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Post by Deleted on May 4, 2020 5:54:02 GMT -5
The summer index has been around since the 1960s, and seems a favourite of the Netweather forum as it can be used to rank summers as a whole, rather than by temperature, sunshine, rainfall individually.
The Summer index is 10 x [(mean max of summer) +(total sunshine)/67 - (rain days/8)]
Is this used outside of the UK at all?
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Post by alex992 on May 4, 2020 7:57:12 GMT -5
By mean max, is it June-August avg high / three or average highest temp?
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Post by Deleted on May 4, 2020 7:59:29 GMT -5
By mean max, is it June-August avg high / three or average highest temp? Average max over the June-August period. Eg 22c, 23c, 23c, would be a mean max of 22.7c. |
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Post by alex992 on May 4, 2020 8:08:51 GMT -5
Ok, gotcha.
89.9 F (32.2 C) + 91.2 F (32.9 C) + 91.3 F (33.0 C) = 272.4 / 3 = 90.8 F (32.7 C)
10 X [(32.7) + (885.8/67) - (52.2/8)]
10 x [32.7 + 13.22 - 6.525]
10 x [39.395] = 393.95
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Post by Crunch41 on May 4, 2020 12:27:50 GMT -5
I have never heard of this index.
Summer highs (24.1+26.7+25.8)/3 =25.53
Sunshine 304.5+321.1+281.2 = 906.8
Rain 10.4+9.8+9.5 = 29.7
10* (25.5 + 906.8/67 - 29.7/8) = 255+135.3-37.1 = 353.2
1C hotter summers adds 10
100 extra sunshine hours adds 14.9
10 extra rainy days subtracts 12.5
Seems a bit too focused on temps.
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Post by Steelernation on May 4, 2020 14:45:25 GMT -5
Temps: (24.8 + 27.2 + 26.2)/3 = 26.1
Sunshine: (297.6 + 314.4 + 273.4)/67 = 13.2
Rain days: (9.0 + 8.8 + 8.3)/8 = 3.3
Total: 10 x (26.1 + 13.2 -3.3) = 360
360
imo rain days should be the biggest factor. I like how it ignores low temps though.
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Post by Ariete on May 4, 2020 15:53:24 GMT -5
What would be the thresholds between summer and crummer?
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Post by Deleted on May 4, 2020 16:15:05 GMT -5
Summer 2018: 344
Average summer: 289
'Summer' 2012: 233
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Post by Steelernation on May 4, 2020 16:34:04 GMT -5
Fort Collins is
Temps: (26.9 + 30.3 + 28.9)/3 = 28.7
Sunshine: (315.3 +325.0 + 306.4)/67 = 14.1
Rain days: (6.6 + 5.5 + 5.5)/8 = 2.2
Total: 10 x (28.7 + 14.1 - 2.2) = 406
Apparently Fort Collins is more summery than Miami...that doesn’t seem right.
If this is supposed to rain the “best” summers that might make sense, but the formula would be the highest for like Death Valley. Not something most people would enjoy.
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Post by knot on May 4, 2020 17:44:06 GMT -5
Summer Maxima: (23.5 + 23.3 + 22.0) / 3 = 22.9
Sunshine: (288.3 + 251.4 + 282.1) / 67 = 12.3
Precipitation Days: (6.1 + 5.7 + 7.3) / 8 = 2.4
Summer Index (Original): 10 x (22.9 + 12.3 – 2.4) = 328
Summer Index (Latitude) = 328 – 36 = 292
Honestly, I do think latitude should play a vital role here; sunshine hours are fraudulent, and give extra "summer" points to the Scandinavian/Northern European botevs who have very weak UV indices and suicidally long days in their crummers.
I reckon it would be good to subtract the latitude after the total number: for e.g. London scored 289 on the summer index, so 289 – 52 = 237; for me, it's 328 – 36 = 292. Therefore, London is 237 vs 292 for me.
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Post by Crunch41 on May 4, 2020 18:03:32 GMT -5
Edited to add Angler's latitude formula
Vostok. November-January since November is warmer than February. Summer maxima (November - January): -30.4 Sunshine: 2087.5/67 = 31.15 Rainy days - By the 1mm limit, zero. The wettest month is January with 1.0mm: Zero: 0 Summer index: 10x (-30.4 + 31.2 - 0) = 8
With latitude: 8 -78 = -70
Vostok sunshine hours are incredibly high. Much higher than the south pole, which should have a similar amount of sunshine.
Grytviken Summer maxima: 8.3 Sunshine: 479/67=7.1 Rainy days: 36/8 = 4.5 Summer index: 10 x (8.3+7.1-4.5) = 109 Latitude: 109 - 54 = 55
Eureka (Canada) Summer maxima: 6.8 Sunshine: 985.8/67 = 14.7 Rainy days: 21.1/8 = 2.6 Summer index: 10 x (6.8 +14.7 - 2.6) = 189Latitude: 189 - 80 = 109
Quibdó (Colombia) Summer maxima: 31.1 Sunshine: 381.8/67 = 5.7 Rainy days: 79/8 = 9.9 Summer index: 10 x (31.1 + 5.7 - 9.9) = 269 Latitude: 269 - 6 = 263
Orcadas (Antarctica) Summer maxima: 3.3 Sunshine: 148.6/67 = 2.2 Rainy days: 56/8 = 7 Summer index: 10 x (3.3+2.2-7.0) = -15  Latitude: -15 - 61 = -76
Kuwait City Summer maxima: 46.4 Sunshine: 913.2/67 = 13.6 Rainy days: 0 Summer index: 10 x (46.4 + 13.6 - 0) = 600
Latitude: 600 - 29 = 581
Turpan (China)
Summer maxima: 38.5 Sunshine: 918.8/67 = 13.7 Rainy days: 6.2/8 = 0.8 Summer index: 10 x (38.5 + 13.7 - 0.8) = 514 Latitude: 514 - 43 = 471
Redding (USA)
Summer maxima: 35.0 Sunshine: 1295/67 = 19.3 (Likely higher than the true number)
Rainy days: 5.5/8 = 0.7 Summer index: 10 x (35.0 + 19.3 - 0.7) = 536 Latitude: 536 - 41 = 495
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Post by omegaraptor on May 4, 2020 22:12:28 GMT -5
Portland mean high temp is 25.8 using June (although Sept is warmer than June)
Sunshine hours: 920.2/67 = 13.73
Rain days: (9.2+4.1+3.9)/8 = 2.15
(25.8 + 13.73 - 2.15) * 10 = 373.80
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Post by Morningrise on May 5, 2020 11:38:45 GMT -5
Summer high: (22.6 + 25.7 + 25.2) / 3 = 24.5 Sunshine: (266.8 + 308.8 + 269.6) / 67 = 12.6 Precipitation days: (12.2 + 10.5 + 9.5) / 8 = 4.0 10 x (24.5 + 12.6 - 4.0) = 331Using AA's latitude formula I get 279. However I prefer long days in the summer (in fact, that's one of the defining features of summer for me) and I'm not a fan of high UV indices, so I think I'll reverse it and give myself an extra boost  331 + 52 = 383 |
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Post by Babu on May 5, 2020 17:46:12 GMT -5
For 2002-2018 (1997-2019 for rainy days), Umeå gets:
Average high: (18.0+21.4+19.8)÷3 = 19.7
Sunshine: (285+288+224)÷67 = 11.9
Rainy days (≥1mm): (8+8+9)÷8 = 3.1
Summer index = 10(19.7+11.9-3.1) = 285
So almost identical to London's 1981-2010 summer index. Which is pretty absurd. It should definitely use sunshine percentage instead of sunshine hours. The difference in cloudiness between London and Umeå definitely isn't enough to weigh up against their much warmer weather.
I also think lows should matter too, but with half as much weight as the highs.
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Post by knot on May 5, 2020 17:56:33 GMT -5
For 2002-2018 (1997-2019 for rainy days), Umeå gets: Average high: (18.0+21.4+19.8)÷3 = 19.7 Sunshine: (285+288+224)÷67 = 11.9 Rainy days (≥1mm): (8+8+9)÷8 = 3.1 Summer index = 10(19.7+11.9-3.1) = 285 – 64 = 221*So almost identical to London's 1981-2010 summer index. Which is pretty absurd. It should definitely use sunshine percentage instead of sunshine hours. The difference in cloudiness between London and Umeå definitely isn't enough to weigh up against their much warmer weather. I also think lows should matter too, but with half as much weight as the highs. Also, 2002–2018 is weather, not "climate". |
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Post by Babu on May 5, 2020 18:12:01 GMT -5
For 2002-2018 (1997-2019 for rainy days), Umeå gets: Average high: (18.0+21.4+19.8)÷3 = 19.7 Sunshine: (285+288+224)÷67 = 11.9 Rainy days (≥1mm): (8+8+9)÷8 = 3.1 Summer index = 10(19.7+11.9-3.1) = 285 – 64 = 221*So almost identical to London's 1981-2010 summer index. Which is pretty absurd. It should definitely use sunshine percentage instead of sunshine hours. The difference in cloudiness between London and Umeå definitely isn't enough to weigh up against their much warmer weather. I also think lows should matter too, but with half as much weight as the highs. Also, 2002–2018 is weather, not "climate". I didn't call it climate. I don't have a 91-19 weatherbox to look at to quickly get those normals, and sunshine data is only available since 2002. |
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Post by knot on May 5, 2020 18:17:00 GMT -5
I didn't call it climate. I don't have a 91-19 weatherbox to look at to quickly get those normals, and sunshine data is only available since 2002. Fair enough. |
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Post by Babu on May 5, 2020 18:30:27 GMT -5
Stockholm 2018:
10((23.1+28.5+24.0)÷3+(319+390+253)÷67-(7+1+11)÷8)=372
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Post by AJ1013 on May 5, 2020 18:38:32 GMT -5
My 2 cents is that it’s silly to count precip against summer. To me warm thunderstorms are the essence of summer.
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Post by knot on May 5, 2020 19:15:11 GMT -5
My 2 cents is that it’s silly to count precip against summer. To me warm thunderstorms are the essence of summer. Precipitation days, not precipitation total. Big difference! Frequent rain/cloudy skies are not very summery, at all. However, a few heavy downpours are defo summery. This is really a summer warmth index: it'll feel warmer with sunshine as opposed to cloud/rain. |
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331 + 52 = 383 
