Ogoki
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Ogoki clear sky chart from 2005-11-06 to 2024-02-05.

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	16% 11% 4 8% 7% 4 6% 5% 6% 6% 26%	77884
	Night	14% 12% 5% 9% 8% 4 6% 6% 5% 6% 23%	80982
Transparency	Day	58% 6% 12% 18% 7%	77573
	Night	60% 6% 11% 17% 6%	80827
Seeing	Day	20% 12% 30% 25% 10% 2	14561
	Night	20% 9% 30% 29% 11% 1	23994

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	8% 14% 7% 12% 10% 7% 9% 7% 8% 6% 11%	2208
	11th to 20th	Day	7% 11% 6% 15% 13% 7% 8% 8% 7% 6% 12%	2352
	21st to end	Day	15% 16% 8% 14% 9% 5% 6% 7% 5% 4 10%	2783
February	1st to 10th	Day	6% 10% 6% 8% 9% 5% 9% 11% 9% 8% 19%	1472
	11th to 20th	Day	7% 11% 6% 10% 7% 5% 8% 9% 7% 9% 21%	1525
	21st to end	Day	4 10% 6% 10% 10% 7% 9% 7% 6% 7% 24%	1480
March	1st to 10th	Day	10% 9% 4 9% 8% 6% 8% 5% 6% 7% 26%	1798
	11th to 20th	Day	9% 13% 5% 10% 8% 6% 6% 5% 5% 7% 27%	1889
	21st to end	Day	12% 10% 4 7% 7% 5% 7% 5% 5% 6% 31%	2312
April	1st to 10th	Day	12% 13% 5% 9% 8% 5% 5% 5% 5% 7% 27%	2160
	11th to 20th	Day	18% 11% 3 7% 6% 4 5% 4 5% 5% 32%	2302
	21st to end	Day	16% 11% 4 7% 6% 3 5% 5% 5% 5% 34%	2349
May	1st to 10th	Day	19% 13% 5% 8% 6% 3 5% 4 5% 6% 27%	2520
	11th to 20th	Day	22% 9% 3 6% 6% 3 5% 4 5% 7% 29%	2626
	21st to end	Day	23% 8% 4 6% 6% 3 5% 5% 6% 6% 29%	2919
June	1st to 10th	Day	25% 9% 3 5% 6% 3 4 4 6% 7% 29%	2700
	11th to 20th	Day	15% 7% 3 6% 6% 4 5% 5% 5% 8% 36%	2706
	21st to end	Day	16% 6% 3 7% 6% 4 5% 5% 7% 7% 33%	2880
July	1st to 10th	Day	16% 6% 3 5% 6% 4 5% 6% 6% 8% 35%	2710
	11th to 20th	Day	18% 5% 2 5% 6% 4 5% 6% 6% 8% 35%	2700
	21st to end	Day	17% 6% 3 6% 6% 3 5% 7% 6% 8% 33%	2805
August	1st to 10th	Day	17% 8% 2 6% 6% 4 5% 7% 6% 8% 31%	2507
	11th to 20th	Day	17% 6% 3 7% 6% 4 5% 5% 6% 8% 34%	2417
	21st to end	Day	19% 7% 4 8% 6% 4 4 5% 6% 7% 31%	2574
September	1st to 10th	Day	19% 8% 3 7% 5% 4 4 5% 5% 6% 33%	2167
	11th to 20th	Day	25% 10% 3 6% 6% 4 5% 4 4 6% 27%	2016
	21st to end	Day	24% 13% 3 6% 5% 3 4 3 4 6% 28%	1980
October	1st to 10th	Day	22% 15% 5% 7% 6% 4 5% 4 5% 6% 22%	1901
	11th to 20th	Day	23% 20% 5% 7% 6% 4 4 4 4 4 18%	1620
	21st to end	Day	21% 22% 4 9% 7% 4 5% 4 5% 4 15%	1782
November	1st to 10th	Day	21% 17% 8% 11% 6% 3 4 4 3 6% 15%	1622
	11th to 20th	Day	18% 20% 7% 13% 10% 4 4 5% 3 3 13%	1340
	21st to end	Day	19% 20% 9% 15% 9% 4 4 4 2 3 10%	1330
December	1st to 10th	Day	10% 17% 8% 14% 11% 4 7% 5% 5% 5% 15%	1330
	11th to 20th	Day	10% 15% 6% 9% 8% 7% 10% 6% 7% 8% 14%	1671
	21st to end	Day	10% 17% 7% 13% 11% 7% 7% 5% 5% 4 12%	2431
January	1st to 10th	Night	8% 14% 6% 12% 12% 7% 9% 8% 6% 6% 12%	4748
	11th to 20th	Night	7% 12% 6% 14% 15% 7% 10% 10% 7% 5% 9%	4601
	21st to end	Night	11% 18% 8% 12% 8% 5% 7% 7% 6% 5% 12%	4884
February	1st to 10th	Night	5% 9% 6% 9% 9% 7% 13% 9% 7% 6% 20%	2583
	11th to 20th	Night	7% 13% 6% 10% 8% 6% 9% 8% 8% 8% 18%	2321
	21st to end	Night	5% 10% 5% 11% 9% 5% 8% 9% 7% 8% 22%	1776
March	1st to 10th	Night	9% 8% 5% 9% 10% 5% 8% 6% 6% 7% 28%	2149
	11th to 20th	Night	10% 13% 5% 10% 9% 4 5% 5% 5% 6% 29%	2069
	21st to end	Night	12% 11% 3 8% 7% 3 5% 5% 5% 5% 36%	2059
April	1st to 10th	Night	16% 14% 5% 8% 7% 4 6% 4 4 4 29%	1800
	11th to 20th	Night	16% 11% 5% 7% 6% 4 4 5% 4 6% 31%	1607
	21st to end	Night	15% 11% 4 6% 6% 3 4 4 3 6% 38%	1607
May	1st to 10th	Night	17% 10% 4 8% 5% 3 5% 5% 5% 7% 31%	1440
	11th to 20th	Night	19% 9% 3 6% 6% 3 4 6% 6% 7% 32%	1267
	21st to end	Night	22% 7% 4 6% 5% 3 5% 5% 5% 7% 31%	1357
June	1st to 10th	Night	21% 8% 4 7% 5% 3 4 5% 5% 7% 33%	1260
	11th to 20th	Night	16% 6% 3 5% 5% 3 5% 5% 6% 8% 38%	1243
	21st to end	Night	16% 5% 3 6% 7% 3 6% 5% 6% 7% 35%	1080
July	1st to 10th	Night	17% 7% 3 5% 5% 3 6% 5% 6% 8% 35%	1242
	11th to 20th	Night	12% 6% 2 4 6% 4 7% 6% 7% 8% 38%	1260
	21st to end	Night	15% 5% 2 5% 6% 2 5% 5% 7% 9% 40%	1511
August	1st to 10th	Night	15% 6% 3 4 5% 3 6% 5% 5% 9% 38%	1432
	11th to 20th	Night	14% 6% 3 5% 6% 4 3 5% 7% 8% 40%	1484
	21st to end	Night	16% 6% 3 6% 7% 3 5% 5% 5% 8% 37%	1782
September	1st to 10th	Night	18% 7% 1 5% 5% 3 4 4 5% 6% 41%	1790
	11th to 20th	Night	22% 8% 3 6% 6% 3 4 4 6% 6% 32%	1926
	21st to end	Night	22% 10% 2 5% 5% 3 4 4 4 7% 35%	1980
October	1st to 10th	Night	24% 14% 3 5% 5% 2 3 4 5% 7% 27%	2057
	11th to 20th	Night	22% 18% 5% 8% 6% 3 5% 5% 4 7% 18%	2340
	21st to end	Night	19% 18% 6% 10% 7% 4 5% 4 4 5% 18%	2574
November	1st to 10th	Night	22% 18% 7% 11% 6% 3 5% 4 4 5% 15%	2455
	11th to 20th	Night	20% 19% 7% 12% 7% 4 4 4 4 4 15%	2836
	21st to end	Night	16% 20% 8% 15% 9% 4 5% 4 3 4 13%	2850
December	1st to 10th	Night	11% 16% 9% 13% 12% 6% 6% 6% 4 5% 13%	2850
	11th to 20th	Night	10% 15% 7% 11% 9% 5% 7% 7% 5% 5% 18%	3526
	21st to end	Night	13% 14% 6% 12% 10% 5% 6% 6% 5% 6% 18%	5236

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	69% 5% 14% 10% 2	2209
	11th to 20th	Day	70% 4 10% 13% 2	2352
	21st to end	Day	77% 4 5% 10% 4	2783
February	1st to 10th	Day	56% 7% 10% 19% 8%	1472
	11th to 20th	Day	57% 6% 11% 20% 6%	1533
	21st to end	Day	58% 4 12% 15% 11%	1480
March	1st to 10th	Day	56% 6% 9% 19% 11%	1800
	11th to 20th	Day	57% 5% 12% 20% 5% 1	1889
	21st to end	Day	53% 5% 9% 20% 12% 1	2312
April	1st to 10th	Day	57% 5% 9% 19% 10% 1	2160
	11th to 20th	Day	53% 5% 8% 22% 11% 1	2302
	21st to end	Day	52% 5% 9% 19% 14% 2	2349
May	1st to 10th	Day	58% 5% 8% 19% 9% 2	2520
	11th to 20th	Day	54% 6% 8% 19% 12% 1	2630
	21st to end	Day	54% 6% 10% 20% 9% 1	2919
June	1st to 10th	Day	54% 5% 10% 20% 10% 1	2700
	11th to 20th	Day	46% 7% 10% 23% 12% 2	2706
	21st to end	Day	48% 6% 13% 22% 9% 1	2880
July	1st to 10th	Day	44% 7% 13% 27% 8%	2636
	11th to 20th	Day	44% 7% 16% 26% 6%	2619
	21st to end	Day	46% 8% 16% 23% 6%	2649
August	1st to 10th	Day	49% 8% 18% 22% 4	2492
	11th to 20th	Day	46% 7% 18% 21% 7%	2417
	21st to end	Day	52% 6% 18% 19% 4	2574
September	1st to 10th	Day	50% 6% 15% 22% 6% 1	2167
	11th to 20th	Day	57% 6% 16% 16% 4	2016
	21st to end	Day	58% 5% 12% 18% 7%	1980
October	1st to 10th	Day	64% 5% 13% 14% 4	1901
	11th to 20th	Day	69% 5% 12% 12% 1	1620
	21st to end	Day	73% 5% 12% 8% 2	1782
November	1st to 10th	Day	72% 6% 10% 9% 2	1622
	11th to 20th	Day	76% 5% 8% 8% 1	1340
	21st to end	Day	81% 3 6% 7% 3	1330
December	1st to 10th	Day	70% 6% 9% 11% 4	1330
	11th to 20th	Day	66% 5% 10% 16% 3	1671
	21st to end	Day	75% 3 8% 11% 2	2431
January	1st to 10th	Night	71% 5% 13% 9% 2	4748
	11th to 20th	Night	74% 4 11% 9% 2	4601
	21st to end	Night	72% 5% 6% 14% 3	4884
February	1st to 10th	Night	60% 5% 9% 18% 7%	2583
	11th to 20th	Night	59% 6% 10% 18% 6%	2323
	21st to end	Night	56% 7% 12% 18% 8%	1776
March	1st to 10th	Night	54% 6% 10% 20% 9%	2160
	11th to 20th	Night	56% 4 11% 20% 8% 1	2070
	21st to end	Night	50% 4 8% 21% 16% 1	2059
April	1st to 10th	Night	58% 5% 7% 18% 12%	1800
	11th to 20th	Night	53% 4 9% 20% 13% 1	1607
	21st to end	Night	49% 4 7% 21% 17% 2	1607
May	1st to 10th	Night	51% 5% 8% 23% 12% 1	1440
	11th to 20th	Night	49% 7% 10% 19% 15% 1	1268
	21st to end	Night	51% 6% 12% 20% 11% 1	1358
June	1st to 10th	Night	51% 7% 11% 20% 11% 1	1260
	11th to 20th	Night	43% 7% 11% 26% 13% 1	1243
	21st to end	Night	45% 6% 13% 26% 10%	1080
July	1st to 10th	Night	46% 7% 13% 25% 9%	1207
	11th to 20th	Night	39% 9% 16% 28% 8%	1218
	21st to end	Night	40% 7% 19% 28% 6%	1427
August	1st to 10th	Night	43% 8% 19% 26% 4	1423
	11th to 20th	Night	40% 9% 18% 27% 6%	1484
	21st to end	Night	45% 7% 19% 21% 8%	1782
September	1st to 10th	Night	43% 5% 20% 25% 7%	1790
	11th to 20th	Night	52% 7% 19% 19% 3	1926
	21st to end	Night	50% 6% 17% 19% 8%	1980
October	1st to 10th	Night	57% 6% 16% 16% 6%	2057
	11th to 20th	Night	67% 6% 13% 12% 1	2340
	21st to end	Night	69% 6% 11% 12% 1	2574
November	1st to 10th	Night	73% 5% 10% 9% 2 1	2455
	11th to 20th	Night	73% 5% 10% 10% 2	2836
	21st to end	Night	76% 4 8% 10% 2	2850
December	1st to 10th	Night	74% 5% 8% 11% 2	2850
	11th to 20th	Night	66% 6% 8% 14% 6%	3525
	21st to end	Night	67% 4 8% 17% 3	5236

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	11% 14% 37% 27% 10%	180
	11th to 20th	Day	11% 13% 30% 29% 14% 4	222
	21st to end	Day	15% 9% 30% 29% 13% 4	297
February	1st to 10th	Day	11% 10% 33% 36% 9% 2	252
	11th to 20th	Day	10% 15% 41% 23% 8% 3	240
	21st to end	Day	10% 15% 43% 25% 7% 1	198
March	1st to 10th	Day	13% 12% 35% 25% 12% 3	240
	11th to 20th	Day	12% 14% 40% 26% 6% 2	329
	21st to end	Day	14% 10% 33% 30% 10% 4	462
April	1st to 10th	Day	16% 14% 34% 26% 9% 2	420
	11th to 20th	Day	26% 11% 26% 22% 11% 3	412
	21st to end	Day	20% 10% 28% 28% 10% 3	429
May	1st to 10th	Day	23% 14% 30% 23% 7% 3	603
	11th to 20th	Day	24% 13% 31% 22% 8% 3	625
	21st to end	Day	27% 10% 29% 26% 7% 1	679
June	1st to 10th	Day	26% 12% 31% 22% 7% 2	630
	11th to 20th	Day	19% 10% 28% 29% 11% 3	630
	21st to end	Day	19% 10% 29% 27% 12% 3	630
July	1st to 10th	Day	15% 10% 32% 27% 14% 1	621
	11th to 20th	Day	18% 9% 28% 30% 12% 2	618
	21st to end	Day	16% 8% 26% 27% 18% 5%	684
August	1st to 10th	Day	19% 9% 26% 27% 15% 4	626
	11th to 20th	Day	18% 10% 25% 26% 16% 5%	553
	21st to end	Day	22% 8% 27% 29% 9% 5%	495
September	1st to 10th	Day	21% 11% 32% 25% 10% 2	450
	11th to 20th	Day	27% 13% 29% 21% 9% 1	450
	21st to end	Day	30% 9% 26% 22% 12% 2	450
October	1st to 10th	Day	26% 14% 29% 22% 8% 1	405
	11th to 20th	Day	27% 19% 33% 14% 7% 1	270
	21st to end	Day	30% 18% 30% 18% 5%	297
November	1st to 10th	Day	29% 22% 31% 14% 3	246
	11th to 20th	Day	24% 14% 32% 23% 4 2	180
	21st to end	Day	27% 16% 33% 17% 6% 1	180
December	1st to 10th	Day	20% 15% 25% 25% 13% 2	180
	11th to 20th	Day	16% 16% 34% 23% 11% 1	180
	21st to end	Day	16% 12% 28% 31% 9% 5%	198
January	1st to 10th	Night	17% 10% 33% 31% 8% 1	950
	11th to 20th	Night	18% 10% 30% 30% 11% 2	950
	21st to end	Night	16% 6% 32% 30% 13% 3	1045
February	1st to 10th	Night	9% 8% 32% 37% 13% 1	923
	11th to 20th	Night	12% 8% 33% 34% 12% 2	798
	21st to end	Night	10% 7% 30% 33% 17% 3	592
March	1st to 10th	Night	12% 7% 32% 35% 12% 2	720
	11th to 20th	Night	16% 10% 39% 26% 8% 1	720
	21st to end	Night	17% 9% 33% 26% 13% 2	673
April	1st to 10th	Night	21% 10% 33% 26% 10% 1	540
	11th to 20th	Night	22% 8% 30% 27% 11% 2	533
	21st to end	Night	19% 7% 29% 31% 13% 1	540
May	1st to 10th	Night	22% 9% 33% 28% 7% 1	540
	11th to 20th	Night	24% 10% 30% 27% 8% 1	382
	21st to end	Night	25% 9% 33% 28% 4 1	389
June	1st to 10th	Night	24% 11% 29% 24% 11%	360
	11th to 20th	Night	17% 7% 33% 30% 13%	360
	21st to end	Night	15% 9% 31% 35% 10%	360
July	1st to 10th	Night	21% 6% 29% 32% 12%	350
	11th to 20th	Night	12% 6% 34% 39% 8% 1	348
	21st to end	Night	17% 3 25% 37% 17% 2	527
August	1st to 10th	Night	18% 6% 21% 40% 13% 2	537
	11th to 20th	Night	17% 7% 26% 31% 17% 2	534
	21st to end	Night	20% 7% 26% 34% 12% 2	594
September	1st to 10th	Night	20% 6% 27% 34% 11% 1	540
	11th to 20th	Night	26% 9% 33% 24% 9%	666
	21st to end	Night	27% 10% 25% 30% 9%	720
October	1st to 10th	Night	31% 11% 29% 23% 6% 1	720
	11th to 20th	Night	31% 10% 27% 21% 9% 1	720
	21st to end	Night	26% 10% 28% 25% 10% 1	792
November	1st to 10th	Night	31% 12% 30% 21% 6% 1	740
	11th to 20th	Night	30% 12% 27% 22% 8% 1	936
	21st to end	Night	26% 12% 30% 23% 8% 1	950
December	1st to 10th	Night	17% 10% 37% 25% 10% 1	950
	11th to 20th	Night	16% 11% 34% 25% 11% 3	950
	21st to end	Night	22% 8% 28% 25% 11% 5%	1045

Page generated at 2024-02-02 05:20:27. Version ac07

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