Blue Springs Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Blue Springs Camp clear sky chart from 2005-11-06 to 2024-04-10.

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 8% 6% 4 5% 5% 5% 7% 30%	83512
	Night	15% 10% 5% 8% 6% 3 5% 5% 5% 6% 32%	85246
Transparency	Day	51% 7% 12% 18% 10% 1	83228
	Night	50% 8% 12% 19% 10% 1	85066
Seeing	Day	19% 18% 30% 20% 9% 3	13957
	Night	18% 17% 31% 23% 9% 1	23233

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	15% 17% 9% 11% 6% 3 4 3 4 6% 22%	2517
	11th to 20th	Day	11% 19% 10% 17% 9% 3 4 5% 5% 5% 11%	2840
	21st to end	Day	21% 19% 8% 13% 8% 4 4 3 3 4 14%	3124
February	1st to 10th	Day	14% 17% 6% 13% 11% 4 5% 5% 4 4 17%	1710
	11th to 20th	Day	13% 13% 7% 13% 10% 4 4 4 5% 6% 22%	1663
	21st to end	Day	18% 13% 6% 11% 8% 4 6% 3 3 5% 24%	1489
March	1st to 10th	Day	18% 13% 6% 9% 7% 3 4 4 4 5% 28%	3422
	11th to 20th	Day	11% 14% 6% 9% 7% 4 5% 5% 5% 6% 28%	3480
	21st to end	Day	16% 11% 4 7% 6% 3 5% 6% 5% 6% 32%	3815
April	1st to 10th	Day	18% 13% 4 8% 6% 4 4 4 4 7% 27%	2206
	11th to 20th	Day	18% 9% 3 7% 5% 3 4 4 4 6% 36%	2235
	21st to end	Day	21% 9% 4 7% 6% 3 4 4 4 7% 32%	2340
May	1st to 10th	Day	18% 8% 4 7% 5% 3 5% 4 5% 7% 33%	2340
	11th to 20th	Day	15% 8% 3 7% 5% 4 5% 4 5% 7% 37%	2414
	21st to end	Day	12% 5% 3 7% 5% 3 5% 5% 6% 9% 41%	2725
June	1st to 10th	Day	14% 6% 2 6% 5% 3 5% 6% 6% 9% 38%	2520
	11th to 20th	Day	12% 5% 2 7% 5% 3 4 5% 7% 8% 40%	2578
	21st to end	Day	14% 5% 2 5% 6% 4 5% 5% 6% 9% 40%	2700
July	1st to 10th	Day	9% 5% 2 5% 5% 3 5% 6% 7% 9% 44%	2646
	11th to 20th	Day	11% 6% 2 6% 5% 4 6% 6% 8% 10% 36%	2491
	21st to end	Day	11% 5% 3 6% 6% 4 6% 5% 7% 10% 37%	2547
August	1st to 10th	Day	10% 5% 2 5% 6% 4 7% 6% 8% 10% 38%	2327
	11th to 20th	Day	10% 6% 3 6% 8% 4 7% 6% 7% 9% 35%	2303
	21st to end	Day	12% 7% 3 6% 5% 3 6% 5% 6% 9% 38%	2502
September	1st to 10th	Day	12% 6% 3 6% 6% 4 5% 6% 5% 8% 39%	2160
	11th to 20th	Day	13% 6% 3 5% 5% 3 4 5% 6% 9% 42%	2013
	21st to end	Day	15% 7% 3 6% 6% 4 6% 5% 5% 9% 34%	1968
October	1st to 10th	Day	19% 10% 3 7% 6% 3 4 4 5% 6% 33%	1800
	11th to 20th	Day	21% 10% 5% 8% 6% 4 4 5% 5% 5% 27%	1800
	21st to end	Day	24% 14% 4 8% 5% 3 5% 4 5% 6% 21%	1980
November	1st to 10th	Day	14% 12% 4 8% 7% 5% 4 5% 5% 7% 30%	1619
	11th to 20th	Day	15% 14% 5% 8% 7% 3 6% 5% 6% 7% 25%	1520
	21st to end	Day	18% 15% 7% 8% 8% 3 5% 4 5% 6% 20%	1520
December	1st to 10th	Day	15% 19% 8% 12% 8% 3 5% 5% 5% 5% 15%	1520
	11th to 20th	Day	18% 17% 5% 10% 7% 4 6% 4 5% 5% 18%	1906
	21st to end	Day	27% 20% 8% 13% 8% 4 4 3 2 3 8%	2772
January	1st to 10th	Night	16% 15% 8% 11% 9% 4 5% 4 5% 6% 17%	4427
	11th to 20th	Night	13% 12% 8% 14% 11% 8% 9% 7% 5% 4 10%	4120
	21st to end	Night	20% 14% 9% 11% 7% 3 4 4 4 5% 18%	4532
February	1st to 10th	Night	13% 14% 5% 11% 8% 4 7% 5% 5% 7% 21%	2470
	11th to 20th	Night	13% 12% 6% 12% 8% 3 6% 4 5% 6% 25%	2403
	21st to end	Night	14% 12% 5% 10% 7% 3 5% 6% 5% 6% 26%	1963
March	1st to 10th	Night	17% 10% 5% 8% 6% 3 6% 4 5% 6% 31%	3416
	11th to 20th	Night	11% 9% 5% 7% 5% 3 4 5% 6% 7% 37%	3479
	21st to end	Night	16% 8% 3 7% 5% 3 5% 4 5% 5% 40%	3817
April	1st to 10th	Night	19% 10% 5% 7% 6% 3 4 4 5% 7% 31%	1963
	11th to 20th	Night	14% 9% 3 6% 7% 4 4 4 5% 5% 38%	1687
	21st to end	Night	15% 10% 3 6% 6% 3 4 5% 5% 6% 36%	1620
May	1st to 10th	Night	17% 8% 2 5% 4 3 5% 5% 5% 6% 39%	1620
	11th to 20th	Night	15% 6% 2 5% 4 3 4 4 5% 7% 44%	1477
	21st to end	Night	9% 4 2 4 4 3 4 5% 5% 9% 51%	1550
June	1st to 10th	Night	11% 5% 2 5% 5% 3 4 6% 7% 9% 43%	1440
	11th to 20th	Night	10% 5% 3 5% 5% 3 5% 6% 7% 8% 44%	1374
	21st to end	Night	11% 5% 3 6% 5% 3 4 4 5% 7% 48%	1260
July	1st to 10th	Night	6% 3 2 4 4 2 4 4 4 10% 58%	1309
	11th to 20th	Night	9% 4 2 5% 5% 2 5% 4 5% 9% 49%	1466
	21st to end	Night	7% 4 2 5% 5% 3 4 5% 7% 8% 50%	1771
August	1st to 10th	Night	7% 5% 2 6% 5% 3 4 5% 6% 8% 50%	1611
	11th to 20th	Night	7% 5% 2 4 4 3 4 5% 6% 8% 52%	1598
	21st to end	Night	11% 5% 2 4 6% 3 5% 5% 5% 7% 46%	1836
September	1st to 10th	Night	10% 5% 3 4 6% 3 5% 5% 6% 8% 46%	1800
	11th to 20th	Night	11% 5% 3 3 4 2 4 4 5% 7% 53%	1944
	21st to end	Night	15% 7% 3 6% 6% 3 3 5% 5% 6% 41%	1991
October	1st to 10th	Night	16% 7% 3 7% 5% 3 5% 4 5% 7% 39%	2160
	11th to 20th	Night	18% 9% 3 7% 6% 3 5% 5% 5% 6% 33%	2160
	21st to end	Night	21% 10% 4 8% 6% 4 4 5% 5% 6% 28%	2376
November	1st to 10th	Night	15% 8% 3 6% 6% 3 5% 5% 5% 7% 37%	2454
	11th to 20th	Night	15% 11% 4 9% 7% 4 6% 6% 6% 7% 26%	2660
	21st to end	Night	18% 12% 5% 9% 7% 3 5% 4 5% 8% 25%	2660
December	1st to 10th	Night	18% 15% 6% 9% 6% 3 6% 5% 5% 6% 20%	2660
	11th to 20th	Night	16% 17% 6% 11% 6% 4 5% 5% 5% 6% 19%	3288
	21st to end	Night	26% 20% 8% 11% 7% 3 4 3 4 4 10%	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	62% 8% 11% 11% 8%	2518
	11th to 20th	Day	72% 6% 9% 8% 4	2840
	21st to end	Day	73% 6% 9% 7% 4 1	3124
February	1st to 10th	Day	66% 8% 9% 13% 3 1	1710
	11th to 20th	Day	60% 7% 10% 14% 8% 2	1672
	21st to end	Day	61% 6% 10% 14% 7% 1	1489
March	1st to 10th	Day	58% 6% 11% 17% 7% 1	3425
	11th to 20th	Day	53% 7% 13% 18% 7% 2	3480
	21st to end	Day	48% 7% 12% 19% 11% 2	3815
April	1st to 10th	Day	55% 6% 11% 16% 11% 1	2206
	11th to 20th	Day	48% 6% 11% 20% 14% 1	2235
	21st to end	Day	52% 6% 11% 18% 11% 2	2340
May	1st to 10th	Day	49% 6% 11% 21% 12% 1	2340
	11th to 20th	Day	45% 7% 10% 23% 12% 1	2418
	21st to end	Day	39% 8% 16% 22% 14% 2	2725
June	1st to 10th	Day	41% 8% 11% 23% 15% 1	2520
	11th to 20th	Day	39% 7% 14% 24% 15% 1	2578
	21st to end	Day	39% 8% 14% 24% 15%	2700
July	1st to 10th	Day	33% 9% 13% 25% 18% 3	2575
	11th to 20th	Day	37% 8% 16% 26% 11% 1	2416
	21st to end	Day	40% 9% 14% 22% 13% 2	2405
August	1st to 10th	Day	38% 10% 16% 24% 11% 2	2314
	11th to 20th	Day	40% 11% 16% 22% 11%	2303
	21st to end	Day	40% 8% 15% 25% 11% 1	2502
September	1st to 10th	Day	41% 8% 14% 26% 11% 1	2160
	11th to 20th	Day	37% 7% 13% 29% 13%	2013
	21st to end	Day	46% 9% 14% 23% 8% 1	1968
October	1st to 10th	Day	51% 7% 12% 18% 11% 1	1800
	11th to 20th	Day	55% 7% 12% 18% 7% 1	1800
	21st to end	Day	62% 8% 11% 13% 6% 1	1980
November	1st to 10th	Day	50% 7% 13% 20% 8% 1	1619
	11th to 20th	Day	54% 8% 15% 14% 8%	1520
	21st to end	Day	61% 8% 13% 13% 4	1520
December	1st to 10th	Day	67% 9% 10% 10% 4	1520
	11th to 20th	Day	66% 8% 11% 10% 5%	1906
	21st to end	Day	79% 7% 7% 7% 1	2772
January	1st to 10th	Night	62% 10% 11% 13% 4	4427
	11th to 20th	Night	69% 10% 10% 7% 3	4120
	21st to end	Night	66% 7% 11% 12% 4 1	4532
February	1st to 10th	Night	59% 8% 11% 16% 5% 1	2470
	11th to 20th	Night	58% 5% 12% 16% 9%	2405
	21st to end	Night	54% 8% 12% 17% 8%	1963
March	1st to 10th	Night	51% 7% 14% 21% 7% 1	3426
	11th to 20th	Night	43% 7% 17% 20% 12% 2	3480
	21st to end	Night	42% 6% 11% 22% 17% 2	3817
April	1st to 10th	Night	53% 6% 9% 17% 14% 1	1963
	11th to 20th	Night	46% 6% 10% 20% 16% 2	1687
	21st to end	Night	47% 6% 10% 20% 15% 2	1620
May	1st to 10th	Night	44% 7% 9% 23% 16% 2	1620
	11th to 20th	Night	39% 6% 12% 24% 15% 4	1478
	21st to end	Night	31% 7% 14% 26% 18% 4	1551
June	1st to 10th	Night	36% 8% 12% 25% 18% 1	1440
	11th to 20th	Night	36% 7% 12% 24% 19% 2	1374
	21st to end	Night	35% 6% 14% 27% 16% 1	1260
July	1st to 10th	Night	25% 7% 11% 27% 27% 4	1272
	11th to 20th	Night	31% 6% 13% 31% 17% 2	1418
	21st to end	Night	30% 9% 14% 28% 16% 3	1672
August	1st to 10th	Night	32% 7% 16% 31% 12% 2	1600
	11th to 20th	Night	26% 9% 16% 34% 14% 1	1598
	21st to end	Night	34% 7% 13% 29% 16% 1	1836
September	1st to 10th	Night	34% 8% 15% 28% 14% 1	1800
	11th to 20th	Night	30% 6% 11% 33% 18% 1	1944
	21st to end	Night	42% 7% 12% 28% 11% 1	1991
October	1st to 10th	Night	44% 8% 11% 22% 15% 1	2160
	11th to 20th	Night	49% 8% 12% 22% 9%	2160
	21st to end	Night	54% 8% 11% 17% 10% 1	2376
November	1st to 10th	Night	44% 7% 13% 22% 13% 1	2454
	11th to 20th	Night	52% 9% 15% 16% 8% 1	2660
	21st to end	Night	54% 10% 17% 14% 5%	2660
December	1st to 10th	Night	60% 11% 12% 13% 4	2660
	11th to 20th	Night	61% 10% 13% 12% 3	3288
	21st to end	Night	76% 7% 9% 6% 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	22% 27% 31% 16% 3 1	180
	11th to 20th	Day	23% 34% 29% 12% 2	270
	21st to end	Day	23% 30% 33% 12% 2	297
February	1st to 10th	Day	24% 35% 29% 10% 2	270
	11th to 20th	Day	22% 34% 36% 7%	270
	21st to end	Day	35% 28% 32% 5%	225
March	1st to 10th	Day	23% 23% 33% 17% 4	450
	11th to 20th	Day	22% 25% 35% 13% 4	460
	21st to end	Day	28% 20% 31% 16% 5% 1	506
April	1st to 10th	Day	21% 27% 32% 13% 6%	457
	11th to 20th	Day	26% 22% 28% 14% 7% 2	412
	21st to end	Day	25% 17% 34% 15% 7% 2	420
May	1st to 10th	Day	22% 17% 32% 16% 9% 4	423
	11th to 20th	Day	16% 14% 33% 22% 11% 3	447
	21st to end	Day	13% 11% 32% 26% 14% 5%	485
June	1st to 10th	Day	14% 14% 36% 26% 7% 2	450
	11th to 20th	Day	13% 16% 26% 30% 13% 2	508
	21st to end	Day	16% 10% 33% 29% 9% 3	630
July	1st to 10th	Day	8% 6% 31% 33% 17% 5%	570
	11th to 20th	Day	12% 8% 29% 26% 17% 7%	444
	21st to end	Day	10% 7% 34% 31% 13% 5%	488
August	1st to 10th	Day	9% 6% 29% 30% 19% 7%	446
	11th to 20th	Day	10% 6% 28% 28% 21% 8%	439
	21st to end	Day	14% 9% 27% 27% 17% 6%	495
September	1st to 10th	Day	13% 12% 25% 26% 17% 7%	450
	11th to 20th	Day	11% 8% 25% 26% 20% 10%	450
	21st to end	Day	16% 16% 26% 22% 14% 6%	450
October	1st to 10th	Day	23% 18% 25% 17% 12% 3	450
	11th to 20th	Day	24% 22% 34% 14% 6% 1	450
	21st to end	Day	30% 21% 28% 16% 5%	495
November	1st to 10th	Day	23% 24% 32% 16% 4 1	252
	11th to 20th	Day	22% 30% 30% 11% 6% 1	180
	21st to end	Day	24% 25% 39% 11% 1	180
December	1st to 10th	Day	30% 32% 25% 13% 1	180
	11th to 20th	Day	29% 31% 31% 9% 1	180
	21st to end	Day	29% 33% 27% 11% 1	198
January	1st to 10th	Night	21% 29% 33% 13% 3	760
	11th to 20th	Night	26% 24% 31% 16% 2	760
	21st to end	Night	17% 22% 37% 19% 5%	836
February	1st to 10th	Night	20% 30% 31% 17% 2	760
	11th to 20th	Night	21% 23% 36% 16% 3	743
	21st to end	Night	20% 27% 34% 17% 3	628
March	1st to 10th	Night	19% 21% 37% 19% 4	760
	11th to 20th	Night	21% 22% 35% 17% 5%	760
	21st to end	Night	20% 18% 34% 21% 6%	836
April	1st to 10th	Night	23% 18% 35% 21% 3	760
	11th to 20th	Night	18% 17% 35% 20% 8% 1	623
	21st to end	Night	18% 14% 34% 25% 9%	540
May	1st to 10th	Night	17% 12% 30% 26% 13% 2	540
	11th to 20th	Night	15% 9% 33% 30% 12% 1	416
	21st to end	Night	12% 8% 29% 35% 16% 1	389
June	1st to 10th	Night	11% 8% 34% 34% 12% 1	360
	11th to 20th	Night	12% 8% 33% 34% 13% 1	360
	21st to end	Night	11% 6% 31% 38% 13%	360
July	1st to 10th	Night	6% 5% 27% 41% 20% 1	350
	11th to 20th	Night	9% 5% 32% 34% 18% 1	374
	21st to end	Night	9% 4 29% 38% 19% 2	591
August	1st to 10th	Night	9% 2 26% 37% 23% 2	537
	11th to 20th	Night	7% 5% 21% 40% 25% 3	534
	21st to end	Night	14% 5% 29% 28% 22% 2	648
September	1st to 10th	Night	12% 9% 26% 32% 17% 5%	720
	11th to 20th	Night	12% 7% 26% 28% 21% 5%	720
	21st to end	Night	17% 13% 22% 26% 18% 5%	720
October	1st to 10th	Night	20% 11% 31% 22% 15% 3	720
	11th to 20th	Night	22% 18% 30% 23% 7% 1	720
	21st to end	Night	25% 19% 32% 20% 4	792
November	1st to 10th	Night	20% 16% 30% 24% 9% 1	740
	11th to 20th	Night	20% 23% 30% 20% 6% 1	760
	21st to end	Night	22% 24% 33% 18% 5%	760
December	1st to 10th	Night	27% 24% 31% 13% 4	760
	11th to 20th	Night	23% 26% 35% 13% 3	760
	21st to end	Night	29% 25% 28% 16% 2	836

Page generated at 2024-04-07 09:28:12. Version ac07

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