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 2024-09-29.

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	15% 11% 4 9% 6% 5% 5% 4 5% 6% 28%	101916
	Night	14% 13% 4 10% 7% 6% 6% 4 5% 6% 25%	96422
Transparency	Day	55% 5% 12% 20% 7%	101658
	Night	58% 6% 11% 18% 6%	96298
Seeing	Day	20% 12% 30% 25% 10% 2	15579
	Night	20% 9% 30% 29% 11% 1	24709

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	7% 15% 7% 14% 8% 10% 7% 6% 8% 6% 11%	2208
	11th to 20th	Day	7% 12% 5% 18% 10% 9% 8% 6% 7% 6% 12%	2352
	21st to end	Day	15% 16% 8% 16% 7% 7% 6% 5% 5% 4 10%	2783
February	1st to 10th	Day	6% 12% 5% 10% 8% 6% 9% 9% 8% 7% 19%	1520
	11th to 20th	Day	6% 11% 6% 11% 7% 7% 9% 7% 7% 9% 20%	1611
	21st to end	Day	5% 11% 6% 12% 9% 9% 9% 6% 6% 6% 23%	1570
March	1st to 10th	Day	9% 10% 4 14% 7% 7% 5% 3 5% 6% 29%	3118
	11th to 20th	Day	10% 17% 5% 15% 10% 8% 6% 3 4 4 19%	3319
	21st to end	Day	13% 16% 5% 11% 7% 7% 7% 3 4 5% 22%	4059
April	1st to 10th	Day	11% 14% 4 10% 6% 6% 4 4 5% 6% 28%	2280
	11th to 20th	Day	17% 12% 3 8% 5% 5% 5% 3 5% 5% 32%	2432
	21st to end	Day	16% 11% 3 8% 6% 4 5% 3 5% 5% 34%	2480
May	1st to 10th	Day	17% 14% 5% 9% 5% 4 4 3 4 5% 30%	4428
	11th to 20th	Day	19% 12% 4 7% 5% 5% 5% 4 5% 6% 28%	4672
	21st to end	Day	24% 9% 3 5% 3 3 4 3 5% 7% 33%	5185
June	1st to 10th	Day	25% 9% 2 6% 5% 4 3 3 6% 7% 29%	2850
	11th to 20th	Day	14% 8% 3 7% 6% 5% 5% 4 5% 7% 35%	2857
	21st to end	Day	16% 7% 3 7% 6% 5% 5% 4 7% 7% 33%	3040
July	1st to 10th	Day	13% 6% 2 7% 5% 5% 4 4 5% 8% 41%	4770
	11th to 20th	Day	17% 5% 2 6% 4 4 4 4 6% 8% 39%	4760
	21st to end	Day	13% 6% 3 7% 5% 5% 6% 5% 7% 9% 34%	4918
August	1st to 10th	Day	22% 6% 2 5% 4 4 5% 4 6% 7% 34%	4423
	11th to 20th	Day	11% 5% 2 5% 3 4 4 4 6% 9% 47%	4238
	21st to end	Day	14% 6% 3 7% 5% 5% 4 4 6% 8% 40%	4532
September	1st to 10th	Day	18% 9% 3 8% 4 4 4 4 6% 6% 34%	2287
	11th to 20th	Day	24% 10% 2 7% 6% 4 5% 3 5% 6% 28%	2128
	21st to end	Day	23% 13% 3 7% 5% 4 4 3 4 6% 29%	2069
October	1st to 10th	Day	22% 16% 4 9% 5% 5% 4 3 5% 5% 22%	1901
	11th to 20th	Day	23% 21% 5% 8% 5% 5% 4 3 4 4 18%	1620
	21st to end	Day	20% 23% 4 11% 6% 5% 5% 3 5% 4 15%	1782
November	1st to 10th	Day	21% 19% 6% 13% 5% 4 4 3 3 6% 15%	1622
	11th to 20th	Day	18% 21% 7% 15% 8% 5% 4 4 3 4 13%	1340
	21st to end	Day	18% 22% 8% 17% 8% 5% 3 3 2 3 10%	1330
December	1st to 10th	Day	10% 18% 7% 15% 9% 5% 6% 4 5% 5% 15%	1330
	11th to 20th	Day	9% 16% 6% 11% 7% 10% 8% 5% 7% 8% 13%	1671
	21st to end	Day	10% 18% 7% 15% 10% 9% 6% 4 5% 4 12%	2431
January	1st to 10th	Night	7% 15% 5% 15% 10% 9% 8% 7% 6% 6% 11%	4748
	11th to 20th	Night	6% 13% 6% 17% 12% 10% 10% 7% 7% 5% 8%	4601
	21st to end	Night	11% 19% 8% 13% 7% 7% 7% 6% 6% 5% 12%	4884
February	1st to 10th	Night	5% 11% 6% 11% 7% 9% 12% 7% 7% 6% 20%	2660
	11th to 20th	Night	6% 14% 6% 11% 7% 8% 8% 6% 8% 7% 18%	2455
	21st to end	Night	5% 11% 5% 12% 9% 7% 8% 8% 8% 7% 22%	1884
March	1st to 10th	Night	10% 8% 4 11% 9% 6% 6% 4 6% 6% 30%	3722
	11th to 20th	Night	9% 15% 6% 16% 10% 6% 4 3 4 4 23%	3639
	21st to end	Night	13% 13% 3 9% 8% 8% 6% 5% 6% 5% 24%	3601
April	1st to 10th	Night	14% 15% 3 9% 6% 6% 5% 4 4 4 30%	1900
	11th to 20th	Night	16% 12% 4 8% 5% 5% 4 4 6% 6% 31%	1697
	21st to end	Night	15% 11% 4 7% 6% 4 3 3 4 5% 38%	1696
May	1st to 10th	Night	17% 11% 4 9% 4 4 4 3 4 6% 34%	2523
	11th to 20th	Night	18% 12% 3 6% 4 4 4 4 6% 7% 31%	2231
	21st to end	Night	22% 8% 2 5% 5% 4 5% 5% 5% 6% 33%	2402
June	1st to 10th	Night	22% 9% 3 8% 4 4 4 3 5% 6% 33%	1330
	11th to 20th	Night	16% 6% 2 5% 5% 4 4 4 7% 7% 39%	1312
	21st to end	Night	16% 6% 3 6% 6% 5% 5% 5% 6% 7% 36%	1140
July	1st to 10th	Night	15% 6% 2 7% 5% 5% 5% 4 6% 9% 36%	2179
	11th to 20th	Night	15% 6% 1 4 4 4 5% 4 6% 6% 44%	2210
	21st to end	Night	13% 6% 3 5% 4 4 4 4 7% 8% 42%	2644
August	1st to 10th	Night	20% 4 2 4 3 4 5% 4 5% 9% 40%	2517
	11th to 20th	Night	9% 5% 2 5% 3 4 3 3 6% 8% 51%	2597
	21st to end	Night	11% 4 2 6% 5% 4 5% 4 6% 9% 45%	3124
September	1st to 10th	Night	18% 7% 1 6% 4 4 4 3 5% 7% 41%	1890
	11th to 20th	Night	22% 8% 3 7% 4 5% 4 3 6% 6% 32%	2033
	21st to end	Night	20% 10% 2 6% 4 4 4 3 5% 6% 35%	2079
October	1st to 10th	Night	24% 14% 3 6% 4 3 3 4 5% 7% 27%	2057
	11th to 20th	Night	22% 19% 5% 9% 5% 4 5% 4 4 7% 18%	2340
	21st to end	Night	18% 19% 6% 11% 5% 5% 6% 3 4 5% 18%	2574
November	1st to 10th	Night	21% 20% 7% 12% 5% 5% 4 3 4 5% 15%	2455
	11th to 20th	Night	20% 20% 6% 13% 6% 5% 4 2 4 4 15%	2836
	21st to end	Night	16% 20% 7% 16% 8% 6% 4 3 3 4 13%	2850
December	1st to 10th	Night	10% 19% 7% 15% 10% 8% 6% 4 4 4 13%	2850
	11th to 20th	Night	9% 17% 6% 13% 7% 7% 7% 5% 5% 5% 18%	3526
	21st to end	Night	13% 14% 5% 14% 8% 6% 6% 5% 5% 5% 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	57% 7% 10% 18% 8%	1520
	11th to 20th	Day	58% 6% 11% 19% 5%	1619
	21st to end	Day	59% 4 12% 14% 11%	1570
March	1st to 10th	Day	56% 5% 6% 18% 14% 1	3120
	11th to 20th	Day	69% 4 8% 15% 3 1	3319
	21st to end	Day	64% 5% 5% 15% 10% 1	4059
April	1st to 10th	Day	56% 5% 9% 19% 11% 1	2280
	11th to 20th	Day	53% 4 7% 23% 11% 1	2432
	21st to end	Day	52% 4 9% 20% 14% 1	2480
May	1st to 10th	Day	56% 5% 12% 19% 7% 1	4440
	11th to 20th	Day	54% 6% 8% 19% 12% 1	4676
	21st to end	Day	50% 5% 11% 22% 11%	5185
June	1st to 10th	Day	54% 5% 10% 20% 10% 1	2850
	11th to 20th	Day	47% 7% 10% 23% 12% 2	2857
	21st to end	Day	48% 6% 13% 23% 9% 1	3040
July	1st to 10th	Day	40% 7% 15% 28% 10%	4696
	11th to 20th	Day	42% 6% 18% 27% 7%	4679
	21st to end	Day	43% 7% 20% 24% 5%	4762
August	1st to 10th	Day	47% 6% 15% 25% 7%	4408
	11th to 20th	Day	34% 6% 18% 37% 6%	4280
	21st to end	Day	42% 6% 17% 25% 11%	4531
September	1st to 10th	Day	50% 6% 15% 23% 6% 1	2287
	11th to 20th	Day	57% 6% 17% 16% 4	2128
	21st to end	Day	57% 5% 12% 19% 7%	2069
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	61% 5% 9% 17% 7%	2660
	11th to 20th	Night	60% 6% 10% 18% 6%	2457
	21st to end	Night	56% 6% 11% 18% 8%	1884
March	1st to 10th	Night	53% 5% 10% 20% 11%	3733
	11th to 20th	Night	65% 4 10% 16% 4	3640
	21st to end	Night	58% 7% 7% 17% 11%	3601
April	1st to 10th	Night	56% 5% 7% 18% 14%	1900
	11th to 20th	Night	52% 5% 9% 20% 13% 1	1697
	21st to end	Night	49% 4 7% 21% 16% 2	1696
May	1st to 10th	Night	50% 5% 8% 23% 13% 1	2530
	11th to 20th	Night	49% 7% 11% 19% 14% 1	2232
	21st to end	Night	49% 6% 10% 23% 11%	2403
June	1st to 10th	Night	51% 6% 11% 20% 11% 1	1330
	11th to 20th	Night	43% 7% 11% 25% 14% 1	1312
	21st to end	Night	44% 6% 12% 28% 10%	1140
July	1st to 10th	Night	44% 7% 14% 30% 5%	2144
	11th to 20th	Night	38% 6% 17% 28% 10%	2168
	21st to end	Night	37% 6% 18% 34% 4	2560
August	1st to 10th	Night	41% 7% 17% 28% 8%	2508
	11th to 20th	Night	31% 6% 17% 38% 8%	2621
	21st to end	Night	36% 6% 18% 27% 13%	3124
September	1st to 10th	Night	43% 5% 19% 26% 7%	1890
	11th to 20th	Night	51% 7% 19% 19% 3	2033
	21st to end	Night	49% 6% 17% 20% 8%	2079
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	13% 11% 31% 35% 9% 1	270
	11th to 20th	Day	9% 14% 40% 24% 10% 3	270
	21st to end	Day	12% 16% 43% 22% 6%	225
March	1st to 10th	Day	14% 14% 35% 23% 11% 3	270
	11th to 20th	Day	13% 14% 41% 25% 6% 2	364
	21st to end	Day	14% 11% 32% 30% 9% 4	506
April	1st to 10th	Day	15% 13% 34% 26% 10% 2	460
	11th to 20th	Day	26% 13% 27% 21% 11% 3	452
	21st to end	Day	21% 10% 29% 28% 9% 3	470
May	1st to 10th	Day	22% 15% 30% 23% 6% 3	653
	11th to 20th	Day	24% 15% 30% 21% 8% 2	675
	21st to end	Day	27% 10% 30% 25% 7% 1	734
June	1st to 10th	Day	26% 12% 32% 22% 6% 2	680
	11th to 20th	Day	19% 11% 29% 29% 10% 3	680
	21st to end	Day	19% 10% 29% 27% 13% 3	680
July	1st to 10th	Day	15% 10% 31% 28% 15% 1	671
	11th to 20th	Day	18% 10% 29% 30% 12% 2	668
	21st to end	Day	15% 8% 26% 27% 18% 5%	739
August	1st to 10th	Day	20% 9% 27% 26% 14% 4	676
	11th to 20th	Day	17% 9% 24% 26% 18% 7%	599
	21st to end	Day	21% 8% 28% 28% 11% 5%	539
September	1st to 10th	Day	21% 11% 30% 26% 11% 2	490
	11th to 20th	Day	27% 12% 29% 22% 9% 1	490
	21st to end	Day	29% 9% 27% 22% 11% 1	483
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	10% 9% 31% 36% 13% 1	950
	11th to 20th	Night	12% 8% 32% 34% 12% 2	844
	21st to end	Night	11% 8% 30% 32% 16% 3	628
March	1st to 10th	Night	12% 7% 33% 34% 12% 2	760
	11th to 20th	Night	16% 10% 39% 26% 8% 1	760
	21st to end	Night	17% 9% 33% 26% 13% 2	710
April	1st to 10th	Night	20% 9% 34% 26% 10% 1	570
	11th to 20th	Night	22% 8% 30% 27% 11% 2	563
	21st to end	Night	18% 9% 30% 30% 13% 1	570
May	1st to 10th	Night	22% 9% 33% 28% 7% 1	570
	11th to 20th	Night	24% 11% 31% 26% 8%	403
	21st to end	Night	25% 9% 34% 27% 4	411
June	1st to 10th	Night	25% 11% 29% 23% 11%	380
	11th to 20th	Night	17% 7% 35% 29% 12%	380
	21st to end	Night	15% 8% 31% 36% 10%	380
July	1st to 10th	Night	20% 6% 29% 32% 14%	370
	11th to 20th	Night	12% 6% 33% 40% 8% 1	368
	21st to end	Night	17% 3 25% 36% 17% 2	557
August	1st to 10th	Night	19% 6% 22% 40% 13% 2	567
	11th to 20th	Night	16% 6% 25% 32% 19% 2	564
	21st to end	Night	19% 7% 26% 34% 13% 1	627
September	1st to 10th	Night	19% 6% 28% 35% 11% 1	570
	11th to 20th	Night	25% 8% 33% 25% 8%	703
	21st to end	Night	26% 10% 26% 30% 8%	756
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 2024-09-26 09:52:25. Version ac07

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