Pioneer Park Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pioneer Park Campground clear sky chart from 2005-11-06 to 2026-02-16.

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	13% 10% 4 10% 6% 5% 5% 4 6% 7% 29%	130864
	Night	12% 11% 5% 11% 7% 5% 5% 4 5% 6% 30%	129956
Transparency	Day	51% 7% 11% 19% 10% 1	134466
	Night	52% 7% 11% 19% 10% 2	134424
Seeing	Day	24% 18% 26% 19% 9% 4	16358
	Night	21% 18% 25% 24% 10% 1	26118

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	13% 12% 9% 21% 11% 5% 4 3 4 4 14%	5122
	11th to 20th	Day	7% 14% 7% 23% 13% 9% 5% 2 3 3 14%	5280
	21st to end	Day	14% 10% 8% 12% 11% 7% 6% 3 4 5% 21%	5780
February	1st to 10th	Day	11% 16% 6% 14% 8% 5% 5% 3 5% 6% 21%	1890
	11th to 20th	Day	14% 12% 7% 16% 7% 5% 5% 3 5% 5% 21%	1798
	21st to end	Day	15% 16% 5% 12% 7% 5% 4 4 4 5% 23%	1659
March	1st to 10th	Day	13% 10% 8% 10% 6% 5% 4 3 5% 6% 31%	4935
	11th to 20th	Day	11% 9% 6% 10% 5% 5% 4 4 6% 7% 34%	4980
	21st to end	Day	13% 10% 4 10% 7% 6% 5% 4 5% 6% 32%	5465
April	1st to 10th	Day	15% 12% 5% 9% 6% 6% 5% 4 6% 7% 26%	2343
	11th to 20th	Day	13% 12% 4 8% 6% 5% 4 4 4 7% 33%	2374
	21st to end	Day	19% 10% 3 7% 5% 5% 4 4 5% 7% 31%	2555
May	1st to 10th	Day	18% 10% 3 9% 6% 6% 6% 5% 6% 7% 25%	5862
	11th to 20th	Day	19% 9% 3 7% 5% 5% 5% 5% 7% 9% 26%	5861
	21st to end	Day	16% 10% 3 8% 5% 5% 5% 5% 7% 8% 28%	6929
June	1st to 10th	Day	14% 7% 3 7% 6% 5% 6% 5% 7% 9% 33%	2800
	11th to 20th	Day	14% 8% 3 6% 6% 5% 6% 5% 7% 9% 32%	2800
	21st to end	Day	12% 7% 2 8% 5% 5% 5% 5% 7% 10% 35%	2800
July	1st to 10th	Day	8% 6% 3 7% 6% 6% 6% 4 6% 8% 41%	6281
	11th to 20th	Day	9% 7% 3 9% 6% 6% 7% 5% 8% 10% 30%	5900
	21st to end	Day	10% 8% 3 8% 5% 5% 5% 4 6% 9% 36%	6424
August	1st to 10th	Day	13% 9% 3 8% 6% 5% 6% 5% 7% 9% 29%	4234
	11th to 20th	Day	10% 7% 3 8% 5% 6% 6% 5% 7% 8% 33%	4174
	21st to end	Day	7% 5% 2 6% 5% 5% 6% 5% 7% 10% 41%	4359
September	1st to 10th	Day	15% 5% 2 6% 4 5% 5% 3 6% 7% 41%	2400
	11th to 20th	Day	11% 7% 3 6% 4 4 4 4 6% 8% 44%	2270
	21st to end	Day	18% 11% 4 8% 4 4 4 3 5% 7% 31%	2160
October	1st to 10th	Day	14% 8% 2 6% 4 4 5% 4 6% 7% 40%	2000
	11th to 20th	Day	16% 11% 3 7% 5% 4 4 4 5% 6% 35%	2000
	21st to end	Day	17% 13% 3 9% 4 4 3 3 4 6% 34%	2200
November	1st to 10th	Day	10% 12% 3 8% 4 4 5% 3 5% 6% 41%	2052
	11th to 20th	Day	12% 14% 7% 9% 6% 4 4 4 5% 7% 28%	1699
	21st to end	Day	14% 16% 7% 13% 6% 4 5% 3 5% 5% 23%	1680
December	1st to 10th	Day	12% 12% 5% 21% 9% 6% 5% 4 4 4 17%	2680
	11th to 20th	Day	17% 16% 6% 15% 5% 4 4 2 3 5% 22%	3070
	21st to end	Day	15% 19% 7% 14% 8% 5% 5% 3 5% 5% 16%	4048
January	1st to 10th	Night	8% 14% 7% 21% 14% 6% 5% 3 4 4 14%	7753
	11th to 20th	Night	7% 14% 7% 19% 11% 9% 6% 4 4 4 17%	7680
	21st to end	Night	12% 13% 6% 11% 10% 8% 5% 3 5% 5% 23%	8401
February	1st to 10th	Night	12% 14% 6% 13% 7% 6% 5% 3 4 5% 26%	2730
	11th to 20th	Night	13% 14% 6% 14% 8% 6% 6% 4 5% 5% 21%	2599
	21st to end	Night	14% 13% 6% 13% 8% 5% 4 3 4 5% 25%	1967
March	1st to 10th	Night	14% 12% 5% 10% 6% 5% 4 3 4 5% 30%	4918
	11th to 20th	Night	9% 8% 5% 10% 5% 4 4 4 5% 7% 39%	4980
	21st to end	Night	11% 11% 4 9% 6% 4 5% 4 5% 6% 35%	5467
April	1st to 10th	Night	13% 16% 4 9% 5% 4 4 4 4 5% 31%	2056
	11th to 20th	Night	13% 11% 4 8% 5% 5% 4 3 6% 7% 35%	1975
	21st to end	Night	14% 10% 4 7% 5% 4 4 4 5% 8% 35%	1861
May	1st to 10th	Night	22% 14% 4 8% 5% 5% 4 4 5% 6% 24%	4033
	11th to 20th	Night	17% 12% 3 8% 4 4 4 4 6% 7% 30%	4032
	21st to end	Night	17% 11% 4 8% 5% 4 5% 4 5% 7% 29%	3924
June	1st to 10th	Night	11% 7% 3 7% 5% 3 5% 4 6% 8% 42%	1600
	11th to 20th	Night	11% 8% 3 8% 5% 4 4 4 7% 10% 37%	1600
	21st to end	Night	11% 6% 2 5% 5% 4 5% 4 7% 10% 40%	1600
July	1st to 10th	Night	8% 9% 3 9% 6% 5% 5% 4 6% 8% 37%	3658
	11th to 20th	Night	10% 8% 2 8% 5% 5% 6% 5% 7% 9% 34%	4057
	21st to end	Night	9% 7% 4 8% 5% 5% 5% 4 6% 9% 40%	4427
August	1st to 10th	Night	12% 10% 3 6% 5% 4 5% 5% 7% 10% 33%	2915
	11th to 20th	Night	10% 10% 3 7% 5% 4 5% 3 5% 7% 41%	2875
	21st to end	Night	7% 6% 2 6% 5% 5% 5% 4 7% 9% 45%	3505
September	1st to 10th	Night	12% 7% 2 7% 4 4 5% 4 4 7% 46%	2000
	11th to 20th	Night	10% 6% 2 4 3 3 5% 4 5% 8% 50%	2125
	21st to end	Night	17% 9% 3 7% 4 4 4 4 5% 6% 37%	2240
October	1st to 10th	Night	14% 8% 2 6% 3 4 4 4 6% 6% 44%	2400
	11th to 20th	Night	13% 10% 2 7% 4 5% 5% 4 6% 7% 38%	2400
	21st to end	Night	18% 12% 3 7% 3 4 4 3 5% 6% 35%	2640
November	1st to 10th	Night	9% 11% 4 8% 4 3 4 3 4 5% 43%	2464
	11th to 20th	Night	14% 12% 5% 10% 6% 5% 4 3 5% 5% 29%	2919
	21st to end	Night	14% 14% 6% 11% 6% 5% 4 3 4 5% 27%	2940
December	1st to 10th	Night	13% 12% 6% 20% 7% 5% 5% 3 5% 4 21%	4720
	11th to 20th	Night	17% 13% 7% 16% 7% 5% 3 3 4 5% 22%	5345
	21st to end	Night	13% 17% 9% 15% 8% 5% 6% 3 4 5% 16%	7150

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	72% 5% 9% 10% 3 1	5123
	11th to 20th	Day	76% 4 6% 8% 5% 2	5280
	21st to end	Day	65% 5% 9% 13% 7% 1	5780
February	1st to 10th	Day	64% 5% 10% 12% 8%	1890
	11th to 20th	Day	64% 6% 10% 13% 7%	1807
	21st to end	Day	62% 6% 11% 12% 7% 2	1659
March	1st to 10th	Day	52% 6% 10% 22% 8% 2	4935
	11th to 20th	Day	45% 8% 13% 24% 8% 2	4980
	21st to end	Day	50% 7% 10% 18% 13% 2	5465
April	1st to 10th	Day	55% 7% 11% 15% 10% 2	2343
	11th to 20th	Day	48% 9% 11% 16% 14% 2	2374
	21st to end	Day	52% 7% 10% 21% 9% 1	2555
May	1st to 10th	Day	55% 9% 10% 18% 7% 2	5897
	11th to 20th	Day	51% 9% 11% 21% 6% 1	5865
	21st to end	Day	48% 10% 14% 18% 9% 1	6944
June	1st to 10th	Day	45% 9% 13% 22% 10% 1	2800
	11th to 20th	Day	46% 10% 14% 19% 10% 1	2800
	21st to end	Day	42% 9% 14% 24% 11% 1	2800
July	1st to 10th	Day	40% 7% 11% 26% 14% 2	6212
	11th to 20th	Day	45% 9% 15% 21% 9%	5831
	21st to end	Day	42% 6% 10% 24% 17% 1	6240
August	1st to 10th	Day	49% 9% 15% 20% 8%	4221
	11th to 20th	Day	44% 8% 12% 28% 9%	4213
	21st to end	Day	35% 9% 15% 28% 12% 1	4359
September	1st to 10th	Day	40% 8% 11% 20% 17% 4	2400
	11th to 20th	Day	38% 7% 12% 27% 15% 2	2270
	21st to end	Day	50% 7% 12% 18% 12% 1	2160
October	1st to 10th	Day	34% 6% 9% 27% 19% 4	3260
	11th to 20th	Day	42% 6% 12% 20% 11% 9%	3240
	21st to end	Day	36% 4 10% 28% 21% 1	3538
November	1st to 10th	Day	43% 7% 11% 19% 16% 4	2052
	11th to 20th	Day	55% 6% 9% 16% 11% 3	1699
	21st to end	Day	62% 6% 10% 14% 8%	1680
December	1st to 10th	Day	67% 6% 14% 10% 3	2680
	11th to 20th	Day	66% 4 10% 15% 5%	3066
	21st to end	Day	68% 6% 9% 12% 4	4048
January	1st to 10th	Night	73% 5% 7% 10% 4	7754
	11th to 20th	Night	67% 6% 10% 11% 5% 1	7680
	21st to end	Night	63% 5% 9% 16% 6% 1	8401
February	1st to 10th	Night	60% 6% 10% 16% 8%	2730
	11th to 20th	Night	65% 5% 9% 13% 7%	2601
	21st to end	Night	61% 6% 9% 14% 8% 2	1967
March	1st to 10th	Night	53% 7% 9% 21% 8% 1	4918
	11th to 20th	Night	41% 8% 16% 25% 7% 4	4980
	21st to end	Night	46% 7% 13% 19% 13% 2	5467
April	1st to 10th	Night	53% 7% 11% 15% 12% 2	2056
	11th to 20th	Night	46% 8% 13% 16% 14% 3	1975
	21st to end	Night	46% 8% 12% 25% 8% 3	1861
May	1st to 10th	Night	59% 7% 11% 13% 8% 2	4060
	11th to 20th	Night	49% 10% 10% 24% 7% 1	4033
	21st to end	Night	50% 9% 12% 19% 6% 3	3931
June	1st to 10th	Night	38% 10% 11% 25% 14% 1	1600
	11th to 20th	Night	41% 10% 14% 24% 10% 2	1600
	21st to end	Night	37% 9% 17% 23% 14% 1	1600
July	1st to 10th	Night	44% 7% 12% 23% 12% 2	3619
	11th to 20th	Night	44% 8% 18% 20% 10%	4006
	21st to end	Night	40% 7% 11% 23% 18% 1	4297
August	1st to 10th	Night	44% 9% 18% 20% 8%	2904
	11th to 20th	Night	42% 7% 10% 27% 13%	2902
	21st to end	Night	34% 8% 13% 31% 12% 2	3505
September	1st to 10th	Night	37% 7% 12% 23% 17% 3	2000
	11th to 20th	Night	31% 7% 14% 27% 20% 1	2125
	21st to end	Night	47% 7% 11% 20% 15% 1	2240
October	1st to 10th	Night	35% 5% 10% 27% 22% 2	3920
	11th to 20th	Night	34% 6% 11% 24% 16% 9%	3899
	21st to end	Night	36% 5% 10% 28% 20% 2	4252
November	1st to 10th	Night	43% 5% 11% 19% 18% 4	2464
	11th to 20th	Night	55% 5% 9% 16% 11% 3	2919
	21st to end	Night	59% 5% 11% 16% 7% 1	2940
December	1st to 10th	Night	63% 6% 12% 15% 3 1	4720
	11th to 20th	Night	65% 4 11% 15% 4	5348
	21st to end	Night	69% 7% 9% 10% 5%	7150

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	33% 31% 23% 9% 4 1	305
	11th to 20th	Day	41% 32% 22% 3 2	330
	21st to end	Day	34% 33% 27% 5% 2	363
February	1st to 10th	Day	32% 32% 28% 7% 2	330
	11th to 20th	Day	43% 29% 24% 4	315
	21st to end	Day	40% 27% 25% 8% 1	333
March	1st to 10th	Day	32% 27% 26% 12% 3	500
	11th to 20th	Day	33% 26% 25% 12% 3 1	500
	21st to end	Day	31% 24% 29% 13% 3 1	550
April	1st to 10th	Day	32% 24% 25% 13% 5% 1	500
	11th to 20th	Day	26% 24% 27% 14% 7% 2	492
	21st to end	Day	29% 20% 29% 16% 4 2	500
May	1st to 10th	Day	27% 22% 26% 16% 6% 3	503
	11th to 20th	Day	25% 17% 28% 18% 8% 3	527
	21st to end	Day	18% 12% 27% 26% 11% 6%	573
June	1st to 10th	Day	16% 14% 31% 23% 12% 4	530
	11th to 20th	Day	22% 13% 26% 19% 15% 5%	530
	21st to end	Day	15% 14% 29% 25% 15% 3	530
July	1st to 10th	Day	13% 8% 28% 24% 16% 12%	525
	11th to 20th	Day	11% 9% 26% 33% 14% 7%	524
	21st to end	Day	15% 8% 27% 26% 18% 6%	576
August	1st to 10th	Day	13% 9% 25% 29% 16% 7%	526
	11th to 20th	Day	17% 7% 23% 28% 15% 10%	519
	21st to end	Day	12% 8% 26% 27% 18% 9%	583
September	1st to 10th	Day	18% 10% 19% 25% 18% 10%	530
	11th to 20th	Day	12% 5% 22% 31% 20% 9%	530
	21st to end	Day	28% 12% 25% 19% 12% 5%	530
October	1st to 10th	Day	18% 13% 24% 24% 17% 4	530
	11th to 20th	Day	24% 18% 28% 19% 9% 1	530
	21st to end	Day	26% 25% 27% 16% 6% 1	583
November	1st to 10th	Day	20% 23% 28% 19% 8% 2	530
	11th to 20th	Day	30% 25% 31% 9% 4 1	229
	21st to end	Day	32% 27% 31% 9% 1	220
December	1st to 10th	Day	30% 38% 22% 6% 3 1	220
	11th to 20th	Day	33% 29% 27% 10% 1	220
	21st to end	Day	35% 31% 21% 10% 2	242
January	1st to 10th	Night	26% 34% 26% 11% 2	840
	11th to 20th	Night	31% 30% 26% 13%	840
	21st to end	Night	26% 33% 28% 12% 1	924
February	1st to 10th	Night	27% 27% 28% 17% 1	840
	11th to 20th	Night	30% 34% 26% 10%	804
	21st to end	Night	28% 25% 32% 12% 1	660
March	1st to 10th	Night	24% 25% 32% 17% 2	800
	11th to 20th	Night	26% 26% 24% 17% 6% 1	800
	21st to end	Night	24% 24% 32% 15% 4 1	880
April	1st to 10th	Night	25% 23% 30% 19% 4	800
	11th to 20th	Night	22% 18% 29% 23% 8% 1	791
	21st to end	Night	21% 15% 32% 26% 6% 1	661
May	1st to 10th	Night	24% 13% 25% 29% 8% 1	600
	11th to 20th	Night	22% 12% 27% 29% 10% 1	591
	21st to end	Night	11% 8% 27% 29% 24% 2	438
June	1st to 10th	Night	13% 7% 24% 39% 17% 1	400
	11th to 20th	Night	13% 10% 26% 33% 18% 1	400
	21st to end	Night	12% 6% 28% 35% 17% 2	400
July	1st to 10th	Night	11% 3 21% 38% 24% 3	410
	11th to 20th	Night	9% 5% 19% 36% 27% 4	582
	21st to end	Night	12% 5% 19% 39% 25% 2	657
August	1st to 10th	Night	10% 4 16% 42% 26% 2	597
	11th to 20th	Night	11% 6% 15% 38% 27% 4	594
	21st to end	Night	13% 5% 18% 37% 24% 4	825
September	1st to 10th	Night	15% 7% 19% 33% 23% 4	800
	11th to 20th	Night	12% 4 18% 36% 26% 4	800
	21st to end	Night	21% 11% 20% 28% 18% 2	800
October	1st to 10th	Night	19% 9% 21% 30% 18% 3	800
	11th to 20th	Night	19% 16% 28% 27% 9% 1	800
	21st to end	Night	26% 18% 27% 23% 6% 1	880
November	1st to 10th	Night	17% 17% 30% 27% 8% 1	820
	11th to 20th	Night	27% 21% 26% 19% 7% 1	840
	21st to end	Night	25% 25% 31% 14% 4	840
December	1st to 10th	Night	28% 30% 25% 14% 4	840
	11th to 20th	Night	28% 28% 26% 16% 2	840
	21st to end	Night	27% 26% 30% 15% 1	924

Page generated at 2026-02-13 01:42:13. Version ac07

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