May
Other strong months: September and April
88/100 weather score
China · 1991–2020
Best time to visit
Opal
For Opal, May has the most comfortable weather in our climate comparison. Typical daytime highs are 26.9°C, nights average 13.9°C, and rainfall totals about 15 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthMay
Typical daytime high26.9°C
Typical night-time low13.9°C
May rainfall15 mm
October
Other strong months: April and March
93/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
4 months fit your choices for Opal
The lowest comfort score is 5 out of 100. January, February and December share that score. In January, that is mainly because days reach only 0.1°C, 24° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Opal?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Opal?
May is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 26.9°C and 15 mm of rain.
What is the hottest month in Opal?
July is hottest in this record, with a typical daytime high of 31.9°C and a night-time low of 19.3°C.
Which month has the least rain?
January and December have the lowest monthly rainfall total at 3 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 0.1°C | -10.1°C | 3 mm | 0.9 | 9 h 41 | 5 | Good coverage |
| February | 6.1°C | -4.8°C | 6 mm | 1.2 | 10 h 39 | 5 | Good coverage |
| March | 14.9°C | 3.2°C | 6 mm | 1.1 | 11 h 50 | 49 | Good coverage |
| April | 23°C | 9.5°C | 7 mm | 1 | 13 h 11 | 87 | Good coverage |
| May | 26.9°C | 13.9°C | 15 mm | 2.5 | 14 h 18 | 88 | Good coverage |
| June | 30.6°C | 17.4°C | 10 mm | 2.3 | 14 h 55 | 74 | Good coverage |
| July | 31.9°C | 19.3°C | 13 mm | 2.9 | 14 h 41 | 66 | Good coverage |
| August | 30.9°C | 18°C | 15 mm | 2.9 | 13 h 42 | 72 | Good coverage |
| September | 26.7°C | 13.4°C | 7 mm | 1.7 | 12 h 24 | 88 | Good coverage |
| October | 20.3°C | 6.3°C | 6 mm | 0.9 | 11 h 06 | 72 | Good coverage |
| November | 11.3°C | -1°C | 4 mm | 0.5 | 9 h 58 | 29 | Good coverage |
| December | 2.2°C | -7.1°C | 3 mm | 0.9 | 9 h 25 | 5 | Good coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 18.9°C3 Jan 2000 | -24.4°C12 Jan 1959 | 8 mm13 Jan 2023 | 18 mm2006 · driest 0 mm in 1951 | 75 |
| February | 21.7°C24 Feb 1960 | -23.5°C10 Feb 1974 | 26 mm27 Feb 1976 | 62 mm1976 · driest 0 mm in 2000 | 75 |
| March | 29.2°C19 Mar 2010 | -15.6°C1 Mar 1976 | 36 mm22 Mar 1990 | 45 mm1990 · driest 0 mm in 2015 | 75 |
| April | 34.8°C27 Apr 2011 | -3.6°C7 Apr 1994 | 28 mm22 Apr 2020 | 63 mm2020 · driest 0 mm in 1971 | 75 |
| May | 39.5°C25 May 1951 | -1.0°C15 May 1952 | 40 mm1 May 2004 | 79 mm1964 · driest 0 mm in 1973 | 75 |
| June | 38.6°C27 Jun 1970 | 6.8°C11 Jun 1987 | 24 mm17 Jun 1951 | 29 mm2010 · driest 0 mm in 1984 | 75 |
| July | 40.1°C12 Jul 1958 | 7.9°C6 Jul 1992 | 42 mm30 Jul 1952 | 69 mm1952 · driest 0 mm in 1985 | 75 |
| August | 39.6°C3 Aug 1951 | 7.3°C28 Aug 1951 | 28 mm11 Aug 2018 | 83 mm2016 · driest 0 mm in 1965 | 75 |
| September | 35.0°C2 Sep 1983 | 3.2°C25 Sep 1989 | 22 mm15 Sep 1954 | 49 mm2010 · driest 0 mm in 1996 | 74 |
| October | 30.7°C2 Oct 2021 | -6.4°C29 Oct 1953 | 35 mm12 Oct 2003 | 40 mm2003 · driest 0 mm in 2011 | 74 |
| November | 25.2°C7 Nov 2006 | -16.6°C30 Nov 1962 | 40 mm26 Nov 2020 | 59 mm2020 · driest 0 mm in 1960 | 74 |
| December | 20.4°C7 Dec 2023 | -23.6°C19 Dec 1974 | 16 mm6 Dec 2011 | 25 mm2011 · driest 0 mm in 1964 | 74 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) |
|---|---|---|---|---|
| January | 0 | 0 | 31 | 0 |
| February | 0 | 0 | 25 | <1 |
| March | <1 | 0 | 7 | <1 |
| April | 11 | 2 | <1 | <1 |
| May | 23 | 7 | 0 | <1 |
| June | 28 | 19 | 0 | <1 |
| July | 30 | 25 | 0 | <1 |
| August | 30 | 22 | 0 | <1 |
| September | 21 | 5 | 0 | <1 |
| October | 4 | 0 | 2 | <1 |
| November | 0 | 0 | 18 | <1 |
| December | 0 | 0 | 30 | 0 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 0% | 3% | 0% | <1% | -3.9–3.0°C |
| February | <1% | 5% | <1% | 2% | 1.1–8.8°C |
| March | 14% | 4% | <1% | 1% | 11.6–17.1°C |
| April | 70% | 4% | <1% | 1% | 20.4–24.4°C |
| May | 90% | 7% | 1% | 2% | 24.6–28.9°C |
| June | 94% | 6% | <1% | 2% | 29.1–31.7°C |
| July | 94% | 6% | <1% | 1% | 31.0–33.3°C |
| August | 94% | 7% | <1% | 3% | 29.3–32.2°C |
| September | 93% | 5% | <1% | 2% | 24.9–28.0°C |
| October | 51% | 2% | <1% | <1% | 18.3–21.5°C |
| November | 3% | 2% | <1% | <1% | 8.0–13.3°C |
| December | 0% | 2% | <1% | 0% | -1.5–4.7°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 1280365
- NOAA station
- CHM00051709 · KASHI
- Station distance
- 43 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 22 usable years
- Daylight
- Calculated from latitude 39.29°, 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.
Next step
Choose your month.
Then plan the details.
The weather comparison for Opal is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work