	5.9°C	56 mm	7.3	10 h 44	53	Strong coverage
March	20.1°C	7.8°C	45 mm	6.6	11 h 50	70	Strong coverage
April	23.3°C	9.6°C	25 mm	3.6	13 h 07	87	Strong coverage
May	27.8°C	12.5°C	17 mm	2.1	14 h 10	83	Strong coverage
June	32.1°C	15.5°C	4 mm	0.8	14 h 45	72	Strong coverage
July	35°C	17.6°C	0 mm	0.1	14 h 31	59	Strong coverage
August	34.2°C	17.1°C	0 mm	0.1	13 h 37	63	Strong coverage
September	31.7°C	15.2°C	1 mm	0.3	12 h 23	74	Strong coverage
October	26°C	11.2°C	14 mm	1.9	11 h 09	87	Strong coverage
November	18.7°C	6.7°C	27 mm	4.2	10 h 06	67	Strong coverage
December	13.5°C	4°C	56 mm	6.9	9 h 34	39	Strong coverage

What has changed

Bystrom 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

+2.5

Feb

+0.6

Mar

+0.2

Apr

+0.8

May

+0.4

Jun

+1.4

Jul

+1.0

Aug

+1.2

Sep

+1.0

Oct

+0.8

Nov

+1.2

Dec

+2.0

April daytime highs, 2011–2025. Last recorded: 23.7°C.

Records at MODESTO AP, 1927–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	23.9°C17 Jan 1998	-7.8°C11 Jan 1949	63 mm27 Jan 2021	185 mm1995 · driest 0 mm in 2022	99
February	26.7°C28 Feb 2026	-4.4°C6 Feb 1989	49 mm3 Feb 1998	224 mm1998 · driest 0 mm in 2020	99
March	32.8°C18 Mar 2026	-2.8°C2 Mar 1971	69 mm4 Mar 1978	165 mm1982 · driest 0 mm in 1934	98
April	37.8°C30 Apr 1981	-1.1°C7 Apr 1929	51 mm2 Apr 1958	124 mm1958 · driest 0 mm in 2008	99
May	41.7°C17 May 2009	0.0°C5 May 1959	42 mm12 May 1998	100 mm1998 · driest 0 mm in 1973	100
June	44.4°C15 Jun 1961	3.9°C7 Jun 1950	29 mm8 Jun 2000	34 mm2011 · driest 0 mm in 2021	100
July	45.0°C24 Jul 2006	7.8°C8 Jul 1935	17 mm9 Jul 1974	18 mm1974 · driest 0 mm in 1943	100
August	43.9°C16 Aug 2020	7.8°C30 Aug 1957	15 mm18 Aug 1975	19 mm1965 · driest 0 mm in 1968	97
September	44.4°C6 Sep 2022	4.4°C26 Sep 1948	47 mm18 Sep 1959	56 mm1983 · driest 0 mm in 2003	99
October	40.0°C2 Oct 2024	-1.7°C31 Oct 1935	45 mm7 Oct 1973	71 mm2021 · driest 0 mm in 1988	99
November	31.1°C2 Nov 1997	-3.9°C17 Nov 1961	57 mm28 Nov 1970	153 mm1970 · driest 0 mm in 1933	98
December	23.9°C1 Dec 1977	-7.8°C13 Dec 1932	55 mm11 Dec 2014	176 mm2022 · driest 0 mm in 1989	99

Typical days per month at MODESTO AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	5	2
February	<1	0	1	2
March	5	<1	0	2
April	11	3	0	<1
May	23	11	0	<1
June	28	21	0	<1
July	31	29	0	0
August	31	28	0	0
September	28	21	0	0
October	19	6	0	<1
November	3	<1	1	<1
December	0	0	6	2

How often, not how much — every day in MODESTO AP’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	1%	24%	7%	28%	9.8–14.7°C
February	16%	24%	7%	30%	14.4–18.3°C
March	44%	21%	6%	22%	16.6–22.3°C
April	72%	12%	3%	8%	20.4–25.8°C
May	92%	5%	<1%	2%	24.4–29.7°C
June	98%	2%	<1%	<1%	29.1–34.1°C
July	100%	<1%	<1%	0%	33.0–36.6°C
August	99%	<1%	<1%	<1%	31.7–35.4°C
September	98%	2%	<1%	<1%	29.0–32.8°C
October	88%	7%	1%	4%	23.5–27.9°C
November	33%	14%	4%	15%	15.7–20.5°C
December	2%	22%	7%	25%	10.5–14.9°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.

1928Each stripe is one year’s mean temperature against the 94-year average. Warmest: 2016. Coolest: 1949.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5332318
NOAA station: USW00023258 · MODESTO AP
Station distance: 2.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 37.62°, 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.

These places read the same station, so their numbers are identical — distance from MODESTO AP is what differs

Modesto→Ceres→Riverbank→Oakdale→Patterson→Salida→

Or put two places side by side: Bystrom vs Modesto

Best time to visitBystrom.