Keoma Public Fields
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Keoma Public Fields clear sky chart from 2005-11-06 to 2024-04-03.

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	9% 8% 4 7% 6% 4 5% 5% 6% 8% 37%	78268
	Night	7% 9% 4 8% 7% 4 6% 6% 6% 8% 36%	81817
Transparency	Day	42% 8% 16% 22% 9% 2	77973
	Night	43% 8% 15% 21% 11% 2	81692
Seeing	Day	13% 9% 27% 29% 17% 5%	14482
	Night	11% 6% 31% 35% 15% 2	23807

By Month

Percentage Cloud Cover NW (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	3 8% 7% 11% 7% 3 6% 6% 6% 10% 33%	2219
	11th to 20th	Day	4 8% 3 10% 8% 4 6% 7% 7% 7% 33%	2204
	21st to end	Day	5% 7% 4 8% 8% 4 6% 5% 7% 8% 38%	2794
February	1st to 10th	Day	5% 12% 6% 10% 8% 4 7% 5% 7% 8% 28%	1520
	11th to 20th	Day	7% 11% 5% 8% 9% 4 7% 6% 6% 8% 29%	1665
	21st to end	Day	4 12% 6% 11% 9% 4 6% 6% 6% 7% 29%	1512
March	1st to 10th	Day	4 12% 5% 10% 9% 4 6% 5% 7% 7% 31%	1900
	11th to 20th	Day	7% 9% 5% 7% 7% 4 5% 5% 7% 9% 35%	2074
	21st to end	Day	8% 16% 6% 8% 7% 4 5% 5% 6% 7% 27%	2318
April	1st to 10th	Day	8% 13% 5% 9% 6% 4 7% 6% 7% 7% 28%	2247
	11th to 20th	Day	11% 13% 4 8% 6% 3 6% 5% 5% 8% 29%	2310
	21st to end	Day	12% 11% 4 8% 6% 4 6% 5% 5% 8% 31%	2340
May	1st to 10th	Day	13% 10% 4 7% 6% 4 5% 6% 6% 8% 29%	2472
	11th to 20th	Day	11% 7% 3 7% 6% 3 6% 6% 7% 9% 37%	2654
	21st to end	Day	19% 7% 3 6% 6% 3 6% 5% 6% 8% 30%	2917
June	1st to 10th	Day	16% 6% 3 6% 6% 5% 6% 7% 7% 9% 28%	2700
	11th to 20th	Day	19% 8% 3 6% 6% 4 7% 6% 7% 8% 26%	2700
	21st to end	Day	8% 5% 2 6% 6% 4 6% 5% 8% 10% 41%	2700
July	1st to 10th	Day	8% 4 3 6% 5% 3 5% 6% 7% 10% 42%	2700
	11th to 20th	Day	10% 4 2 4 5% 3 5% 5% 7% 10% 44%	2700
	21st to end	Day	5% 3 2 3 4 3 5% 5% 6% 10% 54%	2898
August	1st to 10th	Day	10% 5% 2 3 5% 3 4 6% 6% 9% 45%	2507
	11th to 20th	Day	9% 4 2 3 5% 3 5% 6% 6% 10% 48%	2317
	21st to end	Day	10% 4 2 4 4 3 5% 5% 6% 8% 50%	2574
September	1st to 10th	Day	11% 6% 2 5% 5% 3 3 4 6% 7% 49%	2242
	11th to 20th	Day	14% 8% 3 4 4 3 4 5% 6% 6% 45%	1980
	21st to end	Day	8% 9% 3 6% 5% 3 5% 5% 5% 8% 44%	1980
October	1st to 10th	Day	13% 10% 3 6% 5% 3 4 5% 5% 6% 40%	1892
	11th to 20th	Day	10% 8% 3 7% 6% 4 5% 5% 6% 7% 40%	1675
	21st to end	Day	8% 9% 4 6% 6% 4 7% 5% 6% 8% 36%	1782
November	1st to 10th	Day	9% 15% 6% 7% 7% 4 5% 4 5% 7% 31%	1534
	11th to 20th	Day	7% 10% 5% 7% 7% 4 5% 5% 6% 7% 37%	1457
	21st to end	Day	6% 11% 5% 8% 6% 3 5% 5% 8% 11% 34%	1330
December	1st to 10th	Day	6% 12% 5% 11% 7% 4 6% 5% 6% 6% 33%	1330
	11th to 20th	Day	4 11% 5% 12% 7% 4 6% 6% 6% 8% 31%	1682
	21st to end	Day	3 8% 3 8% 7% 3 5% 6% 6% 9% 43%	2442
January	1st to 10th	Night	4 12% 5% 10% 8% 4 7% 6% 7% 9% 27%	4726
	11th to 20th	Night	3 8% 5% 13% 7% 4 7% 7% 6% 8% 33%	4699
	21st to end	Night	4 10% 5% 9% 7% 4 5% 5% 6% 8% 37%	4885
February	1st to 10th	Night	5% 9% 6% 11% 9% 5% 7% 5% 6% 7% 30%	2660
	11th to 20th	Night	5% 12% 6% 9% 8% 4 6% 6% 6% 8% 30%	2402
	21st to end	Night	3 9% 5% 9% 8% 5% 6% 6% 7% 9% 32%	1941
March	1st to 10th	Night	4 11% 5% 10% 9% 5% 6% 5% 7% 9% 28%	2280
	11th to 20th	Night	6% 9% 6% 8% 5% 4 6% 6% 7% 8% 34%	2104
	21st to end	Night	7% 15% 6% 10% 8% 4 5% 5% 6% 8% 26%	2278
April	1st to 10th	Night	8% 11% 4 8% 7% 4 7% 6% 8% 9% 27%	1758
	11th to 20th	Night	10% 11% 4 8% 7% 5% 6% 5% 6% 8% 30%	1601
	21st to end	Night	11% 10% 5% 6% 6% 4 5% 5% 8% 8% 31%	1620
May	1st to 10th	Night	10% 12% 4 8% 6% 4 5% 6% 6% 7% 33%	1486
	11th to 20th	Night	11% 7% 3 5% 6% 3 5% 4 6% 7% 43%	1239
	21st to end	Night	18% 6% 2 6% 5% 3 7% 6% 7% 8% 30%	1358
June	1st to 10th	Night	16% 8% 4 7% 7% 4 6% 5% 6% 8% 31%	1260
	11th to 20th	Night	17% 7% 3 7% 6% 4 5% 7% 7% 8% 29%	1260
	21st to end	Night	8% 5% 3 5% 6% 3 6% 7% 7% 8% 42%	1260
July	1st to 10th	Night	8% 4 2 4 5% 3 6% 7% 7% 9% 43%	1260
	11th to 20th	Night	8% 4 2 6% 5% 3 6% 8% 7% 10% 41%	1260
	21st to end	Night	4 3 2 4 5% 3 4 5% 6% 9% 55%	1418
August	1st to 10th	Night	10% 5% 3 4 5% 3 5% 5% 7% 9% 45%	1432
	11th to 20th	Night	8% 4 2 4 3 2 5% 5% 7% 11% 48%	1582
	21st to end	Night	9% 5% 2 4 4 2 3 5% 6% 9% 50%	1782
September	1st to 10th	Night	9% 6% 2 6% 5% 3 5% 4 6% 7% 47%	1716
	11th to 20th	Night	12% 7% 3 4 4 3 4 3 6% 8% 46%	1980
	21st to end	Night	10% 7% 2 4 4 3 5% 5% 5% 9% 46%	1980
October	1st to 10th	Night	10% 8% 3 7% 5% 3 4 5% 6% 8% 41%	2067
	11th to 20th	Night	8% 9% 3 5% 5% 4 5% 5% 7% 9% 40%	2281
	21st to end	Night	7% 9% 4 8% 6% 4 5% 6% 6% 9% 36%	2574
November	1st to 10th	Night	10% 12% 4 8% 6% 3 5% 4 5% 8% 34%	2523
	11th to 20th	Night	4 10% 5% 8% 7% 4 6% 5% 7% 9% 36%	2721
	21st to end	Night	4 10% 4 7% 7% 4 6% 5% 6% 9% 37%	2850
December	1st to 10th	Night	5% 10% 5% 11% 7% 4 5% 5% 6% 7% 33%	2850
	11th to 20th	Night	3 9% 5% 10% 8% 5% 6% 6% 6% 9% 32%	3510
	21st to end	Night	4 8% 3 7% 7% 4 5% 5% 5% 7% 44%	5214

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	43% 9% 14% 23% 9% 2	2219
	11th to 20th	Day	46% 8% 11% 16% 16% 4	2225
	21st to end	Day	39% 8% 16% 28% 7% 1	2794
February	1st to 10th	Day	52% 7% 16% 14% 9% 2	1520
	11th to 20th	Day	50% 9% 13% 17% 9% 2	1674
	21st to end	Day	51% 7% 13% 20% 10% 1	1512
March	1st to 10th	Day	49% 8% 17% 17% 8% 1	1900
	11th to 20th	Day	42% 8% 15% 22% 11% 1	2075
	21st to end	Day	53% 9% 15% 16% 6%	2318
April	1st to 10th	Day	51% 9% 17% 16% 7%	2247
	11th to 20th	Day	50% 7% 12% 20% 9% 1	2310
	21st to end	Day	50% 8% 14% 19% 8% 1	2340
May	1st to 10th	Day	51% 8% 14% 19% 7% 1	2472
	11th to 20th	Day	40% 8% 16% 25% 10% 1	2658
	21st to end	Day	50% 8% 14% 21% 6% 1	2918
June	1st to 10th	Day	47% 9% 17% 19% 7% 1	2700
	11th to 20th	Day	52% 9% 16% 16% 5% 1	2700
	21st to end	Day	35% 9% 21% 25% 8% 2	2700
July	1st to 10th	Day	34% 11% 21% 24% 9% 2	2626
	11th to 20th	Day	33% 10% 22% 26% 9%	2619
	21st to end	Day	24% 9% 21% 32% 13% 1	2737
August	1st to 10th	Day	33% 9% 20% 28% 9% 2	2490
	11th to 20th	Day	29% 9% 23% 27% 10% 2	2317
	21st to end	Day	30% 8% 20% 27% 13% 1	2574
September	1st to 10th	Day	34% 6% 17% 26% 13% 4	2242
	11th to 20th	Day	38% 6% 14% 28% 12% 2	1980
	21st to end	Day	37% 8% 15% 25% 12% 3	1980
October	1st to 10th	Day	42% 8% 14% 25% 9% 1	1892
	11th to 20th	Day	41% 7% 16% 25% 9% 2	1675
	21st to end	Day	44% 9% 13% 21% 11% 1	1782
November	1st to 10th	Day	52% 7% 10% 20% 8% 2	1534
	11th to 20th	Day	45% 7% 15% 22% 9% 1	1457
	21st to end	Day	41% 9% 16% 23% 8% 2	1330
December	1st to 10th	Day	50% 7% 12% 17% 11% 3	1330
	11th to 20th	Day	49% 8% 17% 19% 7% 1	1684
	21st to end	Day	35% 9% 12% 21% 18% 5%	2442
January	1st to 10th	Night	49% 10% 13% 19% 6% 2	4726
	11th to 20th	Night	48% 8% 11% 16% 15% 4	4740
	21st to end	Night	42% 8% 14% 23% 11% 1	4885
February	1st to 10th	Night	50% 7% 13% 18% 10% 2	2660
	11th to 20th	Night	50% 7% 12% 18% 11% 2	2403
	21st to end	Night	45% 8% 13% 21% 12% 2	1941
March	1st to 10th	Night	49% 9% 13% 21% 7% 1	2280
	11th to 20th	Night	44% 7% 17% 19% 12% 1	2104
	21st to end	Night	54% 8% 14% 16% 7% 1	2278
April	1st to 10th	Night	49% 8% 14% 17% 11%	1758
	11th to 20th	Night	51% 6% 15% 19% 7% 1	1601
	21st to end	Night	47% 8% 15% 20% 8% 2	1620
May	1st to 10th	Night	47% 7% 14% 20% 11% 1	1486
	11th to 20th	Night	38% 9% 15% 24% 13% 1	1239
	21st to end	Night	46% 10% 16% 20% 7% 1	1358
June	1st to 10th	Night	49% 8% 14% 19% 9%	1260
	11th to 20th	Night	50% 12% 14% 16% 7% 2	1260
	21st to end	Night	35% 12% 19% 24% 9% 1	1260
July	1st to 10th	Night	33% 11% 22% 24% 10% 1	1225
	11th to 20th	Night	34% 12% 20% 23% 10% 2	1218
	21st to end	Night	23% 10% 19% 32% 15% 1	1339
August	1st to 10th	Night	33% 10% 20% 26% 10% 1	1424
	11th to 20th	Night	27% 10% 22% 28% 11% 2	1582
	21st to end	Night	30% 7% 16% 30% 14% 3	1782
September	1st to 10th	Night	33% 8% 16% 24% 14% 5%	1716
	11th to 20th	Night	36% 6% 15% 24% 13% 5%	1980
	21st to end	Night	34% 7% 17% 25% 13% 4	1980
October	1st to 10th	Night	40% 7% 15% 25% 13% 1	2067
	11th to 20th	Night	38% 9% 16% 23% 11% 3	2281
	21st to end	Night	43% 8% 15% 22% 11% 1	2574
November	1st to 10th	Night	48% 7% 12% 20% 10% 2	2523
	11th to 20th	Night	43% 8% 17% 19% 13% 1	2721
	21st to end	Night	42% 9% 17% 20% 9% 2	2850
December	1st to 10th	Night	49% 7% 12% 20% 9% 3	2850
	11th to 20th	Night	45% 11% 17% 21% 6% 1	3507
	21st to end	Night	37% 7% 12% 25% 15% 5%	5214

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	5% 9% 31% 30% 15% 10%	180
	11th to 20th	Day	9% 9% 34% 27% 16% 5%	180
	21st to end	Day	9% 8% 33% 33% 15% 3	198
February	1st to 10th	Day	14% 12% 35% 27% 9% 4	180
	11th to 20th	Day	10% 10% 35% 29% 14% 1	270
	21st to end	Day	8% 9% 36% 30% 14% 3	324
March	1st to 10th	Day	9% 12% 36% 28% 11% 4	460
	11th to 20th	Day	8% 14% 32% 31% 12% 4	460
	21st to end	Day	15% 13% 35% 21% 13% 4	506
April	1st to 10th	Day	13% 14% 34% 26% 12% 1	429
	11th to 20th	Day	14% 13% 27% 28% 14% 4	412
	21st to end	Day	18% 11% 30% 25% 13% 3	420
May	1st to 10th	Day	18% 10% 22% 28% 17% 5%	481
	11th to 20th	Day	16% 6% 22% 31% 21% 4	625
	21st to end	Day	17% 6% 21% 28% 21% 6%	679
June	1st to 10th	Day	16% 7% 24% 34% 15% 4	630
	11th to 20th	Day	20% 8% 27% 26% 16% 2	630
	21st to end	Day	10% 4 22% 33% 23% 7%	630
July	1st to 10th	Day	10% 5% 21% 33% 25% 6%	621
	11th to 20th	Day	12% 4 24% 32% 24% 4	618
	21st to end	Day	5% 5% 21% 36% 25% 8%	644
August	1st to 10th	Day	11% 6% 22% 30% 24% 7%	447
	11th to 20th	Day	10% 4 21% 33% 26% 7%	437
	21st to end	Day	8% 9% 20% 30% 23% 10%	495
September	1st to 10th	Day	15% 8% 27% 29% 17% 5%	450
	11th to 20th	Day	20% 6% 22% 28% 19% 5%	450
	21st to end	Day	14% 14% 25% 29% 13% 5%	450
October	1st to 10th	Day	19% 9% 23% 27% 15% 7%	362
	11th to 20th	Day	11% 10% 32% 29% 13% 5%	270
	21st to end	Day	14% 16% 30% 27% 11% 1	297
November	1st to 10th	Day	18% 13% 31% 24% 11% 3	270
	11th to 20th	Day	15% 12% 35% 30% 5% 3	239
	21st to end	Day	6% 11% 37% 23% 16% 7%	180
December	1st to 10th	Day	9% 6% 41% 27% 13% 4	180
	11th to 20th	Day	9% 10% 42% 26% 12% 2	180
	21st to end	Day	9% 5% 29% 32% 20% 6%	198
January	1st to 10th	Night	9% 8% 34% 35% 12% 2	950
	11th to 20th	Night	9% 7% 38% 33% 12% 1	950
	21st to end	Night	10% 9% 36% 32% 12% 1	846
February	1st to 10th	Night	9% 10% 31% 31% 15% 4	760
	11th to 20th	Night	10% 7% 32% 38% 13% 1	744
	21st to end	Night	6% 7% 31% 33% 18% 5%	628
March	1st to 10th	Night	8% 6% 34% 34% 15% 3	760
	11th to 20th	Night	9% 6% 36% 34% 13% 2	760
	21st to end	Night	13% 7% 30% 34% 14% 2	836
April	1st to 10th	Night	10% 6% 33% 35% 14% 2	666
	11th to 20th	Night	15% 6% 34% 33% 12%	533
	21st to end	Night	14% 7% 31% 36% 11%	540
May	1st to 10th	Night	15% 7% 30% 33% 15%	464
	11th to 20th	Night	13% 5% 26% 38% 16% 1	354
	21st to end	Night	20% 5% 23% 32% 20% 1	389
June	1st to 10th	Night	18% 9% 25% 33% 14% 2	360
	11th to 20th	Night	19% 4 29% 34% 13% 1	360
	21st to end	Night	11% 4 21% 40% 22% 2	360
July	1st to 10th	Night	10% 4 16% 41% 27% 2	350
	11th to 20th	Night	11% 2 25% 41% 18% 3	348
	21st to end	Night	4 2 20% 46% 26% 3	394
August	1st to 10th	Night	12% 3 16% 41% 27% 1	358
	11th to 20th	Night	9% 3 18% 46% 23% 1	514
	21st to end	Night	10% 5% 21% 39% 25% 1	594
September	1st to 10th	Night	12% 3 27% 37% 19% 2	614
	11th to 20th	Night	14% 6% 22% 37% 20% 2	720
	21st to end	Night	12% 4 30% 35% 16% 2	720
October	1st to 10th	Night	15% 5% 25% 35% 17% 3	720
	11th to 20th	Night	13% 5% 31% 34% 14% 2	720
	21st to end	Night	11% 8% 34% 35% 11% 1	792
November	1st to 10th	Night	14% 10% 34% 31% 10% 1	858
	11th to 20th	Night	9% 8% 42% 31% 8% 2	950
	21st to end	Night	9% 7% 38% 34% 10% 2	950
December	1st to 10th	Night	9% 8% 33% 35% 13% 2	950
	11th to 20th	Night	7% 6% 38% 37% 10% 1	950
	21st to end	Night	12% 5% 31% 38% 11% 3	1045

Page generated at 2024-03-31 04:08:55. Version ac07

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