Bluerock Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bluerock Campground clear sky chart from 2005-11-06 to 2024-11-08.

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	6% 9% 3 8% 5% 5% 5% 4 7% 8% 38%	105623
	Night	3 8% 3 8% 5% 5% 5% 5% 7% 9% 42%	102060
Transparency	Day	39% 10% 16% 22% 11% 2	105374
	Night	34% 11% 18% 23% 12% 2	101955
Seeing	Day	14% 22% 31% 21% 9% 2	15314
	Night	9% 23% 33% 23% 9% 2	24343

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 3 13% 7% 6% 6% 6% 9% 12% 34%	2219
	11th to 20th	Day	6% 3 10% 4 6% 7% 5% 8% 11% 38%	2335
	21st to end	Day	1 6% 4 9% 5% 5% 6% 5% 8% 11% 40%	2794
February	1st to 10th	Day	1 6% 3 11% 8% 7% 6% 7% 8% 10% 34%	1520
	11th to 20th	Day	1 8% 4 10% 8% 6% 7% 6% 8% 11% 30%	1636
	21st to end	Day	1 6% 5% 15% 9% 7% 6% 5% 7% 9% 29%	1570
March	1st to 10th	Day	5% 3 11% 8% 8% 5% 5% 7% 10% 37%	3138
	11th to 20th	Day	1 10% 5% 7% 4 4 4 4 8% 9% 42%	3415
	21st to end	Day	2 15% 7% 21% 8% 4 5% 4 6% 6% 22%	3936
April	1st to 10th	Day	4 16% 6% 11% 6% 6% 6% 5% 8% 8% 25%	2300
	11th to 20th	Day	5% 18% 6% 12% 5% 5% 4 4 7% 8% 24%	2440
	21st to end	Day	7% 18% 6% 10% 5% 4 4 4 7% 7% 27%	2470
May	1st to 10th	Day	11% 24% 5% 8% 6% 5% 4 3 5% 5% 24%	4289
	11th to 20th	Day	7% 11% 3 8% 6% 6% 7% 6% 8% 9% 29%	4680
	21st to end	Day	14% 13% 3 8% 6% 6% 5% 5% 6% 9% 25%	5161
June	1st to 10th	Day	16% 12% 4 9% 6% 5% 6% 4 5% 7% 27%	2850
	11th to 20th	Day	19% 13% 4 9% 6% 6% 5% 4 6% 7% 22%	2850
	21st to end	Day	10% 8% 3 8% 6% 6% 5% 5% 7% 8% 34%	2850
July	1st to 10th	Day	8% 6% 3 6% 5% 5% 5% 4 6% 7% 45%	4740
	11th to 20th	Day	6% 4 1 5% 4 5% 5% 5% 8% 9% 48%	4740
	21st to end	Day	4 4 2 5% 4 5% 5% 4 5% 7% 56%	4901
August	1st to 10th	Day	11% 7% 3 7% 5% 5% 6% 4 7% 8% 38%	4401
	11th to 20th	Day	10% 5% 3 7% 5% 6% 5% 5% 6% 9% 41%	4095
	21st to end	Day	8% 6% 2 6% 4 4 5% 4 6% 8% 48%	4521
September	1st to 10th	Day	10% 8% 2 5% 3 5% 4 3 6% 6% 46%	2328
	11th to 20th	Day	11% 8% 2 7% 4 4 5% 4 6% 8% 42%	2097
	21st to end	Day	8% 9% 2 5% 4 4 5% 4 8% 9% 43%	2090
October	1st to 10th	Day	4 8% 3 5% 4 3 5% 4 5% 8% 51%	3399
	11th to 20th	Day	3 8% 3 7% 5% 4 5% 4 7% 9% 45%	2873
	21st to end	Day	3 8% 3 7% 4 5% 5% 4 6% 9% 46%	3101
November	1st to 10th	Day	3 10% 5% 10% 6% 6% 4 5% 7% 10% 35%	1665
	11th to 20th	Day	1 7% 2 7% 5% 4 4 4 9% 12% 44%	1435
	21st to end	Day	1 8% 3 9% 7% 6% 4 4 6% 11% 42%	1330
December	1st to 10th	Day	1 5% 4 9% 5% 5% 5% 6% 9% 11% 40%	1330
	11th to 20th	Day	6% 3 11% 6% 6% 6% 5% 8% 10% 39%	1682
	21st to end	Day	6% 4 9% 6% 6% 5% 3 6% 9% 45%	2442
January	1st to 10th	Night	1 5% 4 12% 7% 5% 6% 6% 9% 12% 33%	4726
	11th to 20th	Night	5% 4 10% 6% 5% 7% 6% 9% 10% 38%	4590
	21st to end	Night	1 8% 4 8% 6% 5% 6% 4 8% 11% 40%	4862
February	1st to 10th	Night	7% 3 9% 8% 6% 6% 7% 7% 11% 36%	2660
	11th to 20th	Night	8% 5% 11% 6% 5% 6% 6% 7% 10% 36%	2430
	21st to end	Night	1 6% 3 11% 8% 7% 7% 6% 7% 7% 37%	1884
March	1st to 10th	Night	4 3 11% 9% 6% 6% 6% 9% 10% 36%	3736
	11th to 20th	Night	1 8% 3 7% 5% 3 4 4 7% 9% 49%	3564
	21st to end	Night	1 15% 8% 16% 6% 4 4 4 6% 8% 28%	3715
April	1st to 10th	Night	4 13% 5% 10% 4 4 5% 4 6% 7% 36%	1879
	11th to 20th	Night	4 13% 6% 12% 4 4 4 4 6% 9% 35%	1691
	21st to end	Night	4 12% 5% 12% 5% 5% 4 4 6% 7% 35%	1710
May	1st to 10th	Night	10% 19% 5% 9% 5% 4 4 4 5% 6% 30%	2673
	11th to 20th	Night	5% 9% 3 8% 5% 6% 7% 6% 7% 8% 36%	2213
	21st to end	Night	11% 11% 4 9% 5% 6% 5% 4 5% 7% 33%	2414
June	1st to 10th	Night	11% 11% 4 7% 6% 5% 5% 3 6% 7% 34%	1330
	11th to 20th	Night	16% 11% 3 6% 6% 6% 5% 5% 5% 7% 31%	1330
	21st to end	Night	7% 5% 2 6% 4 4 5% 5% 7% 8% 48%	1330
July	1st to 10th	Night	5% 5% 2 6% 4 4 3 4 6% 7% 53%	2220
	11th to 20th	Night	4 4 2 5% 4 4 4 4 7% 8% 55%	2220
	21st to end	Night	5% 4 1 4 2 3 3 3 4 6% 64%	2635
August	1st to 10th	Night	10% 10% 3 6% 4 5% 5% 4 6% 8% 41%	2529
	11th to 20th	Night	5% 4 2 6% 4 4 5% 4 7% 9% 49%	2741
	21st to end	Night	7% 4 2 4 4 3 5% 4 8% 9% 51%	3146
September	1st to 10th	Night	10% 6% 2 5% 3 3 5% 3 6% 7% 51%	1851
	11th to 20th	Night	10% 8% 2 6% 3 4 4 4 5% 8% 47%	2082
	21st to end	Night	8% 9% 2 5% 3 3 4 4 5% 8% 49%	2090
October	1st to 10th	Night	4 7% 3 5% 3 3 4 3 6% 8% 53%	3577
	11th to 20th	Night	2 6% 2 5% 3 3 3 4 6% 11% 54%	4052
	21st to end	Night	2 6% 3 8% 4 4 5% 4 7% 9% 48%	4457
November	1st to 10th	Night	2 9% 5% 10% 5% 4 5% 4 7% 10% 39%	2555
	11th to 20th	Night	1 6% 3 7% 5% 4 4 5% 7% 12% 46%	2744
	21st to end	Night	1 7% 4 8% 6% 5% 5% 4 8% 10% 42%	2850
December	1st to 10th	Night	1 6% 3 9% 7% 5% 5% 5% 8% 11% 41%	2850
	11th to 20th	Night	1 5% 4 10% 7% 6% 6% 5% 9% 11% 36%	3510
	21st to end	Night	1 7% 3 10% 6% 6% 6% 5% 7% 8% 42%	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	36% 13% 18% 20% 10% 3	2219
	11th to 20th	Day	36% 10% 15% 19% 14% 6%	2357
	21st to end	Day	28% 17% 21% 25% 8% 1	2794
February	1st to 10th	Day	38% 12% 20% 18% 8% 4	1520
	11th to 20th	Day	41% 12% 18% 20% 8% 2	1645
	21st to end	Day	46% 12% 14% 17% 10% 1	1570
March	1st to 10th	Day	34% 13% 19% 19% 14% 2	3138
	11th to 20th	Day	31% 11% 25% 24% 8% 1	3416
	21st to end	Day	56% 12% 15% 10% 7%	3936
April	1st to 10th	Day	50% 12% 18% 14% 6%	2300
	11th to 20th	Day	53% 9% 14% 17% 6% 1	2440
	21st to end	Day	50% 10% 17% 17% 6% 1	2470
May	1st to 10th	Day	59% 8% 12% 18% 3	4289
	11th to 20th	Day	41% 12% 18% 23% 5%	4684
	21st to end	Day	50% 11% 17% 14% 7%	5162
June	1st to 10th	Day	54% 9% 13% 16% 8% 1	2850
	11th to 20th	Day	58% 9% 11% 14% 7% 1	2850
	21st to end	Day	42% 12% 15% 19% 11% 1	2850
July	1st to 10th	Day	33% 8% 12% 21% 21% 5%	4666
	11th to 20th	Day	27% 10% 13% 29% 18% 2	4659
	21st to end	Day	24% 7% 10% 23% 26% 10%	4746
August	1st to 10th	Day	38% 10% 13% 25% 12% 1	4384
	11th to 20th	Day	35% 12% 18% 26% 9% 1	4135
	21st to end	Day	30% 7% 15% 33% 13% 1	4520
September	1st to 10th	Day	35% 8% 14% 23% 16% 4	2328
	11th to 20th	Day	37% 9% 16% 23% 13% 2	2097
	21st to end	Day	33% 11% 17% 26% 12% 2	2090
October	1st to 10th	Day	30% 8% 17% 34% 9%	3399
	11th to 20th	Day	29% 10% 23% 20% 15% 3	2873
	21st to end	Day	33% 7% 15% 27% 14% 3	3101
November	1st to 10th	Day	42% 12% 17% 18% 9% 2	1665
	11th to 20th	Day	31% 10% 24% 23% 10% 2	1435
	21st to end	Day	36% 11% 21% 20% 7% 4	1330
December	1st to 10th	Day	34% 12% 22% 17% 12% 3	1330
	11th to 20th	Day	36% 13% 19% 22% 9% 1	1684
	21st to end	Day	31% 10% 15% 23% 16% 6%	2442
January	1st to 10th	Night	37% 16% 22% 17% 7% 2	4726
	11th to 20th	Night	35% 12% 16% 17% 11% 9%	4630
	21st to end	Night	33% 15% 22% 19% 10% 1	4862
February	1st to 10th	Night	39% 11% 17% 18% 11% 4	2660
	11th to 20th	Night	40% 10% 20% 18% 10% 2	2431
	21st to end	Night	41% 11% 14% 20% 13% 2	1884
March	1st to 10th	Night	32% 16% 18% 21% 12% 1	3736
	11th to 20th	Night	27% 12% 25% 26% 11% 1	3564
	21st to end	Night	52% 9% 17% 16% 5% 1	3715
April	1st to 10th	Night	44% 10% 18% 19% 9% 1	1879
	11th to 20th	Night	44% 10% 17% 20% 8% 1	1691
	21st to end	Night	45% 10% 15% 21% 7% 2	1710
May	1st to 10th	Night	51% 10% 11% 22% 5%	2673
	11th to 20th	Night	36% 15% 15% 29% 5%	2213
	21st to end	Night	46% 10% 18% 17% 10%	2414
June	1st to 10th	Night	45% 11% 15% 21% 8%	1330
	11th to 20th	Night	49% 10% 15% 17% 8% 1	1330
	21st to end	Night	30% 12% 19% 25% 13% 1	1330
July	1st to 10th	Night	28% 8% 16% 23% 19% 7%	2185
	11th to 20th	Night	23% 8% 17% 33% 17% 2	2178
	21st to end	Night	19% 7% 9% 29% 25% 11%	2551
August	1st to 10th	Night	35% 8% 15% 27% 13% 2	2521
	11th to 20th	Night	28% 9% 23% 29% 10% 1	2767
	21st to end	Night	25% 8% 22% 30% 14% 1	3146
September	1st to 10th	Night	30% 6% 19% 27% 15% 3	1851
	11th to 20th	Night	34% 9% 14% 26% 13% 3	2082
	21st to end	Night	32% 8% 20% 26% 13% 2	2090
October	1st to 10th	Night	27% 8% 13% 28% 22% 2	3577
	11th to 20th	Night	22% 8% 22% 27% 19% 2	4052
	21st to end	Night	29% 9% 15% 29% 18%	4457
November	1st to 10th	Night	40% 11% 18% 20% 9% 2	2555
	11th to 20th	Night	30% 13% 19% 24% 13% 1	2744
	21st to end	Night	34% 12% 21% 19% 10% 4	2850
December	1st to 10th	Night	36% 11% 19% 20% 11% 4	2850
	11th to 20th	Night	35% 15% 22% 20% 7% 1	3507
	21st to end	Night	32% 13% 16% 21% 11% 7%	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	3 26% 32% 26% 8% 5%	180
	11th to 20th	Day	6% 24% 39% 24% 6% 1	180
	21st to end	Day	4 33% 42% 13% 6% 3	198
February	1st to 10th	Day	8% 36% 33% 17% 5% 2	180
	11th to 20th	Day	6% 27% 39% 20% 7%	256
	21st to end	Day	8% 29% 30% 28% 5%	382
March	1st to 10th	Day	7% 35% 34% 17% 5% 2	460
	11th to 20th	Day	8% 28% 35% 22% 5% 2	460
	21st to end	Day	11% 30% 34% 16% 7% 2	506
April	1st to 10th	Day	12% 29% 35% 21% 4	460
	11th to 20th	Day	16% 22% 32% 20% 8% 2	452
	21st to end	Day	18% 26% 30% 15% 10% 2	460
May	1st to 10th	Day	18% 20% 25% 21% 12% 4	463
	11th to 20th	Day	20% 13% 22% 24% 17% 4	661
	21st to end	Day	24% 13% 22% 22% 16% 3	734
June	1st to 10th	Day	18% 18% 32% 21% 8% 2	680
	11th to 20th	Day	25% 22% 28% 17% 7% 1	680
	21st to end	Day	16% 16% 28% 25% 12% 4	680
July	1st to 10th	Day	12% 12% 32% 25% 16% 3	671
	11th to 20th	Day	12% 17% 30% 26% 12% 2	668
	21st to end	Day	8% 15% 35% 27% 12% 2	603
August	1st to 10th	Day	16% 14% 31% 29% 9% 2	487
	11th to 20th	Day	13% 15% 34% 26% 10% 3	477
	21st to end	Day	13% 22% 30% 23% 9% 2	539
September	1st to 10th	Day	15% 23% 33% 18% 9% 2	490
	11th to 20th	Day	16% 20% 33% 22% 7% 1	490
	21st to end	Day	19% 31% 30% 13% 6% 1	490
October	1st to 10th	Day	15% 22% 33% 19% 9% 1	438
	11th to 20th	Day	15% 26% 32% 18% 8% 2	300
	21st to end	Day	15% 31% 33% 14% 4 2	330
November	1st to 10th	Day	14% 30% 38% 11% 5% 1	291
	11th to 20th	Day	14% 34% 36% 11% 5%	230
	21st to end	Day	10% 29% 29% 18% 8% 6%	180
December	1st to 10th	Day	8% 27% 37% 19% 7% 2	180
	11th to 20th	Day	4 34% 38% 18% 4 1	180
	21st to end	Day	7% 23% 42% 18% 8% 3	198
January	1st to 10th	Night	8% 33% 39% 15% 4 1	950
	11th to 20th	Night	6% 31% 41% 17% 4 1	879
	21st to end	Night	6% 34% 35% 19% 5%	836
February	1st to 10th	Night	5% 29% 32% 21% 10% 3	760
	11th to 20th	Night	6% 27% 36% 24% 7%	744
	21st to end	Night	5% 23% 35% 23% 13% 1	628
March	1st to 10th	Night	4 24% 43% 20% 7% 2	760
	11th to 20th	Night	6% 27% 37% 23% 7% 1	760
	21st to end	Night	6% 20% 34% 27% 9% 3	836
April	1st to 10th	Night	9% 25% 27% 29% 8% 1	739
	11th to 20th	Night	11% 19% 33% 27% 8% 1	563
	21st to end	Night	12% 19% 34% 25% 9% 2	570
May	1st to 10th	Night	13% 14% 27% 32% 13% 2	461
	11th to 20th	Night	13% 11% 26% 29% 17% 3	374
	21st to end	Night	23% 10% 22% 27% 17% 2	411
June	1st to 10th	Night	19% 13% 26% 28% 12% 2	380
	11th to 20th	Night	23% 13% 24% 27% 12%	380
	21st to end	Night	11% 10% 29% 29% 19% 1	380
July	1st to 10th	Night	11% 6% 25% 39% 18% 1	370
	11th to 20th	Night	10% 7% 28% 36% 17% 2	368
	21st to end	Night	8% 9% 22% 37% 22% 2	416
August	1st to 10th	Night	13% 6% 19% 35% 25% 2	378
	11th to 20th	Night	11% 7% 23% 35% 21% 3	518
	21st to end	Night	11% 15% 24% 33% 15% 2	627
September	1st to 10th	Night	13% 12% 27% 28% 15% 5%	711
	11th to 20th	Night	15% 12% 28% 27% 13% 5%	760
	21st to end	Night	14% 21% 33% 21% 7% 4	760
October	1st to 10th	Night	13% 17% 33% 25% 10% 2	760
	11th to 20th	Night	11% 23% 33% 24% 8% 2	760
	21st to end	Night	9% 28% 35% 22% 5% 1	836
November	1st to 10th	Night	10% 29% 41% 14% 5%	823
	11th to 20th	Night	9% 36% 38% 14% 2 1	950
	21st to end	Night	7% 33% 37% 16% 5% 2	950
December	1st to 10th	Night	5% 32% 36% 18% 7% 2	950
	11th to 20th	Night	5% 32% 38% 19% 5% 1	950
	21st to end	Night	5% 30% 39% 19% 6% 1	1045

Page generated at 2024-11-05 06:15:53. Version ac07

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