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 2024-11-04.

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% 9% 3 8% 5% 5% 5% 4 6% 8% 38%	105639
	Night	7% 9% 3 9% 6% 5% 5% 4 6% 8% 37%	101954
Transparency	Day	41% 8% 16% 24% 10% 2	105383
	Night	42% 8% 15% 22% 11% 2	101856
Seeing	Day	13% 9% 27% 29% 17% 5%	15395
	Night	11% 6% 31% 35% 15% 2	24420

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 9% 6% 12% 6% 5% 5% 5% 6% 10% 33%	2219
	11th to 20th	Day	4 9% 3 12% 7% 6% 6% 5% 8% 7% 33%	2204
	21st to end	Day	5% 7% 4 10% 6% 6% 5% 4 7% 8% 38%	2794
February	1st to 10th	Day	5% 13% 5% 12% 7% 4 6% 5% 7% 8% 28%	1520
	11th to 20th	Day	7% 12% 4 10% 7% 6% 6% 5% 7% 8% 29%	1665
	21st to end	Day	3 13% 5% 12% 8% 6% 5% 5% 6% 7% 29%	1512
March	1st to 10th	Day	3 12% 5% 13% 7% 6% 5% 4 7% 7% 32%	3138
	11th to 20th	Day	7% 9% 3 6% 5% 4 4 3 6% 9% 44%	3474
	21st to end	Day	9% 21% 6% 13% 5% 4 4 3 5% 5% 24%	3855
April	1st to 10th	Day	7% 15% 4 10% 6% 5% 6% 5% 7% 7% 28%	2346
	11th to 20th	Day	11% 13% 4 9% 6% 5% 6% 4 6% 8% 29%	2440
	21st to end	Day	11% 12% 4 9% 5% 6% 5% 4 5% 8% 30%	2470
May	1st to 10th	Day	18% 13% 4 7% 5% 5% 5% 4 5% 6% 28%	4363
	11th to 20th	Day	10% 9% 3 8% 6% 6% 6% 5% 8% 8% 31%	4694
	21st to end	Day	17% 9% 3 9% 6% 6% 7% 4 7% 7% 25%	5161
June	1st to 10th	Day	16% 7% 3 7% 6% 6% 7% 5% 7% 9% 28%	2850
	11th to 20th	Day	18% 9% 3 8% 6% 6% 6% 5% 7% 8% 25%	2850
	21st to end	Day	7% 5% 2 6% 6% 5% 6% 4 8% 10% 40%	2850
July	1st to 10th	Day	6% 4 2 6% 4 4 5% 5% 7% 9% 48%	4740
	11th to 20th	Day	7% 3 1 4 3 4 4 4 8% 11% 50%	4740
	21st to end	Day	4 3 1 4 4 4 4 4 6% 9% 57%	5059
August	1st to 10th	Day	8% 6% 2 6% 5% 5% 5% 5% 7% 9% 42%	4401
	11th to 20th	Day	6% 5% 2 5% 5% 5% 5% 5% 7% 11% 44%	4058
	21st to end	Day	10% 4 1 4 3 4 4 3 5% 8% 53%	4521
September	1st to 10th	Day	10% 6% 2 6% 4 4 3 3 6% 7% 50%	2365
	11th to 20th	Day	15% 8% 2 5% 3 4 4 3 5% 6% 44%	2090
	21st to end	Day	7% 9% 3 6% 4 4 5% 4 5% 8% 44%	2090
October	1st to 10th	Day	7% 6% 3 7% 5% 5% 5% 4 7% 8% 42%	3332
	11th to 20th	Day	6% 7% 2 7% 4 5% 5% 4 6% 9% 44%	2936
	21st to end	Day	7% 7% 3 7% 5% 5% 5% 4 5% 7% 44%	3101
November	1st to 10th	Day	9% 16% 5% 8% 6% 5% 4 3 5% 7% 31%	1560
	11th to 20th	Day	7% 10% 4 8% 5% 5% 5% 5% 6% 7% 37%	1457
	21st to end	Day	5% 13% 3 8% 5% 4 4 5% 8% 11% 34%	1330
December	1st to 10th	Day	6% 13% 4 11% 6% 5% 6% 4 6% 6% 32%	1330
	11th to 20th	Day	4 12% 4 14% 6% 6% 5% 5% 6% 8% 30%	1682
	21st to end	Day	3 8% 3 9% 5% 4 5% 4 6% 8% 43%	2442
January	1st to 10th	Night	4 13% 5% 12% 7% 6% 6% 5% 7% 9% 26%	4726
	11th to 20th	Night	3 9% 5% 14% 6% 6% 7% 5% 6% 8% 33%	4699
	21st to end	Night	4 10% 4 10% 6% 5% 5% 4 6% 8% 37%	4885
February	1st to 10th	Night	5% 11% 4 13% 7% 7% 6% 4 6% 7% 30%	2660
	11th to 20th	Night	5% 13% 5% 10% 7% 5% 5% 5% 6% 8% 29%	2402
	21st to end	Night	3 11% 5% 11% 7% 7% 5% 5% 7% 9% 32%	1941
March	1st to 10th	Night	3 9% 5% 15% 8% 8% 7% 5% 7% 8% 25%	3736
	11th to 20th	Night	7% 8% 3 6% 4 5% 5% 4 7% 9% 42%	3504
	21st to end	Night	8% 20% 6% 15% 6% 5% 6% 4 5% 6% 18%	3784
April	1st to 10th	Night	9% 12% 4 9% 6% 6% 5% 5% 8% 9% 27%	1834
	11th to 20th	Night	9% 12% 4 10% 6% 6% 5% 4 7% 7% 30%	1691
	21st to end	Night	11% 11% 4 7% 6% 5% 5% 4 7% 8% 31%	1710
May	1st to 10th	Night	18% 14% 3 8% 5% 4 4 4 5% 5% 30%	2600
	11th to 20th	Night	10% 8% 3 7% 5% 5% 5% 4 9% 10% 34%	2199
	21st to end	Night	16% 9% 3 11% 7% 6% 6% 5% 7% 7% 24%	2414
June	1st to 10th	Night	15% 9% 3 7% 6% 5% 5% 4 6% 8% 31%	1330
	11th to 20th	Night	16% 8% 3 8% 5% 6% 4 5% 7% 8% 29%	1330
	21st to end	Night	8% 5% 3 5% 5% 5% 6% 5% 7% 8% 42%	1330
July	1st to 10th	Night	6% 5% 2 6% 6% 5% 6% 5% 7% 8% 46%	2220
	11th to 20th	Night	5% 3 1 5% 4 4 6% 6% 10% 12% 44%	2220
	21st to end	Night	4 4 2 4 4 4 4 4 6% 9% 55%	2492
August	1st to 10th	Night	10% 6% 2 6% 4 4 5% 4 7% 9% 42%	2529
	11th to 20th	Night	6% 5% 2 6% 4 4 6% 5% 8% 12% 41%	2778
	21st to end	Night	8% 4 1 5% 3 4 4 4 6% 9% 51%	3146
September	1st to 10th	Night	9% 6% 2 7% 3 4 4 4 6% 7% 49%	1813
	11th to 20th	Night	13% 7% 2 5% 4 4 4 3 5% 8% 46%	2090
	21st to end	Night	9% 7% 2 5% 3 4 4 4 6% 9% 47%	2090
October	1st to 10th	Night	7% 6% 2 6% 4 4 4 4 6% 8% 48%	3642
	11th to 20th	Night	6% 8% 2 5% 4 5% 5% 4 6% 8% 46%	3988
	21st to end	Night	5% 7% 3 7% 5% 4 6% 4 7% 8% 43%	4457
November	1st to 10th	Night	9% 13% 4 9% 5% 5% 4 4 5% 8% 34%	2569
	11th to 20th	Night	4 11% 4 9% 6% 5% 5% 4 7% 9% 36%	2721
	21st to end	Night	4 12% 3 8% 6% 5% 5% 4 7% 9% 36%	2850
December	1st to 10th	Night	5% 12% 5% 12% 6% 5% 4 4 6% 7% 33%	2850
	11th to 20th	Night	2 10% 5% 12% 7% 6% 6% 5% 6% 9% 32%	3510
	21st to end	Night	4 9% 3 8% 6% 5% 5% 4 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	48% 7% 17% 16% 11% 1	3138
	11th to 20th	Day	34% 7% 20% 25% 13% 1	3475
	21st to end	Day	60% 8% 12% 16% 5%	3855
April	1st to 10th	Day	51% 10% 16% 16% 8%	2346
	11th to 20th	Day	49% 8% 13% 20% 9% 1	2440
	21st to end	Day	50% 8% 14% 19% 8% 1	2470
May	1st to 10th	Day	54% 7% 12% 22% 4	4363
	11th to 20th	Day	41% 11% 17% 22% 8%	4698
	21st to end	Day	52% 12% 14% 16% 5% 1	5162
June	1st to 10th	Day	46% 10% 17% 19% 8% 1	2850
	11th to 20th	Day	51% 9% 15% 16% 6% 2	2850
	21st to end	Day	35% 9% 21% 25% 8% 2	2850
July	1st to 10th	Day	29% 8% 17% 27% 15% 3	4666
	11th to 20th	Day	25% 8% 20% 35% 11% 1	4659
	21st to end	Day	21% 6% 16% 29% 21% 6%	4899
August	1st to 10th	Day	36% 8% 17% 31% 8% 1	4384
	11th to 20th	Day	31% 8% 25% 29% 6% 1	4097
	21st to end	Day	29% 6% 20% 32% 12% 1	4520
September	1st to 10th	Day	33% 6% 17% 25% 14% 5%	2365
	11th to 20th	Day	39% 6% 14% 27% 11% 2	2090
	21st to end	Day	36% 8% 15% 26% 12% 3	2090
October	1st to 10th	Day	38% 6% 19% 30% 7% 1	3332
	11th to 20th	Day	35% 6% 21% 25% 12% 2	2936
	21st to end	Day	39% 6% 10% 32% 12% 1	3101
November	1st to 10th	Day	52% 7% 10% 20% 9% 2	1560
	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% 11% 12% 20% 7% 1	3736
	11th to 20th	Night	34% 11% 21% 21% 12% 1	3504
	21st to end	Night	64% 8% 11% 12% 4 1	3784
April	1st to 10th	Night	49% 8% 14% 17% 11%	1834
	11th to 20th	Night	51% 7% 14% 20% 8% 1	1691
	21st to end	Night	47% 8% 15% 20% 8% 2	1710
May	1st to 10th	Night	54% 7% 12% 21% 7%	2600
	11th to 20th	Night	36% 13% 15% 25% 10% 1	2199
	21st to end	Night	51% 14% 16% 14% 4 1	2414
June	1st to 10th	Night	49% 8% 14% 18% 9% 1	1330
	11th to 20th	Night	49% 11% 14% 16% 7% 2	1330
	21st to end	Night	35% 11% 19% 24% 9% 1	1330
July	1st to 10th	Night	33% 8% 17% 23% 18% 1	2185
	11th to 20th	Night	26% 9% 20% 34% 7% 3	2178
	21st to end	Night	23% 7% 13% 31% 21% 5%	2413
August	1st to 10th	Night	35% 7% 16% 30% 11% 1	2521
	11th to 20th	Night	32% 10% 24% 27% 7% 1	2805
	21st to end	Night	29% 5% 21% 32% 11% 2	3146
September	1st to 10th	Night	33% 8% 16% 23% 14% 6%	1813
	11th to 20th	Night	37% 6% 15% 24% 13% 4	2090
	21st to end	Night	33% 7% 17% 26% 14% 4	2090
October	1st to 10th	Night	33% 5% 18% 27% 16% 2	3642
	11th to 20th	Night	34% 7% 18% 25% 15% 2	3988
	21st to end	Night	37% 6% 12% 32% 13%	4457
November	1st to 10th	Night	48% 7% 13% 20% 10% 2	2569
	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% 34% 21% 13% 4	506
April	1st to 10th	Day	13% 15% 34% 25% 11% 1	460
	11th to 20th	Day	13% 13% 27% 29% 13% 4	452
	21st to end	Day	17% 13% 30% 24% 13% 3	460
May	1st to 10th	Day	19% 10% 22% 27% 17% 5%	525
	11th to 20th	Day	15% 7% 23% 32% 20% 4	675
	21st to end	Day	16% 7% 21% 28% 22% 6%	734
June	1st to 10th	Day	15% 8% 25% 33% 14% 4	680
	11th to 20th	Day	19% 9% 28% 26% 16% 3	680
	21st to end	Day	10% 5% 23% 34% 22% 7%	680
July	1st to 10th	Day	10% 4 20% 34% 25% 6%	671
	11th to 20th	Day	12% 4 23% 32% 25% 5%	668
	21st to end	Day	5% 4 22% 35% 25% 8%	696
August	1st to 10th	Day	10% 7% 22% 30% 24% 7%	487
	11th to 20th	Day	9% 3 20% 34% 25% 8%	477
	21st to end	Day	9% 9% 20% 29% 22% 9%	539
September	1st to 10th	Day	14% 8% 26% 29% 18% 6%	490
	11th to 20th	Day	20% 6% 23% 28% 19% 5%	490
	21st to end	Day	13% 14% 26% 29% 12% 5%	490
October	1st to 10th	Day	18% 9% 24% 28% 15% 6%	397
	11th to 20th	Day	11% 9% 33% 28% 14% 5%	300
	21st to end	Day	14% 16% 29% 28% 11% 2	330
November	1st to 10th	Day	17% 13% 30% 25% 12% 3	279
	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	11% 7% 33% 34% 13% 1	694
	11th to 20th	Night	15% 6% 36% 32% 12%	563
	21st to end	Night	14% 8% 31% 35% 11%	570
May	1st to 10th	Night	16% 7% 30% 32% 15%	489
	11th to 20th	Night	13% 6% 27% 37% 16% 1	374
	21st to end	Night	20% 5% 22% 32% 19% 1	411
June	1st to 10th	Night	18% 10% 25% 32% 13% 2	380
	11th to 20th	Night	18% 4 30% 34% 13% 1	380
	21st to end	Night	11% 4 22% 39% 22% 2	380
July	1st to 10th	Night	10% 4 16% 42% 27% 2	370
	11th to 20th	Night	11% 2 24% 42% 20% 2	368
	21st to end	Night	4 2 20% 45% 26% 3	416
August	1st to 10th	Night	11% 3 17% 40% 27% 1	378
	11th to 20th	Night	9% 3 17% 46% 24% 1	543
	21st to end	Night	11% 5% 22% 38% 24% 1	627
September	1st to 10th	Night	11% 3 26% 38% 19% 2	649
	11th to 20th	Night	14% 5% 21% 37% 21% 2	760
	21st to end	Night	12% 4 31% 36% 15% 2	760
October	1st to 10th	Night	15% 6% 26% 36% 16% 3	760
	11th to 20th	Night	13% 5% 32% 35% 14% 2	760
	21st to end	Night	11% 8% 34% 35% 11%	836
November	1st to 10th	Night	14% 10% 34% 31% 10% 1	873
	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

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