United States · 1991–2020

Best time to visit
Julian.

May leads for comfortable weather in Julian: typically 25.8°C by day, 9.2°C at night, with 46 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortMay

Typical high25.8°C

Typical low9.2°C

Rain in May46 mm

Comfort

May

May · September · October

80climate match

Beach

September

September · June · August

76climate match

Outdoors

April

April · October · May

85climate match

The weakest month is January, scoring 11 against May’s 80 — days reach only 8.9°C, 15° below the 24°C the score treats as ideal, and nights drop to -6.9°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

118.9° / -6.9°

Feb

1810.4° / -5.6°

Mar

4315.8° / -1.5°

Apr

6520.4° / 3.2°

May

8025.8° / 9.2°

Jun

6831.9° / 15.5°

Jul

5034.2° / 18.4°

Aug

5832.7° / 17.4°

Sep

7929° / 12.8°

Oct

7422° / 4.9°

Nov

4115.2° / -1.3°

Dec

118.7° / -6.4°

Monthly climate evidence for Julian — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8.9°C	-6.9°C	13 mm	1.8	9 h 50	11	Strong coverage
February	10.4°C	-5.6°C	10 mm	2	10 h 45	18	Strong coverage
March	15.8°C	-1.5°C	25 mm	3.5	11 h 50	43	Strong coverage
April	20.4°C	3.2°C	39 mm	4.6	13 h 07	65	Strong coverage
May	25.8°C	9.2°C	46 mm	5.6	14 h 10	80	Strong coverage
June	31.9°C	15.5°C	51 mm	5.8	14 h 44	68	Strong coverage
July	34.2°C	18.4°C	78 mm	7.5	14 h 31	50	Strong coverage
August	32.7°C	17.4°C	79 mm	6.1	13 h 36	58	Strong coverage
September	29°C	12.8°C	36 mm	3.4	12 h 23	79	Strong coverage
October	22°C	4.9°C	42 mm	3.3	11 h 09	74	Strong coverage
November	15.2°C	-1.3°C	10 mm	1.9	10 h 06	41	Strong coverage
December	8.7°C	-6.4°C	17 mm	2.5	9 h 35	11	Strong coverage

Records at JOHNSON, 1995–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	27.8°C8 Jan 2006	-22.8°C16 Jan 2024	51 mm25 Jan 2001	86 mm2001 · driest 0 mm in 2016	31
February	31.1°C11 Feb 2017	-27.8°C15 Feb 2021	20 mm27 Feb 2015	61 mm2015 · driest 0 mm in 2021	31
March	38.3°C27 Mar 2026	-19.4°C3 Mar 2014	33 mm24 Mar 2007	98 mm2000 · driest 0 mm in 1997	31
April	35.6°C16 Apr 2002	-10.6°C13 Apr 1997	85 mm30 Apr 2017	195 mm2017 · driest 1 mm in 2022	31
May	40.0°C30 May 2003	-2.8°C3 May 2013	62 mm7 May 2025	171 mm2015 · driest 4 mm in 2009	32
June	42.8°C28 Jun 2013	5.6°C8 Jun 2007	79 mm6 Jun 2025	194 mm2025 · driest 4 mm in 2012	32
July	43.3°C27 Jul 2026	10.6°C5 Jul 1995	69 mm7 Jul 2021	162 mm2020 · driest 16 mm in 2008	32
August	41.1°C25 Aug 2021	10.6°C26 Aug 2010	105 mm10 Aug 2001	164 mm2008 · driest 20 mm in 2000	31
September	41.1°C12 Sep 2021	-0.6°C23 Sep 1995	79 mm12 Sep 2009	126 mm2004 · driest 0 mm in 2019	31
October	37.2°C18 Oct 2016	-13.9°C31 Oct 2019	66 mm22 Oct 2015	141 mm2000 · driest 0 mm in 2016	31
November	32.2°C1 Nov 2016	-16.7°C13 Nov 2014	43 mm9 Nov 2024	147 mm2024 · driest 0 mm in 2021	31
December	27.8°C26 Dec 2025	-26.7°C18 Dec 2016	56 mm30 Dec 2006	138 mm2006 · driest 0 mm in 1999	31

Typical days per month at JOHNSON, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	<1	0	30	<1	2
February	<1	<1	25	<1	2
March	4	<1	19	<1	2
April	9	3	7	1	<1
May	19	10	<1	2	0
June	27	20	0	2	0
July	30	26	0	2	0
August	29	24	0	2	0
September	24	15	<1	1	0
October	12	5	4	1	<1
November	3	<1	19	<1	1
December	<1	0	29	<1	3

How often, not how much — every day in JOHNSON’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	7%	6%	1%	1%	6.5–11.0°C
February	16%	7%	<1%	2%	6.0–15.4°C
March	33%	10%	2%	6%	12.4–19.1°C
April	55%	13%	4%	10%	18.5–23.0°C
May	70%	19%	5%	19%	22.5–28.2°C
June	79%	20%	7%	20%	29.7–34.2°C
July	76%	24%	9%	24%	32.6–35.9°C
August	81%	19%	7%	15%	30.5–34.6°C
September	85%	11%	4%	6%	26.6–31.9°C
October	63%	10%	4%	7%	18.8–25.1°C
November	30%	6%	1%	2%	12.5–17.8°C
December	8%	7%	2%	2%	6.1–12.1°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.

1996Each stripe is one year’s mean temperature against the 30-year average. Warmest: 2012. Coolest: 1997.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5445696
NOAA station: USC00144114 · JOHNSON
Station distance: 10.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 25 usable years
Daylight: Calculated from latitude 37.56°, 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 JOHNSON is what differs

Johnson→Manter→Big Bow→

Or put two places side by side: Julian vs Johnson

Best time to visitJulian.

May

September

April

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Julian.

The whole year,
without the guesswork.

Nearby, measured,
and named.