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Post by Benfxmth on May 31, 2021 10:16:17 GMT -5
This is a thread dedicated to monthly summaries for your city/town/location for May 2021. Overall, this has been a gay, below average May with cool weather mid-month, and lacking sustained warmth [refer to this post for weather boxes for the main airports for the Rome area]. Unfortunately for some reason my PWS didn't record rainfall amounts properly earlier this month, seems fine though (hence the "NA"s for precipitation), but at least this May has been drier than normal. Here's data for my PWS:   Average dew point (true average since May 7th): 11.6°C (52.9°F) Average dew point (min. dew point + difference between max/min DP / 2 since May 1st): 11.3°C (52.4°F) Average dew point (min. dew point + difference between max/min DP / 2 since May 7th): 11.6°C (52.8°F) Interesting how similar average DP's came out to be, FWIW. Daily charts: |
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Post by greysrigging on May 31, 2021 16:38:33 GMT -5
Darwin Airport May 2021   |
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Post by MET on May 31, 2021 16:45:53 GMT -5
May 2021 Summary
May 2021 was very cold, wet and cloudy. High pressure blocking to the north saw the jetstream diving over and south of the UK, with cold-trough conditions dominating.
It was the coldest May since 1996, and the wettest since 1967.
It was the coldest April-May combination since 1983.
The highest temperature of the spring in Sheffield occurred on 31st March, not beaten at any time during April or May. The rainfall was nearly 200% of average. Rain was a mix of heavy convective downpours and frontal rain, mostly the latter.
Sleet and snow was reported in higher areas of the city.
The highlight of the month was the thunderstorms on the evening of 11th, during which a house in Sheffield was struck by lightning.
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Post by Strewthless on May 31, 2021 17:32:44 GMT -5
A month that will live in infamy.  Wales as a whole had the coolest May in over 50 years and the wettest since records began in 1862. It broke that rainfall record with a week still left to go in the month. Overall, I seemed to escape the worst of the rain, but not the cold. |
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Post by Giorbanguly on May 31, 2021 20:06:15 GMT -5
May 2021 Summary
May 2021 was very cold, wet and cloudy. High pressure blocking to the north saw the jetstream diving over and south of the UK, with cold-trough conditions dominating.
It was the coldest May since 1996, and the wettest since 1967.
It was the coldest April-May combination since 1983.
The highest temperature of the spring in Sheffield occurred on 31st March, not beaten at any time during April or May. The rainfall was nearly 200% of average. Rain was a mix of heavy convective downpours and frontal rain, mostly the latter.
Sleet and snow was reported in higher areas of the city.
The highlight of the month was the thunderstorms on the evening of 11th, during which a house in Sheffield was struck by lightning.
14.5c highs?! March here was warmer than that. What kind of a Mickey Mouse spring are you having there |
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Post by MET on May 31, 2021 20:11:43 GMT -5
14.5c highs?! March here was warmer than that. What kind of a Mickey Mouse spring are you having there We're not really known for having warm springs in Yorkshire, at the best of times. This one was close to the worst of times. |
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Post by Beercules on May 31, 2021 22:06:33 GMT -5
The Summary, for the Aeropuerto De' Renmarke', for the Month of Gay, 2021. 'Twas a cloudy month. Not much else to say. Sunshine, recorded at the Loxton station (40km SSW) was 156.2 hrs (5.4hrs/day), which was 0.9 hrs/day below avg. Of note is the -5.1C low on the last day of the month, which was the coldest May temp on record at either Renmark site since records began in 1889. Personally, it coincided with my days off so I was high, and got to experience it while being high. I took pics of the sunrise on the morning in question while being high, but have to sort them out.
Monomolies: high: +0.4C low: -0.7C rain: -11.2mm sun: -0.9hrs/day  
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Post by Steelernation on May 31, 2021 23:45:28 GMT -5
May was the 11th wettest, and below average, especially from the first half. No real heat either. Average high: 68.5 (-2.4) Average low: 44.0 (-0.1) Mean: 56.2 (-1.3) Precipitation: 5.52” (+2.80”, 203%) Precip days: 9 Snowfall: 2.7” (+1.1”, 169%) Snow days: 2 Max snow depth: 2” on the 10th Days snow lying: 1 Highest temp: 86 on the 1st Lowest temp: 32 on the 10th and 11th Highest low: 52 on the 23rd Lowest high: 42 on the 11th Here’s the month using midnight to midnight:  And the year:  |
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Post by tommyFL on May 31, 2021 23:47:07 GMT -5
A very dry, warm May. Quite unusual in that it had a very hot first week, a stable mid-month with low diurnal ranges, and the lowest temp recorded during the second half. It's also odd how the first half was significantly wetter than the second.  True daily mean (average of 5-minute observations): 76.7 F (24.8 C) Max daily precip: 0.48" (12.2 mm) Max precip rate (10-min mean): 2.72"/hr (69.1 mm/hr) Max precip rate (1-min mean): 4.20"/hr (106.7 mm/hr) Max RH: 99% Min RH: 32% Max dew point: 79.3 F (26.3 C) Min dew point: 53.8 F (12.1 C) Max heat index: 107.4 F (41.9 C) Daily chart:  Temp graph:  |
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Post by Moron on Jun 1, 2021 0:34:39 GMT -5
A welcome end to Autumn and start to winter (particularly the last ten days of the month), wet, cloudy and pretty mild at nights. Also Perth station for some reason didn't record a maximum on the 11th...but it did show a 3pm reading of 28.0C so I've used the same maximum at Perth Airport (the closest which recorded 29.1C...realistically it's probably closer to 28.8, 28.9 or 29.0C but it's the best we'll get). The month started stable with a front on the 4th-6th bringing good falls especially to the north of the city. Some warmth on the 10th-11th was followed by low diurnals from the 14th-17th and cloudy skies. Cold fronts on the 22nd-23rd and 27th-28th ended the month with good falls all-round the city and some pretty wintry days. Oh yeah anomalies for Jandakot can now be 1991-2020 Jandakot: High Max: 28.5C (11th) Mean Max: 22.1C (+0.0C) Low Max: 15.2C (24th) High Min: 17.5C (4th) Mean Min: 11.0C (+1.8C) Low Min: 4.4C (26th) Rainfall: 110.6mm (118.5% of average 93.3mm. More like 105% for 1972-2020 rainfall averages) Rain Days: 12 (mean 11.1) Sun: 189.6 hrs  Perth: High Max: 29.1C (11th) Mean Max: 22.2C (-0.1C) Low Max: 14.7C (24th) High Min: 17.5C (4th) Mean Min: 11.6C (+1.2C) Low Min: 5.4C (26th) Rainfall: 113.6mm (129.5% of average 87.7mm) Rain Days: 10 (mean 11.2) Sun: 189.6hrs  |
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Post by chesternz on Jun 1, 2021 1:27:51 GMT -5
Bangkok, Bang Na Agromet. siteMaximaHighest: 37.6 CMean: 34.2 CLowest: 31.3 C MinimaHighest: 28.9 C Mean: 24.5 CLowest: 19.2 CRainTotal: 219.2 mm Highest 24 hr total: 136.2 mm  Rain days > 1 mm: 10 Rain days > 10 mm: 4 Rain days > 20 mm: 2 Pretty average month but sunnier than usual with sporadic heavy rain. A disappointing lack of storms.
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Post by knot on Jun 1, 2021 1:40:48 GMT -5
May 2021 Summary   Bang-on average in both temps and precip; however, the first half of the month was strikingly warm (by South West Slopes standards), making for a fairly variable month. Some mediocre rain events here and there—nothing to write home about. The max temp on the 16th @ Hunters Hill unfortunately ran afoul of the dreaded 9 AM reset; was just 4.0° C before the reset (easily the most wintry day of the month—struggled above 2° C all day). I recorded 0.7 cm of wet snow/sleet on the 15th, so my first official "snowy day" of 2021. Anomalies @ Hunters Hill (1993–2020)• Mean Maximum: 12.0° C (+0.2° C) • Mean Minimum: 5.7° C (+0.3° C) • Precipitation: 109.0 mm (110.00%) 
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Post by Beercules on Jun 1, 2021 1:55:15 GMT -5
The 9am reset is the worst form of cancer in existence.
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Post by jgtheone on Jun 1, 2021 4:54:17 GMT -5
Melbourne Airport May 2021 Summary:Average max: 17.3°C (+0.6°C) Average mean: 12.3°C (-0.2°C) Average min: 7.3°C (-1.0°C) Max high: 26.4°C (2nd) Max low: 13.4°C (2nd) Min high: 12.4°C (15th) Min low: 1.3°C (30th) Precipitation: 67.2mm (195.9% of avg. precip) Precip days: 13 Precip days (>1mm): 7 Sun hours: 145.0hrs (99.9% of avg sun) Highest wind gust: 83km/h from the NNE (25th) Short summary: Very good May overall, got close to both minimum and maximum records with above average rainfall and average sunshine. Higher diurnals than normal as well. Fun fact: Coldest May morning in 72 years was recorded in the CBD, with 1.7°C on the 30th.  PWS: 
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Post by Deleted on Jun 1, 2021 6:03:33 GMT -5
A very cool, wet and cloudy month. Between 1-26 May, only one day was warmer than average! 2021  Averages  |
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Post by Cadeau on Jun 1, 2021 6:06:15 GMT -5
Paris, Île-de-France, France May 2021 Average: High 18.1°C / Low 9.3°C / Mean 13.7°CHighest: 28.1°C [9th] Lowest: 5.4°C [7th] Lowest High: 10.9°C [6th] Highest Low: 14.5°C [31st] Precipitation: 64.3 mmPrecipitation Days: 13 Sunshine Hours: 198.1 hours Sunshine Percentage: 41.8% Early May: High 17.2°C / Low 8.2°C / Mean 12.7°C / Precipitation 15.3 mm / 55.4 sunshine hours Mid May: High 16.7°C / Low 9.1°C / Mean 12.9°C / Precipitation 29.9 mm / 48.0 sunshine hours Late May: High 20.1°C / Low 10.6°C / Mean 15.4°C / Precipitation 19.1 mm / 94.7 sunshine hours  - Torcy, Île-de-France, France May 2021 Average: High 17.5°C / Low 8.1°C / Mean 12.8°CHighest: 26.9°C [9th] Lowest: 1.8°C [3rd] Lowest High: 11.1°C [1st] Highest Low: 12.7°C [9th,10th] Precipitation: 71.8 mmPrecipitation Days: 16 Early May: High 16.7°C / Low 7.1°C / Mean 11.9°C / Precipitation 22.8 mm Mid May: High 16.5°C / Low 8.4°C / Mean 12.4°C / Precipitation 27.4 mm Late May: High 19.2°C / Low 8.7°C / Mean 13.9°C / Precipitation 21.6 mm  - Seoul, South Korea May 2021 Average: High 21.9°C / Low 12.8°C / Mean 17.1°CHighest: 30.8°C [14th] Lowest: 7.3°C [2nd] Lowest High: 14.6°C [10th] Highest Low: 20.8°C [15th] Precipitation: 183.1 mmPrecipitation Days: 16 Snowfall: 0.0 cm Snowy Days: 0 Average Relative Humidity: 68.1% Average Wind Speed: 8.6 km/h Sunshine Hours: 203.7 hours Sunshine Percentage: 46.3% Early May: High 18.6°C / Low 9.5°C / Mean 13.8°C / Precipitation 38.2 mm / 73.5 sunshine hours Mid May: High 25.1°C / Low 15.2°C / Mean 20.0°C / Precipitation 85.9 mm / 69.9 sunshine hours Late May: High 22.0°C / Low 13.5°C / Mean 17.4°C / Precipitation 59.0 mm / 60.3 sunshine hours  *Note: 7th wettest May since records began in 1908. (7th of 114 years)| Rank | Precipitation | Year | | 1st | 291.3mm | 1997 | | 2nd | 255.2mm | 1969 | | 3rd | 239.8mm | 1974 | | 4th | 222.0mm | 2018 | | 5th | 187.5mm | 1925 | | 6th | 186.7mm | 1963 | | 7th | 183.1mm | 2021 |
- Tokyo, Tokyo, Japan May 2021 Average: High 24.1°C / Low 15.7°C / Mean 19.6°CHighest: 28.9°C [25th] Lowest: 10.9°C [4th] Lowest High: 18.2°C [13th] Highest Low: 19.8°C [17th] Precipitation: 99.5 mmPrecipitation Days: 17 Snowfall: 0 cm Snowy Days: 0 Average Relative Humidity: 73% Average Wind Speed: 3.2 m/s(11.5 km/h) Sunshine Hours: 150.5 hours Sunshine Percentage: 35% Early May: High 24.0°C / Low 13.9°C / Mean 18.5°C / Precipitation 17.5 mm / 69.7 sunshine hours Mid May: High 22.4°C / Low 16.5°C / Mean 19.3°C / Precipitation 26.0 mm / 23.1 sunshine hours Late May: High 25.8°C / Low 16.6°C / Mean 20.8°C / Precipitation 56.0 mm / 57.7 sunshine hours  |
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Post by Speagles84 on Jun 1, 2021 6:37:09 GMT -5
May 2021 - Speagles84 House Cool, dry-then wet, lack of any continual heat.   Spring 2021 Daily Averages  |
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Post by Cadeau on Jun 1, 2021 7:09:51 GMT -5
Copenhagen, Denmark May 2021  - Montréal, Québec, Canada May 2021  - Boston, MA, United States May 2021  - New York City, NY, United States May 2021  - Chicago, IL, United States May 2021  - Seattle, WA, United States May 2021  |
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Post by Ariete on Jun 1, 2021 8:19:33 GMT -5
May ended up average after all, but this time it doesn't tell the full story. The first week of the month was the coldest since 1997, followed by the only warm spell after that. After the 14th only one day managed to reach 20C (30th). The period between the 15th and 29th was actually worse than the averages would suggest. When clouds broke for a couple of hours in the afternoon, the temps rose to normal levels for a while, but most of the day was well below the high recorded that day. The month was also the wettest since 2003. Helsinki recorded 231 sunshine hours and Utö 221, so Turku had most likely something in the same fashion. Helsinki had its 2nd cloudiest May this century.
Highest high: 27.2C (13th) Highest low: 11.8C (13th) Lowest high: 6.6C (7th) Lowest low: -3.3C (2nd)
Mean temp per decade:
1st: 5.9C 2nd: 13.6C 3rd: 11.4C
Deviations from 91-10:
High: -0.3C Mean: -0.1C Low: 0.0C Precipitation: +203% (36.1mm)
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Post by FrozenI69 on Jun 1, 2021 9:26:04 GMT -5
May surprisingly ended up below average, even though we had a week of proper summer weather. That's the effect of the crummery weekend.  |
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