Woodland Altars Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Woodland Altars Campground clear sky chart from 2005-11-06 to 2024-12-02.

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% 9% 3 7% 5% 4 4 4 5% 7% 36%	101372
	Night	15% 10% 3 7% 4 4 4 3 5% 7% 37%	98239
Transparency	Day	45% 7% 11% 22% 14% 2	105077
	Night	44% 6% 11% 21% 15% 2	102672
Seeing	Day	22% 14% 27% 21% 12% 5%	14894
	Night	20% 11% 25% 27% 15% 2	24976

By Month

Percentage Cloud Cover SE (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	17% 19% 6% 10% 5% 4 4 3 4 6% 23%	2836
	11th to 20th	Day	16% 17% 8% 12% 5% 6% 4 2 3 4 22%	2840
	21st to end	Day	28% 18% 8% 6% 4 4 4 2 4 4 18%	3124
February	1st to 10th	Day	20% 13% 5% 9% 5% 3 4 3 5% 5% 28%	1748
	11th to 20th	Day	18% 13% 4 10% 6% 4 4 3 5% 5% 28%	1848
	21st to end	Day	21% 14% 5% 7% 4 3 3 2 3 6% 31%	1570
March	1st to 10th	Day	22% 15% 5% 9% 5% 4 3 3 4 5% 26%	3238
	11th to 20th	Day	15% 8% 3 7% 4 4 4 4 6% 7% 39%	3480
	21st to end	Day	18% 10% 3 6% 5% 4 4 3 5% 6% 35%	3815
April	1st to 10th	Day	14% 11% 4 7% 4 4 4 3 5% 6% 37%	2155
	11th to 20th	Day	18% 8% 3 6% 4 4 3 3 5% 7% 39%	2357
	21st to end	Day	18% 7% 3 7% 6% 5% 4 3 5% 6% 35%	2470
May	1st to 10th	Day	22% 10% 3 7% 4 4 4 4 5% 6% 31%	4082
	11th to 20th	Day	21% 9% 3 6% 4 4 4 4 5% 6% 33%	4081
	21st to end	Day	11% 6% 3 8% 5% 6% 6% 5% 7% 9% 35%	4476
June	1st to 10th	Day	12% 5% 2 6% 5% 5% 5% 5% 7% 9% 39%	2470
	11th to 20th	Day	10% 6% 2 6% 5% 5% 5% 5% 6% 9% 41%	2470
	21st to end	Day	10% 5% 2 6% 5% 5% 6% 5% 7% 9% 39%	2470
July	1st to 10th	Day	13% 6% 2 7% 5% 5% 5% 4 6% 8% 40%	4120
	11th to 20th	Day	9% 5% 2 5% 4 5% 5% 4 7% 11% 43%	4120
	21st to end	Day	13% 8% 3 8% 6% 6% 6% 5% 7% 8% 30%	4466
August	1st to 10th	Day	8% 5% 2 7% 4 5% 5% 5% 7% 11% 40%	4104
	11th to 20th	Day	8% 6% 2 6% 5% 5% 5% 5% 8% 9% 39%	4044
	21st to end	Day	6% 3 1 5% 4 4 4 4 6% 8% 55%	4349
September	1st to 10th	Day	14% 5% 2 5% 4 4 4 3 5% 6% 47%	2109
	11th to 20th	Day	9% 5% 2 5% 4 4 6% 4 5% 7% 50%	2090
	21st to end	Day	19% 6% 3 6% 4 3 4 3 5% 6% 44%	2090
October	1st to 10th	Day	13% 5% 2 5% 3 3 5% 4 5% 8% 48%	2067
	11th to 20th	Day	14% 8% 2 5% 4 3 5% 3 4 7% 46%	1900
	21st to end	Day	21% 9% 2 6% 4 3 3 3 4 6% 40%	2025
November	1st to 10th	Day	12% 7% 2 5% 4 3 4 4 5% 5% 50%	1762
	11th to 20th	Day	16% 13% 4 6% 4 3 3 3 5% 6% 37%	1800
	21st to end	Day	18% 12% 4 7% 4 4 4 3 4 5% 36%	1800
December	1st to 10th	Day	22% 16% 4 9% 5% 5% 3 3 4 5% 24%	1719
	11th to 20th	Day	17% 16% 6% 9% 4 4 5% 4 5% 6% 26%	2153
	21st to end	Day	20% 21% 5% 10% 5% 4 4 3 4 5% 18%	3124
January	1st to 10th	Night	16% 20% 7% 11% 5% 4 4 3 5% 4 20%	4109
	11th to 20th	Night	16% 17% 6% 14% 5% 3 3 3 4 4 23%	4120
	21st to end	Night	26% 16% 7% 8% 5% 5% 3 2 3 3 22%	4532
February	1st to 10th	Night	21% 14% 4 8% 5% 3 3 3 4 5% 28%	2431
	11th to 20th	Night	19% 12% 3 9% 5% 4 4 3 4 6% 30%	2218
	21st to end	Night	23% 16% 4 7% 4 3 3 3 4 5% 29%	1884
March	1st to 10th	Night	20% 13% 3 6% 5% 4 4 3 4 5% 32%	3615
	11th to 20th	Night	13% 10% 3 6% 4 3 3 4 5% 7% 41%	3480
	21st to end	Night	17% 8% 3 7% 5% 5% 4 3 5% 6% 39%	3817
April	1st to 10th	Night	15% 9% 2 6% 5% 5% 4 4 6% 8% 37%	2041
	11th to 20th	Night	14% 8% 2 6% 4 5% 4 4 6% 6% 40%	1770
	21st to end	Night	17% 7% 3 6% 5% 4 4 4 6% 7% 38%	1710
May	1st to 10th	Night	26% 10% 3 7% 4 3 4 3 5% 6% 29%	2813
	11th to 20th	Night	19% 7% 3 5% 4 3 3 3 6% 8% 39%	2812
	21st to end	Night	10% 5% 2 5% 4 4 5% 4 7% 10% 44%	3079
June	1st to 10th	Night	8% 5% 2 6% 4 5% 5% 4 6% 9% 46%	1710
	11th to 20th	Night	8% 3 2 5% 4 4 5% 4 7% 12% 47%	1710
	21st to end	Night	8% 4 2 5% 3 3 5% 4 9% 10% 45%	1710
July	1st to 10th	Night	10% 6% 2 5% 4 4 4 4 6% 8% 47%	2840
	11th to 20th	Night	8% 5% 2 5% 5% 4 4 4 6% 10% 48%	2840
	21st to end	Night	10% 7% 3 9% 5% 6% 4 4 6% 8% 39%	3087
August	1st to 10th	Night	7% 6% 2 6% 5% 5% 4 4 6% 9% 45%	2825
	11th to 20th	Night	10% 7% 3 7% 4 5% 4 4 5% 8% 43%	2785
	21st to end	Night	4 3 2 4 3 3 5% 4 7% 10% 56%	3303
September	1st to 10th	Night	12% 5% 2 5% 4 3 3 3 5% 7% 51%	2052
	11th to 20th	Night	9% 4 2 4 4 4 4 3 4 7% 54%	2090
	21st to end	Night	14% 5% 2 6% 4 4 4 3 5% 5% 48%	2090
October	1st to 10th	Night	9% 5% 2 6% 3 3 4 3 5% 6% 53%	2111
	11th to 20th	Night	15% 7% 2 4 4 4 4 3 5% 7% 46%	2280
	21st to end	Night	19% 8% 2 5% 4 4 4 3 4 5% 42%	2570
November	1st to 10th	Night	14% 7% 2 5% 4 3 3 3 4 6% 48%	2536
	11th to 20th	Night	16% 11% 3 6% 5% 4 4 3 4 6% 39%	2600
	21st to end	Night	20% 13% 3 6% 5% 4 4 3 4 6% 33%	2600
December	1st to 10th	Night	21% 14% 5% 7% 4 4 4 3 4 6% 27%	2495
	11th to 20th	Night	18% 13% 7% 8% 4 3 4 3 5% 5% 30%	3042
	21st to end	Night	20% 20% 6% 9% 6% 5% 4 3 4 5% 18%	4532

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	61% 6% 12% 13% 8%	2837
	11th to 20th	Day	65% 5% 9% 15% 5%	2840
	21st to end	Day	70% 5% 8% 13% 3 1	3124
February	1st to 10th	Day	58% 5% 11% 16% 9% 1	1748
	11th to 20th	Day	57% 5% 10% 17% 10% 1	1858
	21st to end	Day	56% 5% 9% 20% 9% 2	1570
March	1st to 10th	Day	58% 6% 9% 19% 7% 1	3238
	11th to 20th	Day	41% 7% 11% 24% 15% 1	3480
	21st to end	Day	47% 7% 10% 23% 12% 1	3815
April	1st to 10th	Day	45% 7% 11% 23% 11% 2	2155
	11th to 20th	Day	44% 6% 10% 21% 15% 4	2357
	21st to end	Day	49% 7% 11% 20% 11% 2	2470
May	1st to 10th	Day	51% 8% 12% 21% 7% 1	4120
	11th to 20th	Day	48% 8% 12% 19% 12% 1	4085
	21st to end	Day	38% 12% 15% 16% 16% 2	4489
June	1st to 10th	Day	39% 9% 13% 22% 15% 2	2470
	11th to 20th	Day	37% 10% 15% 21% 16% 1	2470
	21st to end	Day	38% 9% 14% 23% 13% 3	2470
July	1st to 10th	Day	42% 6% 11% 22% 17% 2	4055
	11th to 20th	Day	34% 7% 12% 31% 16% 1	4051
	21st to end	Day	50% 6% 12% 16% 13% 2	4324
August	1st to 10th	Day	36% 8% 14% 32% 10% 1	4091
	11th to 20th	Day	37% 6% 11% 29% 16% 1	4083
	21st to end	Day	26% 6% 16% 29% 20% 3	4348
September	1st to 10th	Day	36% 7% 11% 22% 19% 6%	2109
	11th to 20th	Day	33% 7% 12% 22% 23% 3	2090
	21st to end	Day	42% 5% 9% 22% 19% 2	2090
October	1st to 10th	Day	23% 5% 9% 30% 32% 2	3431
	11th to 20th	Day	30% 4 9% 30% 26% 2	3140
	21st to end	Day	35% 3 10% 26% 22% 3	3314
November	1st to 10th	Day	36% 5% 11% 27% 19% 3	1762
	11th to 20th	Day	48% 4 8% 21% 16% 3	1800
	21st to end	Day	50% 5% 10% 20% 13% 1	1800
December	1st to 10th	Day	62% 6% 10% 17% 5%	1719
	11th to 20th	Day	56% 8% 9% 16% 10%	2150
	21st to end	Day	67% 7% 9% 10% 6% 1	3124
January	1st to 10th	Night	64% 8% 7% 13% 7%	4109
	11th to 20th	Night	64% 6% 10% 14% 7% 1	4120
	21st to end	Night	64% 6% 8% 15% 5% 1	4532
February	1st to 10th	Night	58% 5% 10% 18% 8% 1	2431
	11th to 20th	Night	56% 4 9% 19% 12% 1	2219
	21st to end	Night	58% 5% 10% 15% 9% 3	1884
March	1st to 10th	Night	52% 6% 8% 22% 10% 1	3615
	11th to 20th	Night	39% 7% 11% 27% 15% 1	3480
	21st to end	Night	44% 8% 9% 26% 13% 1	3817
April	1st to 10th	Night	43% 7% 11% 22% 14% 2	2041
	11th to 20th	Night	41% 7% 11% 18% 18% 6%	1770
	21st to end	Night	45% 7% 11% 20% 14% 3	1710
May	1st to 10th	Night	55% 8% 9% 18% 8% 2	2840
	11th to 20th	Night	43% 9% 14% 23% 10% 1	2813
	21st to end	Night	30% 11% 17% 24% 14% 5%	3087
June	1st to 10th	Night	32% 9% 14% 24% 19% 2	1710
	11th to 20th	Night	29% 9% 17% 21% 21% 3	1710
	21st to end	Night	30% 10% 17% 24% 16% 4	1710
July	1st to 10th	Night	35% 6% 13% 24% 18% 5%	2795
	11th to 20th	Night	30% 7% 13% 30% 18% 1	2786
	21st to end	Night	42% 7% 13% 21% 13% 4	2988
August	1st to 10th	Night	35% 6% 14% 32% 11% 1	2814
	11th to 20th	Night	39% 7% 10% 24% 18% 1	2812
	21st to end	Night	22% 7% 17% 29% 21% 3	3303
September	1st to 10th	Night	32% 7% 13% 23% 19% 7%	2052
	11th to 20th	Night	29% 8% 11% 22% 27% 3	2090
	21st to end	Night	37% 6% 9% 20% 26% 1	2090
October	1st to 10th	Night	24% 5% 8% 25% 35% 3	3527
	11th to 20th	Night	28% 4 9% 26% 29% 5%	3779
	21st to end	Night	33% 3 9% 22% 26% 7%	4231
November	1st to 10th	Night	37% 3 11% 23% 22% 3	2536
	11th to 20th	Night	47% 4 8% 20% 18% 4	2600
	21st to end	Night	52% 5% 10% 20% 11% 2	2600
December	1st to 10th	Night	59% 5% 9% 18% 7% 1	2495
	11th to 20th	Night	54% 6% 10% 20% 9% 1	3044
	21st to end	Night	66% 7% 9% 13% 5%	4532

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	31% 23% 30% 12% 3	270
	11th to 20th	Day	36% 25% 32% 7% 1	270
	21st to end	Day	36% 24% 27% 10% 3	297
February	1st to 10th	Day	33% 25% 29% 12% 2	270
	11th to 20th	Day	36% 29% 30% 3 1	270
	21st to end	Day	38% 23% 33% 5%	225
March	1st to 10th	Day	32% 24% 27% 14% 3	336
	11th to 20th	Day	28% 23% 31% 13% 4	460
	21st to end	Day	34% 20% 26% 16% 4	506
April	1st to 10th	Day	25% 20% 30% 15% 8% 1	460
	11th to 20th	Day	27% 20% 28% 13% 9% 2	452
	21st to end	Day	27% 17% 35% 12% 7% 2	460
May	1st to 10th	Day	28% 16% 31% 15% 7% 3	463
	11th to 20th	Day	22% 10% 33% 20% 11% 4	487
	21st to end	Day	14% 10% 26% 28% 16% 5%	529
June	1st to 10th	Day	16% 10% 24% 29% 15% 7%	490
	11th to 20th	Day	14% 8% 25% 31% 16% 6%	490
	21st to end	Day	12% 10% 31% 24% 15% 8%	490
July	1st to 10th	Day	16% 6% 18% 24% 17% 20%	485
	11th to 20th	Day	9% 6% 25% 29% 21% 11%	484
	21st to end	Day	14% 2 23% 30% 19% 13%	532
August	1st to 10th	Day	10% 4 20% 29% 23% 13%	486
	11th to 20th	Day	13% 5% 22% 34% 18% 9%	479
	21st to end	Day	9% 4 18% 33% 24% 12%	539
September	1st to 10th	Day	13% 5% 19% 29% 23% 11%	490
	11th to 20th	Day	11% 2 19% 28% 29% 11%	490
	21st to end	Day	24% 9% 18% 24% 21% 4	490
October	1st to 10th	Day	13% 8% 27% 30% 16% 7%	490
	11th to 20th	Day	20% 14% 32% 18% 11% 5%	490
	21st to end	Day	25% 16% 31% 22% 6%	474
November	1st to 10th	Day	18% 19% 34% 20% 7% 2	300
	11th to 20th	Day	29% 17% 32% 17% 4 2	300
	21st to end	Day	29% 22% 33% 13% 3	300
December	1st to 10th	Day	34% 19% 31% 11% 5%	273
	11th to 20th	Day	27% 23% 34% 12% 3	270
	21st to end	Day	34% 24% 28% 11% 3	297
January	1st to 10th	Night	29% 21% 28% 18% 5%	760
	11th to 20th	Night	31% 22% 28% 16% 2	760
	21st to end	Night	28% 20% 29% 21% 2	836
February	1st to 10th	Night	32% 16% 29% 21% 2	760
	11th to 20th	Night	30% 22% 29% 17% 1	743
	21st to end	Night	32% 18% 31% 18% 1	628
March	1st to 10th	Night	24% 20% 28% 24% 4	760
	11th to 20th	Night	26% 18% 30% 20% 6%	760
	21st to end	Night	24% 14% 31% 24% 7%	836
April	1st to 10th	Night	21% 15% 33% 23% 7%	711
	11th to 20th	Night	17% 14% 34% 23% 12% 1	563
	21st to end	Night	21% 11% 35% 27% 6% 1	570
May	1st to 10th	Night	22% 11% 29% 25% 12% 1	570
	11th to 20th	Night	19% 9% 26% 28% 18% 1	561
	21st to end	Night	8% 5% 23% 33% 27% 4	617
June	1st to 10th	Night	9% 3 25% 39% 22% 2	570
	11th to 20th	Night	9% 4 20% 39% 25% 4	570
	21st to end	Night	9% 4 25% 34% 26% 3	570
July	1st to 10th	Night	15% 1 14% 31% 30% 10%	555
	11th to 20th	Night	7% 2 16% 36% 34% 5%	552
	21st to end	Night	9% 3 14% 35% 35% 4	624
August	1st to 10th	Night	9% 2 11% 40% 33% 5%	567
	11th to 20th	Night	8% 3 13% 39% 30% 7%	564
	21st to end	Night	8% 1 16% 34% 34% 7%	627
September	1st to 10th	Night	13% 4 13% 33% 31% 6%	722
	11th to 20th	Night	10% 4 15% 32% 33% 6%	760
	21st to end	Night	15% 7% 19% 34% 24% 3	760
October	1st to 10th	Night	11% 7% 23% 32% 23% 4	760
	11th to 20th	Night	19% 11% 26% 30% 14% 1	760
	21st to end	Night	24% 13% 26% 26% 11% 1	836
November	1st to 10th	Night	19% 11% 25% 27% 17% 1	780
	11th to 20th	Night	24% 16% 25% 24% 10% 1	800
	21st to end	Night	28% 14% 26% 25% 7% 1	800
December	1st to 10th	Night	31% 17% 27% 20% 5%	768
	11th to 20th	Night	28% 15% 28% 22% 6% 1	760
	21st to end	Night	30% 18% 27% 22% 3	836

Page generated at 2024-11-29 10:43:11. Version ac07

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