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 2024-11-04.

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	15% 11% 4 9% 5% 5% 5% 4 6% 7% 31%	101896
	Night	14% 10% 4 9% 5% 5% 5% 4 5% 6% 33%	97114
Transparency	Day	49% 7% 13% 20% 10% 1	105501
	Night	47% 7% 12% 20% 11% 1	101599
Seeing	Day	19% 17% 31% 20% 10% 3	14806
	Night	18% 17% 31% 23% 10% 1	23863

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% 18% 8% 12% 6% 4 3 2 4 6% 22%	2517
	11th to 20th	Day	11% 20% 9% 19% 8% 4 4 4 5% 5% 11%	2840
	21st to end	Day	20% 19% 7% 14% 7% 5% 3 2 4 3 14%	3124
February	1st to 10th	Day	13% 18% 5% 15% 10% 5% 4 4 5% 4 17%	1710
	11th to 20th	Day	13% 13% 6% 14% 8% 5% 4 3 5% 6% 22%	1663
	21st to end	Day	17% 14% 6% 12% 7% 4 6% 2 3 5% 24%	1489
March	1st to 10th	Day	18% 14% 5% 11% 5% 5% 4 3 4 5% 28%	3422
	11th to 20th	Day	11% 15% 5% 10% 6% 5% 5% 4 5% 6% 28%	3480
	21st to end	Day	15% 12% 4 8% 4 5% 5% 4 5% 6% 32%	3815
April	1st to 10th	Day	17% 15% 4 9% 5% 5% 3 4 5% 7% 27%	2216
	11th to 20th	Day	19% 10% 2 8% 5% 4 4 3 4 6% 35%	2361
	21st to end	Day	20% 10% 3 8% 5% 4 4 3 4 6% 32%	2470
May	1st to 10th	Day	18% 9% 3 8% 4 4 4 4 5% 7% 33%	4108
	11th to 20th	Day	15% 10% 3 9% 6% 5% 5% 4 6% 8% 30%	4292
	21st to end	Day	12% 6% 2 7% 4 4 4 4 5% 8% 45%	4837
June	1st to 10th	Day	14% 7% 2 7% 5% 4 5% 4 6% 8% 36%	2660
	11th to 20th	Day	12% 6% 2 8% 5% 4 5% 4 7% 9% 39%	2722
	21st to end	Day	14% 6% 2 6% 6% 5% 5% 5% 6% 8% 38%	2850
July	1st to 10th	Day	10% 5% 2 6% 5% 4 5% 5% 7% 10% 39%	4664
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 8% 10% 42%	4383
	21st to end	Day	9% 5% 3 6% 5% 5% 5% 5% 7% 9% 41%	4466
August	1st to 10th	Day	17% 7% 2 6% 4 5% 5% 4 7% 9% 35%	4104
	11th to 20th	Day	11% 7% 3 8% 6% 5% 6% 4 7% 10% 32%	4044
	21st to end	Day	9% 6% 2 7% 5% 5% 6% 4 7% 9% 40%	4404
September	1st to 10th	Day	12% 6% 2 7% 5% 5% 5% 4 5% 8% 40%	2280
	11th to 20th	Day	12% 7% 2 6% 4 4 4 4 5% 9% 43%	2124
	21st to end	Day	15% 8% 2 7% 6% 5% 5% 4 5% 8% 34%	2077
October	1st to 10th	Day	18% 10% 3 8% 5% 4 4 3 5% 6% 33%	1900
	11th to 20th	Day	21% 10% 4 9% 5% 5% 4 4 5% 5% 29%	1900
	21st to end	Day	23% 14% 4 8% 5% 4 5% 3 5% 6% 22%	2090
November	1st to 10th	Day	14% 12% 4 8% 6% 6% 4 4 5% 6% 30%	1646
	11th to 20th	Day	14% 15% 4 9% 6% 5% 6% 3 6% 6% 25%	1520
	21st to end	Day	18% 16% 7% 9% 7% 5% 5% 3 5% 6% 20%	1520
December	1st to 10th	Day	15% 20% 7% 13% 7% 5% 5% 4 5% 5% 15%	1520
	11th to 20th	Day	18% 18% 5% 12% 6% 6% 4 3 5% 5% 18%	1906
	21st to end	Day	26% 21% 7% 15% 6% 4 4 3 2 3 8%	2772
January	1st to 10th	Night	16% 16% 7% 12% 7% 5% 5% 3 5% 6% 17%	4427
	11th to 20th	Night	13% 13% 7% 16% 9% 10% 8% 5% 5% 4 10%	4120
	21st to end	Night	20% 14% 9% 12% 6% 4 4 3 4 5% 18%	4532
February	1st to 10th	Night	13% 15% 5% 12% 7% 6% 6% 4 5% 7% 20%	2470
	11th to 20th	Night	12% 13% 5% 13% 7% 5% 5% 4 5% 6% 25%	2403
	21st to end	Night	14% 13% 5% 11% 6% 4 5% 5% 6% 6% 26%	1963
March	1st to 10th	Night	17% 10% 4 9% 5% 5% 5% 4 5% 6% 31%	3416
	11th to 20th	Night	11% 9% 4 8% 5% 4 4 4 6% 7% 37%	3479
	21st to end	Night	16% 8% 3 8% 4 5% 4 3 5% 5% 40%	3817
April	1st to 10th	Night	19% 11% 4 7% 5% 4 4 4 5% 7% 31%	1963
	11th to 20th	Night	15% 10% 3 7% 6% 4 4 3 5% 6% 37%	1782
	21st to end	Night	15% 10% 3 7% 5% 4 5% 4 5% 6% 36%	1710
May	1st to 10th	Night	17% 7% 2 7% 4 4 5% 3 5% 6% 40%	2833
	11th to 20th	Night	14% 10% 3 8% 5% 5% 4 4 5% 7% 35%	2599
	21st to end	Night	9% 5% 2 5% 4 3 5% 4 5% 9% 50%	2738
June	1st to 10th	Night	11% 6% 2 6% 5% 4 4 5% 7% 8% 42%	1520
	11th to 20th	Night	10% 5% 3 6% 4 4 5% 5% 8% 8% 43%	1450
	21st to end	Night	11% 6% 2 7% 4 4 4 4 5% 7% 47%	1330
July	1st to 10th	Night	6% 5% 2 5% 4 4 4 4 6% 10% 52%	2298
	11th to 20th	Night	10% 4 2 5% 4 4 4 3 5% 8% 51%	2574
	21st to end	Night	6% 5% 2 5% 4 4 4 4 7% 8% 50%	3087
August	1st to 10th	Night	10% 5% 2 7% 4 4 4 3 5% 7% 47%	2825
	11th to 20th	Night	11% 6% 2 5% 3 4 4 4 6% 8% 47%	2785
	21st to end	Night	10% 5% 2 6% 4 4 4 4 5% 7% 48%	3220
September	1st to 10th	Night	10% 5% 2 5% 5% 4 4 4 6% 7% 47%	1900
	11th to 20th	Night	10% 5% 2 4 4 3 3 3 5% 7% 54%	2052
	21st to end	Night	16% 8% 3 7% 5% 4 4 4 5% 6% 40%	2102
October	1st to 10th	Night	15% 7% 3 7% 4 4 4 3 5% 7% 40%	2280
	11th to 20th	Night	17% 10% 3 8% 5% 5% 5% 4 5% 6% 34%	2280
	21st to end	Night	19% 10% 3 9% 5% 5% 4 4 5% 6% 29%	2508
November	1st to 10th	Night	14% 9% 3 7% 5% 5% 4 4 5% 7% 37%	2499
	11th to 20th	Night	15% 12% 3 10% 5% 5% 5% 5% 6% 7% 26%	2660
	21st to end	Night	17% 13% 4 9% 6% 4 5% 4 6% 7% 25%	2660
December	1st to 10th	Night	18% 16% 6% 10% 6% 5% 5% 4 5% 6% 19%	2660
	11th to 20th	Night	15% 18% 5% 12% 5% 5% 5% 4 5% 6% 19%	3288
	21st to end	Night	26% 21% 7% 13% 5% 4 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	2216
	11th to 20th	Day	48% 6% 11% 20% 14% 1	2361
	21st to end	Day	52% 6% 11% 18% 12% 2	2470
May	1st to 10th	Day	47% 6% 13% 19% 12% 2	4120
	11th to 20th	Day	49% 9% 13% 21% 7% 1	4296
	21st to end	Day	36% 7% 13% 22% 18% 4	4837
June	1st to 10th	Day	42% 8% 11% 22% 15% 1	2660
	11th to 20th	Day	39% 7% 14% 24% 15% 1	2722
	21st to end	Day	40% 8% 14% 23% 15%	2850
July	1st to 10th	Day	37% 6% 16% 24% 15% 2	4593
	11th to 20th	Day	33% 6% 15% 34% 11% 1	4308
	21st to end	Day	37% 8% 15% 23% 17% 1	4324
August	1st to 10th	Day	43% 7% 13% 23% 13% 1	4091
	11th to 20th	Day	43% 8% 16% 24% 9%	4083
	21st to end	Day	37% 7% 15% 31% 9% 1	4404
September	1st to 10th	Day	41% 7% 14% 26% 11% 1	2280
	11th to 20th	Day	36% 7% 13% 29% 14%	2124
	21st to end	Day	47% 8% 13% 23% 8% 1	2077
October	1st to 10th	Day	43% 5% 13% 25% 13% 1	3160
	11th to 20th	Day	43% 4 14% 21% 16%	3140
	21st to end	Day	55% 5% 13% 20% 7%	3428
November	1st to 10th	Day	50% 7% 14% 20% 7% 1	1646
	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	52% 6% 9% 18% 14% 1	1963
	11th to 20th	Night	46% 6% 10% 20% 16% 2	1782
	21st to end	Night	46% 6% 10% 19% 16% 2	1710
May	1st to 10th	Night	43% 7% 11% 19% 16% 4	2840
	11th to 20th	Night	44% 9% 15% 20% 9% 2	2600
	21st to end	Night	30% 8% 13% 23% 23% 3	2739
June	1st to 10th	Night	37% 8% 12% 25% 18% 1	1520
	11th to 20th	Night	36% 6% 13% 24% 19% 2	1450
	21st to end	Night	36% 6% 13% 27% 17% 1	1330
July	1st to 10th	Night	28% 6% 14% 25% 22% 4	2261
	11th to 20th	Night	30% 4 13% 34% 17% 1	2526
	21st to end	Night	30% 7% 16% 29% 16% 2	2988
August	1st to 10th	Night	37% 5% 13% 28% 15% 3	2814
	11th to 20th	Night	33% 6% 16% 31% 12% 1	2812
	21st to end	Night	34% 5% 13% 32% 15% 1	3220
September	1st to 10th	Night	33% 8% 14% 29% 15% 1	1900
	11th to 20th	Night	29% 6% 11% 33% 20% 1	2052
	21st to end	Night	43% 6% 12% 27% 11% 1	2102
October	1st to 10th	Night	34% 5% 9% 27% 24% 1	3800
	11th to 20th	Night	45% 5% 11% 24% 15%	3779
	21st to end	Night	42% 5% 15% 26% 11% 1	4120
November	1st to 10th	Night	44% 7% 13% 22% 13% 1	2499
	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	22% 27% 32% 13% 6%	460
	11th to 20th	Day	30% 21% 28% 13% 6% 2	452
	21st to end	Day	25% 18% 34% 15% 7% 2	460
May	1st to 10th	Day	22% 17% 31% 18% 8% 3	463
	11th to 20th	Day	16% 13% 33% 23% 11% 3	487
	21st to end	Day	12% 13% 32% 25% 13% 5%	529
June	1st to 10th	Day	14% 15% 35% 26% 7% 2	490
	11th to 20th	Day	13% 16% 28% 30% 12% 2	552
	21st to end	Day	16% 12% 34% 27% 8% 3	680
July	1st to 10th	Day	10% 7% 32% 31% 16% 5%	617
	11th to 20th	Day	12% 8% 31% 26% 17% 7%	484
	21st to end	Day	10% 7% 33% 31% 14% 5%	532
August	1st to 10th	Day	12% 6% 29% 28% 18% 7%	486
	11th to 20th	Day	10% 8% 27% 27% 19% 9%	479
	21st to end	Day	14% 8% 27% 28% 17% 6%	539
September	1st to 10th	Day	12% 14% 25% 25% 16% 8%	490
	11th to 20th	Day	10% 7% 24% 26% 21% 12%	490
	21st to end	Day	18% 14% 26% 22% 14% 5%	490
October	1st to 10th	Day	23% 18% 27% 18% 12% 3	490
	11th to 20th	Day	23% 21% 34% 13% 7% 1	490
	21st to end	Day	29% 20% 29% 16% 5%	539
November	1st to 10th	Day	23% 25% 31% 16% 4 1	261
	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	22% 18% 35% 22% 3	760
	11th to 20th	Night	19% 17% 35% 20% 8% 1	658
	21st to end	Night	19% 14% 34% 24% 9%	570
May	1st to 10th	Night	17% 12% 31% 27% 12% 2	570
	11th to 20th	Night	15% 9% 32% 30% 13% 1	439
	21st to end	Night	12% 8% 28% 35% 16%	411
June	1st to 10th	Night	12% 8% 33% 33% 12% 1	380
	11th to 20th	Night	11% 8% 32% 36% 12% 1	380
	21st to end	Night	12% 7% 31% 37% 13%	380
July	1st to 10th	Night	6% 5% 28% 41% 19% 1	370
	11th to 20th	Night	9% 5% 31% 34% 19% 1	396
	21st to end	Night	9% 4 28% 38% 20% 2	624
August	1st to 10th	Night	10% 2 26% 37% 23% 2	567
	11th to 20th	Night	8% 5% 21% 38% 25% 3	564
	21st to end	Night	14% 5% 27% 30% 22% 2	684
September	1st to 10th	Night	12% 9% 26% 31% 18% 4	760
	11th to 20th	Night	12% 7% 24% 28% 24% 6%	760
	21st to end	Night	19% 12% 21% 26% 18% 4	760
October	1st to 10th	Night	19% 11% 31% 23% 14% 3	760
	11th to 20th	Night	21% 18% 29% 23% 8% 1	760
	21st to end	Night	24% 19% 32% 21% 4	836
November	1st to 10th	Night	21% 16% 29% 25% 8% 1	755
	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 2024-11-01 22:47:32. Version ac07

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