Korkki Road
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Korkki Road clear sky chart from 2005-11-06 to 2024-11-06.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	14% 9% 3 7% 5% 4 5% 4 6% 7% 37%	102142
	Night	14% 10% 3 7% 5% 4 4 4 5% 6% 38%	97058
Transparency	Day	25% 47% 9% 13% 5%	105635
	Night	26% 47% 8% 14% 6% 1	101653
Seeing	Day	16% 9% 29% 30% 13% 3	16131
	Night	17% 8% 31% 31% 12% 1	26003

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	10% 14% 6% 11% 6% 4 4 3 4 6% 32%	2527
	11th to 20th	Day	6% 12% 5% 12% 10% 8% 6% 5% 7% 7% 22%	2530
	21st to end	Day	7% 16% 9% 13% 7% 6% 5% 4 5% 6% 23%	2888
February	1st to 10th	Day	8% 10% 5% 11% 6% 5% 5% 4 5% 7% 34%	1710
	11th to 20th	Day	10% 11% 4 8% 4 4 5% 3 5% 7% 38%	1664
	21st to end	Day	7% 13% 4 8% 6% 4 5% 4 5% 7% 35%	1503
March	1st to 10th	Day	12% 9% 3 8% 5% 5% 5% 4 4 6% 40%	3200
	11th to 20th	Day	8% 11% 3 8% 6% 4 4 4 6% 7% 38%	3480
	21st to end	Day	19% 12% 4 10% 4 4 4 4 5% 6% 29%	3967
April	1st to 10th	Day	16% 11% 4 9% 6% 5% 5% 3 5% 6% 32%	2280
	11th to 20th	Day	18% 10% 3 9% 4 4 5% 4 5% 6% 31%	2254
	21st to end	Day	21% 10% 3 7% 5% 4 4 4 5% 6% 31%	2494
May	1st to 10th	Day	20% 8% 3 6% 5% 3 4 3 4 6% 40%	4428
	11th to 20th	Day	16% 7% 2 5% 5% 4 4 4 5% 7% 41%	4399
	21st to end	Day	19% 8% 3 8% 5% 4 4 3 6% 7% 34%	4837
June	1st to 10th	Day	11% 5% 2 5% 4 4 5% 4 7% 9% 43%	2660
	11th to 20th	Day	15% 6% 2 6% 5% 4 5% 3 6% 8% 39%	2736
	21st to end	Day	14% 6% 2 5% 5% 5% 6% 5% 8% 9% 35%	2850
July	1st to 10th	Day	10% 5% 2 5% 4 5% 6% 5% 8% 10% 41%	4626
	11th to 20th	Day	7% 4 1 5% 4 4 5% 4 6% 10% 51%	4440
	21st to end	Day	7% 4 2 5% 3 4 5% 4 7% 10% 50%	4814
August	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 5% 7% 9% 42%	4343
	11th to 20th	Day	14% 4 2 5% 4 4 4 4 6% 8% 47%	4041
	21st to end	Day	16% 6% 2 6% 4 3 4 3 5% 8% 41%	4286
September	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 6% 8% 47%	2280
	11th to 20th	Day	15% 5% 2 6% 5% 4 4 4 5% 7% 42%	2280
	21st to end	Day	16% 7% 3 6% 4 4 3 3 5% 6% 41%	2003
October	1st to 10th	Day	17% 7% 3 7% 5% 4 6% 4 6% 6% 35%	1900
	11th to 20th	Day	16% 11% 4 7% 4 4 4 3 6% 7% 33%	1900
	21st to end	Day	20% 10% 3 8% 5% 4 4 3 5% 5% 31%	1952
November	1st to 10th	Day	15% 11% 3 8% 6% 5% 5% 3 5% 7% 32%	1613
	11th to 20th	Day	14% 14% 6% 10% 7% 5% 5% 3 5% 4 27%	1520
	21st to end	Day	13% 12% 5% 9% 6% 4 5% 4 5% 8% 29%	1520
December	1st to 10th	Day	12% 13% 4 9% 7% 6% 5% 3 6% 8% 26%	1520
	11th to 20th	Day	14% 18% 6% 10% 7% 5% 5% 4 5% 5% 23%	1914
	21st to end	Day	26% 21% 5% 8% 5% 3 2 2 3 3 22%	2783
January	1st to 10th	Night	11% 13% 6% 9% 4 4 5% 3 5% 6% 34%	4428
	11th to 20th	Night	7% 11% 5% 13% 9% 7% 6% 4 6% 6% 26%	4440
	21st to end	Night	8% 20% 8% 12% 5% 4 4 3 4 5% 27%	4774
February	1st to 10th	Night	7% 12% 4 10% 6% 4 4 5% 5% 6% 37%	2470
	11th to 20th	Night	7% 10% 3 8% 4 5% 4 4 5% 7% 42%	2403
	21st to end	Night	10% 12% 3 9% 4 4 3 4 6% 6% 37%	1951
March	1st to 10th	Night	8% 9% 3 8% 5% 4 5% 3 5% 7% 44%	3669
	11th to 20th	Night	9% 9% 4 11% 6% 5% 5% 4 5% 7% 35%	3479
	21st to end	Night	22% 14% 4 8% 6% 4 3 2 4 3 30%	3663
April	1st to 10th	Night	15% 13% 3 8% 5% 4 4 3 6% 6% 34%	1900
	11th to 20th	Night	18% 10% 3 7% 5% 4 4 4 5% 6% 35%	1875
	21st to end	Night	20% 10% 2 7% 4 4 4 4 4 6% 35%	1681
May	1st to 10th	Night	20% 7% 2 6% 4 3 4 3 5% 6% 40%	2523
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 5% 6% 44%	2506
	21st to end	Night	19% 8% 2 7% 4 5% 5% 4 6% 6% 33%	2750
June	1st to 10th	Night	14% 6% 1 6% 5% 4 4 3 7% 9% 42%	1520
	11th to 20th	Night	13% 8% 2 5% 4 5% 4 4 7% 7% 41%	1437
	21st to end	Night	12% 7% 2 5% 4 5% 4 4 6% 9% 43%	1330
July	1st to 10th	Night	9% 6% 1 4 3 3 4 4 6% 10% 51%	2338
	11th to 20th	Night	5% 2 1 4 3 3 3 3 6% 8% 61%	2530
	21st to end	Night	8% 5% 1 4 3 3 3 3 6% 8% 56%	2750
August	1st to 10th	Night	11% 3 1 5% 3 4 4 5% 5% 8% 51%	2580
	11th to 20th	Night	14% 5% 2 4 3 3 3 3 6% 8% 50%	2798
	21st to end	Night	22% 6% 2 5% 3 3 3 3 4 7% 42%	3372
September	1st to 10th	Night	9% 5% 2 5% 4 4 4 3 5% 7% 52%	1900
	11th to 20th	Night	12% 5% 2 5% 3 3 4 4 5% 7% 50%	1900
	21st to end	Night	15% 6% 2 5% 4 4 4 3 5% 6% 44%	2154
October	1st to 10th	Night	17% 5% 2 7% 4 5% 3 3 5% 6% 43%	2280
	11th to 20th	Night	16% 8% 3 6% 5% 4 4 4 5% 7% 37%	2280
	21st to end	Night	20% 8% 3 7% 5% 4 4 4 5% 7% 33%	2646
November	1st to 10th	Night	14% 9% 3 6% 4 6% 5% 5% 6% 7% 35%	2584
	11th to 20th	Night	16% 12% 3 7% 5% 5% 5% 3 6% 7% 31%	2660
	21st to end	Night	14% 10% 3 7% 4 5% 5% 5% 6% 6% 36%	2660
December	1st to 10th	Night	11% 14% 5% 10% 6% 5% 5% 4 6% 6% 28%	2660
	11th to 20th	Night	11% 16% 5% 9% 6% 5% 5% 4 6% 6% 27%	3283
	21st to end	Night	26% 21% 4 7% 3 3 2 2 3 4 25%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	37% 38% 9% 11% 5%	2528
	11th to 20th	Day	39% 40% 6% 13% 2	2530
	21st to end	Day	40% 44% 6% 8% 2	2888
February	1st to 10th	Day	19% 66% 4 8% 3 1	1710
	11th to 20th	Day	17% 64% 5% 10% 5%	1673
	21st to end	Day	17% 65% 4 7% 7%	1503
March	1st to 10th	Day	25% 42% 6% 18% 8% 2	3202
	11th to 20th	Day	27% 42% 9% 11% 10%	3480
	21st to end	Day	32% 42% 7% 14% 3 1	3967
April	1st to 10th	Day	20% 66% 3 6% 4 1	2280
	11th to 20th	Day	18% 66% 4 8% 4 1	2254
	21st to end	Day	19% 65% 3 9% 4	2494
May	1st to 10th	Day	26% 41% 8% 14% 10% 1	4440
	11th to 20th	Day	26% 42% 9% 16% 5% 1	4403
	21st to end	Day	31% 43% 8% 11% 7%	4837
June	1st to 10th	Day	12% 66% 7% 9% 5%	2660
	11th to 20th	Day	17% 66% 6% 8% 4	2736
	21st to end	Day	18% 64% 6% 9% 2	2850
July	1st to 10th	Day	25% 37% 17% 13% 7%	4556
	11th to 20th	Day	18% 37% 12% 26% 6%	4365
	21st to end	Day	19% 35% 12% 24% 9% 1	4662
August	1st to 10th	Day	25% 37% 13% 16% 8%	4328
	11th to 20th	Day	23% 38% 16% 21% 3	4080
	21st to end	Day	31% 38% 12% 14% 4	4285
September	1st to 10th	Day	16% 61% 8% 12% 4	2280
	11th to 20th	Day	18% 61% 9% 10% 2	2280
	21st to end	Day	20% 60% 7% 10% 4	2003
October	1st to 10th	Day	22% 37% 13% 20% 8% 1	3160
	11th to 20th	Day	24% 37% 7% 22% 11%	3140
	21st to end	Day	34% 36% 12% 14% 4	3190
November	1st to 10th	Day	26% 57% 4 10% 3	1613
	11th to 20th	Day	25% 60% 5% 7% 4	1520
	21st to end	Day	26% 59% 4 6% 4 1	1520
December	1st to 10th	Day	23% 60% 5% 9% 3	1520
	11th to 20th	Day	33% 49% 6% 8% 3 1	1915
	21st to end	Day	45% 39% 3 9% 4	2783
January	1st to 10th	Night	35% 39% 10% 12% 4	4428
	11th to 20th	Night	37% 39% 12% 10% 2	4440
	21st to end	Night	40% 41% 8% 10% 1	4774
February	1st to 10th	Night	17% 65% 5% 8% 4	2470
	11th to 20th	Night	16% 64% 5% 11% 4	2404
	21st to end	Night	16% 65% 4 9% 6% 1	1951
March	1st to 10th	Night	21% 42% 8% 13% 13% 2	3680
	11th to 20th	Night	32% 42% 7% 13% 6%	3480
	21st to end	Night	39% 40% 3 9% 7% 1	3663
April	1st to 10th	Night	18% 65% 4 8% 5%	1900
	11th to 20th	Night	18% 66% 3 8% 4 1	1875
	21st to end	Night	17% 65% 2 10% 5%	1681
May	1st to 10th	Night	26% 42% 9% 17% 6%	2530
	11th to 20th	Night	23% 43% 7% 15% 11% 2	2507
	21st to end	Night	32% 44% 7% 11% 6% 1	2751
June	1st to 10th	Night	13% 65% 6% 9% 6% 1	1520
	11th to 20th	Night	17% 66% 5% 6% 6%	1437
	21st to end	Night	15% 63% 6% 14% 2 1	1330
July	1st to 10th	Night	22% 38% 16% 15% 8%	2300
	11th to 20th	Night	12% 36% 11% 35% 6% 1	2482
	21st to end	Night	17% 36% 8% 28% 10% 1	2662
August	1st to 10th	Night	23% 37% 12% 15% 12% 1	2571
	11th to 20th	Night	23% 37% 11% 25% 3	2825
	21st to end	Night	34% 37% 11% 15% 3	3372
September	1st to 10th	Night	15% 60% 9% 12% 3 1	1900
	11th to 20th	Night	14% 60% 11% 11% 3	1900
	21st to end	Night	20% 60% 6% 11% 4	2154
October	1st to 10th	Night	16% 36% 6% 25% 15% 2	3800
	11th to 20th	Night	25% 37% 6% 20% 12%	3779
	21st to end	Night	36% 37% 9% 13% 6%	4358
November	1st to 10th	Night	22% 58% 6% 11% 3	2584
	11th to 20th	Night	20% 60% 9% 7% 4	2660
	21st to end	Night	22% 60% 8% 7% 4	2660
December	1st to 10th	Night	22% 60% 6% 10% 2	2660
	11th to 20th	Night	28% 51% 5% 12% 3	3281
	21st to end	Night	43% 39% 4 12% 2	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	15% 10% 35% 29% 10% 1	270
	11th to 20th	Day	16% 7% 37% 30% 10%	270
	21st to end	Day	12% 10% 33% 33% 10% 1	297
February	1st to 10th	Day	13% 12% 43% 25% 6% 1	270
	11th to 20th	Day	12% 18% 42% 19% 8% 1	270
	21st to end	Day	15% 13% 42% 28% 1	225
March	1st to 10th	Day	15% 11% 31% 34% 7% 1	270
	11th to 20th	Day	14% 9% 40% 26% 9% 1	270
	21st to end	Day	23% 10% 32% 26% 8% 2	386
April	1st to 10th	Day	21% 14% 32% 26% 6% 1	460
	11th to 20th	Day	24% 10% 25% 29% 10% 1	452
	21st to end	Day	24% 9% 28% 26% 11% 1	631
May	1st to 10th	Day	21% 11% 34% 26% 6% 2	653
	11th to 20th	Day	18% 8% 30% 29% 13% 3	675
	21st to end	Day	19% 7% 26% 31% 14% 3	734
June	1st to 10th	Day	11% 8% 31% 35% 13% 3	680
	11th to 20th	Day	15% 9% 29% 34% 11% 1	680
	21st to end	Day	14% 7% 28% 33% 17% 3	680
July	1st to 10th	Day	9% 4 22% 37% 22% 6%	671
	11th to 20th	Day	9% 6% 27% 31% 21% 7%	668
	21st to end	Day	6% 4 23% 39% 20% 6%	739
August	1st to 10th	Day	11% 5% 23% 38% 20% 4	676
	11th to 20th	Day	13% 5% 19% 33% 25% 4	665
	21st to end	Day	18% 6% 20% 32% 21% 4	606
September	1st to 10th	Day	10% 6% 27% 37% 19% 2	490
	11th to 20th	Day	16% 7% 25% 31% 19% 3	490
	21st to end	Day	21% 9% 28% 24% 14% 4	361
October	1st to 10th	Day	19% 9% 30% 27% 12% 2	300
	11th to 20th	Day	17% 16% 35% 26% 5% 1	300
	21st to end	Day	25% 13% 36% 22% 3	330
November	1st to 10th	Day	21% 12% 34% 23% 10%	285
	11th to 20th	Day	20% 13% 38% 22% 6%	270
	21st to end	Day	19% 15% 33% 27% 7%	270
December	1st to 10th	Day	16% 16% 34% 26% 7% 1	270
	11th to 20th	Day	20% 15% 38% 20% 6%	270
	21st to end	Day	28% 11% 32% 24% 4	297
January	1st to 10th	Night	14% 10% 37% 30% 7% 1	950
	11th to 20th	Night	16% 7% 42% 25% 8% 1	950
	21st to end	Night	16% 9% 40% 27% 7% 1	1045
February	1st to 10th	Night	12% 10% 40% 31% 7% 1	950
	11th to 20th	Night	12% 10% 40% 26% 10% 1	929
	21st to end	Night	17% 9% 37% 30% 8%	695
March	1st to 10th	Night	15% 8% 35% 34% 8% 1	733
	11th to 20th	Night	17% 8% 36% 29% 9% 1	570
	21st to end	Night	22% 6% 29% 27% 12% 3	627
April	1st to 10th	Night	20% 8% 36% 28% 8%	570
	11th to 20th	Night	23% 9% 26% 31% 10% 1	563
	21st to end	Night	24% 6% 25% 30% 12% 2	570
May	1st to 10th	Night	18% 7% 32% 31% 10% 1	570
	11th to 20th	Night	20% 6% 23% 36% 14% 2	561
	21st to end	Night	18% 6% 19% 38% 19%	617
June	1st to 10th	Night	16% 4 24% 39% 16% 1	570
	11th to 20th	Night	17% 4 22% 45% 13% 1	570
	21st to end	Night	16% 4 19% 40% 20% 2	570
July	1st to 10th	Night	7% 2 19% 39% 30% 3	555
	11th to 20th	Night	9% 1 26% 36% 26% 2	552
	21st to end	Night	8% 1 21% 42% 25% 3	624
August	1st to 10th	Night	9% 3 22% 40% 25% 1	567
	11th to 20th	Night	15% 3 18% 35% 25% 4	564
	21st to end	Night	18% 4 18% 35% 23% 3	627
September	1st to 10th	Night	11% 5% 23% 37% 21% 3	570
	11th to 20th	Night	14% 4 21% 38% 21% 2	570
	21st to end	Night	20% 6% 27% 27% 18% 2	698
October	1st to 10th	Night	19% 8% 29% 30% 14% 1	760
	11th to 20th	Night	19% 10% 35% 27% 8% 1	760
	21st to end	Night	23% 11% 31% 27% 7%	836
November	1st to 10th	Night	18% 12% 33% 29% 8%	865
	11th to 20th	Night	19% 14% 33% 24% 9% 1	950
	21st to end	Night	18% 15% 35% 26% 6%	950
December	1st to 10th	Night	18% 13% 35% 27% 6%	950
	11th to 20th	Night	21% 11% 36% 23% 8% 1	950
	21st to end	Night	29% 10% 34% 21% 5% 1	1045

Page generated at 2024-11-03 12:19:03. Version ac07

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