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 2024-11-30.

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	14% 10% 4 10% 6% 5% 5% 4 6% 7% 30%	101365
	Night	13% 12% 5% 10% 6% 5% 4 3 5% 6% 31%	98169
Transparency	Day	50% 8% 11% 20% 10% 1	105011
	Night	51% 7% 11% 19% 10% 2	102662
Seeing	Day	23% 18% 26% 19% 10% 4	14858
	Night	21% 18% 26% 24% 10% 1	24521

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	15% 16% 8% 18% 6% 4 4 3 4 4 18%	2754
	11th to 20th	Day	8% 18% 9% 22% 9% 7% 3 2 3 3 15%	2840
	21st to end	Day	18% 15% 10% 16% 8% 5% 4 2 3 4 14%	3124
February	1st to 10th	Day	12% 16% 6% 13% 9% 5% 5% 3 5% 6% 21%	1710
	11th to 20th	Day	14% 12% 6% 16% 7% 6% 5% 4 5% 5% 21%	1663
	21st to end	Day	15% 16% 5% 12% 7% 5% 4 4 3 4 23%	1578
March	1st to 10th	Day	16% 11% 5% 10% 6% 5% 4 4 5% 6% 27%	3435
	11th to 20th	Day	11% 10% 6% 13% 7% 5% 4 4 6% 6% 29%	3480
	21st to end	Day	16% 11% 4 9% 6% 5% 4 4 4 6% 32%	3815
April	1st to 10th	Day	13% 12% 5% 9% 5% 6% 5% 4 6% 7% 27%	2226
	11th to 20th	Day	13% 12% 4 8% 6% 5% 4 4 4 7% 33%	2254
	21st to end	Day	20% 11% 3 7% 5% 5% 4 4 5% 7% 30%	2427
May	1st to 10th	Day	22% 11% 4 8% 5% 5% 5% 4 5% 5% 26%	4082
	11th to 20th	Day	21% 9% 2 7% 5% 5% 5% 5% 6% 7% 28%	4081
	21st to end	Day	12% 8% 3 7% 5% 5% 5% 5% 7% 10% 34%	4818
June	1st to 10th	Day	14% 7% 3 7% 6% 5% 6% 4 6% 9% 32%	2660
	11th to 20th	Day	14% 7% 3 6% 6% 5% 6% 5% 7% 9% 32%	2660
	21st to end	Day	13% 7% 2 8% 4 5% 5% 5% 7% 11% 33%	2660
July	1st to 10th	Day	8% 6% 2 7% 5% 6% 6% 4 7% 8% 40%	4389
	11th to 20th	Day	9% 7% 2 7% 5% 5% 5% 5% 7% 9% 37%	4120
	21st to end	Day	12% 9% 3 9% 5% 6% 5% 4 6% 8% 33%	4466
August	1st to 10th	Day	13% 9% 3 8% 6% 5% 6% 5% 7% 9% 29%	4104
	11th to 20th	Day	10% 7% 3 9% 5% 6% 6% 5% 7% 8% 33%	4044
	21st to end	Day	8% 5% 2 6% 5% 5% 6% 5% 7% 10% 41%	4226
September	1st to 10th	Day	15% 5% 2 6% 4 5% 5% 3 6% 8% 40%	2280
	11th to 20th	Day	12% 7% 3 6% 4 4 4 4 6% 7% 43%	2157
	21st to end	Day	17% 11% 4 8% 4 4 4 3 5% 7% 32%	2052
October	1st to 10th	Day	14% 8% 2 7% 4 4 5% 5% 6% 6% 38%	1900
	11th to 20th	Day	16% 11% 3 7% 5% 4 4 4 5% 6% 35%	1900
	21st to end	Day	17% 13% 3 8% 4 4 3 2 4 6% 35%	2090
November	1st to 10th	Day	10% 12% 3 8% 4 4 5% 3 5% 6% 41%	1952
	11th to 20th	Day	12% 13% 7% 9% 6% 4 4 4 5% 7% 29%	1618
	21st to end	Day	13% 17% 7% 12% 6% 5% 5% 3 5% 5% 23%	1598
December	1st to 10th	Day	15% 17% 8% 16% 9% 5% 5% 3 4 3 17%	1520
	11th to 20th	Day	14% 16% 6% 17% 5% 4 4 3 4 5% 21%	1910
	21st to end	Day	17% 20% 7% 13% 7% 4 4 3 5% 5% 16%	2772
January	1st to 10th	Night	9% 17% 9% 20% 7% 5% 4 3 4 4 17%	4173
	11th to 20th	Night	11% 16% 9% 19% 8% 7% 5% 3 3 3 16%	4120
	21st to end	Night	20% 17% 7% 14% 10% 4 3 2 3 3 17%	4532
February	1st to 10th	Night	12% 14% 6% 13% 7% 5% 5% 3 4 5% 26%	2470
	11th to 20th	Night	13% 14% 6% 13% 8% 6% 6% 4 4 5% 21%	2403
	21st to end	Night	14% 14% 6% 13% 7% 5% 4 3 4 4 25%	1872
March	1st to 10th	Night	18% 14% 4 8% 5% 5% 4 3 5% 6% 28%	3418
	11th to 20th	Night	12% 10% 6% 13% 6% 5% 4 4 5% 6% 30%	3480
	21st to end	Night	13% 12% 4 9% 5% 4 4 3 4 6% 36%	3817
April	1st to 10th	Night	13% 16% 4 9% 5% 4 4 4 4 5% 31%	1953
	11th to 20th	Night	13% 11% 4 8% 5% 5% 4 3 6% 7% 35%	1875
	21st to end	Night	14% 10% 4 7% 5% 4 4 4 5% 8% 36%	1768
May	1st to 10th	Night	24% 13% 4 7% 4 4 4 4 4 6% 26%	2813
	11th to 20th	Night	18% 13% 3 8% 5% 4 4 4 5% 5% 31%	2812
	21st to end	Night	12% 9% 4 8% 5% 4 5% 4 6% 7% 36%	2736
June	1st to 10th	Night	10% 7% 3 7% 5% 4 5% 4 6% 8% 42%	1520
	11th to 20th	Night	11% 7% 2 8% 5% 4 4 4 7% 10% 38%	1520
	21st to end	Night	11% 7% 2 5% 5% 4 5% 4 7% 10% 40%	1520
July	1st to 10th	Night	8% 8% 3 9% 6% 4 5% 4 7% 9% 36%	2566
	11th to 20th	Night	8% 7% 2 7% 5% 5% 5% 4 7% 9% 41%	2840
	21st to end	Night	10% 8% 4 8% 5% 5% 5% 4 6% 7% 39%	3087
August	1st to 10th	Night	13% 10% 3 6% 5% 4 5% 5% 7% 10% 32%	2825
	11th to 20th	Night	11% 10% 3 7% 5% 4 5% 3 5% 6% 40%	2785
	21st to end	Night	7% 6% 2 6% 5% 5% 5% 3 7% 9% 45%	3398
September	1st to 10th	Night	12% 7% 2 7% 4 4 5% 4 5% 7% 45%	1900
	11th to 20th	Night	11% 6% 2 4 3 3 4 4 5% 8% 50%	2019
	21st to end	Night	17% 9% 3 7% 4 4 4 4 5% 6% 39%	2128
October	1st to 10th	Night	14% 8% 2 6% 3 4 4 4 6% 6% 42%	2280
	11th to 20th	Night	13% 10% 2 7% 4 5% 5% 4 6% 7% 38%	2280
	21st to end	Night	19% 12% 3 7% 3 4 4 3 5% 6% 35%	2508
November	1st to 10th	Night	9% 11% 4 8% 4 3 4 3 4 5% 43%	2344
	11th to 20th	Night	14% 12% 6% 10% 6% 5% 4 3 5% 5% 29%	2780
	21st to end	Night	14% 14% 6% 11% 6% 5% 4 4 4 5% 27%	2798
December	1st to 10th	Night	17% 17% 8% 15% 7% 4 4 3 4 4 18%	2660
	11th to 20th	Night	15% 13% 6% 17% 7% 5% 4 3 4 4 21%	3285
	21st to end	Night	16% 18% 10% 13% 6% 5% 5% 3 4 5% 14%	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	69% 6% 9% 11% 4 1	2755
	11th to 20th	Day	75% 4 7% 9% 5%	2840
	21st to end	Day	73% 7% 7% 9% 4	3124
February	1st to 10th	Day	65% 6% 10% 11% 7%	1710
	11th to 20th	Day	64% 7% 10% 12% 8%	1672
	21st to end	Day	63% 5% 10% 12% 7% 2	1578
March	1st to 10th	Day	54% 7% 12% 21% 6% 1	3435
	11th to 20th	Day	49% 10% 12% 21% 7% 1	3480
	21st to end	Day	50% 8% 12% 17% 11% 1	3815
April	1st to 10th	Day	54% 7% 11% 15% 10% 2	2226
	11th to 20th	Day	49% 9% 11% 15% 14% 2	2254
	21st to end	Day	53% 7% 10% 20% 9% 1	2427
May	1st to 10th	Day	56% 9% 8% 19% 7% 1	4120
	11th to 20th	Day	51% 10% 13% 19% 6% 1	4085
	21st to end	Day	39% 12% 16% 20% 10% 2	4832
June	1st to 10th	Day	45% 9% 13% 22% 9% 1	2660
	11th to 20th	Day	45% 11% 14% 20% 11% 1	2660
	21st to end	Day	43% 9% 14% 24% 10% 1	2660
July	1st to 10th	Day	40% 8% 14% 23% 12% 2	4320
	11th to 20th	Day	39% 8% 15% 26% 12%	4051
	21st to end	Day	47% 6% 10% 21% 15% 1	4324
August	1st to 10th	Day	49% 9% 15% 19% 7%	4091
	11th to 20th	Day	44% 8% 12% 27% 9%	4083
	21st to end	Day	36% 9% 15% 27% 12% 1	4226
September	1st to 10th	Day	41% 8% 12% 19% 16% 4	2280
	11th to 20th	Day	38% 7% 11% 27% 15% 2	2157
	21st to end	Day	50% 7% 12% 19% 12% 1	2052
October	1st to 10th	Day	35% 6% 9% 28% 18% 4	3160
	11th to 20th	Day	42% 6% 12% 20% 11% 9%	3140
	21st to end	Day	36% 4 10% 28% 21% 1	3428
November	1st to 10th	Day	44% 7% 10% 19% 16% 5%	1952
	11th to 20th	Day	54% 7% 9% 16% 11% 3	1618
	21st to end	Day	61% 6% 10% 14% 8%	1598
December	1st to 10th	Day	71% 6% 7% 10% 4 1	1520
	11th to 20th	Day	66% 4 8% 17% 4 1	1906
	21st to end	Day	68% 7% 10% 11% 3	2772
January	1st to 10th	Night	69% 6% 7% 11% 6% 1	4173
	11th to 20th	Night	71% 7% 10% 10% 2	4120
	21st to end	Night	73% 5% 5% 12% 4 1	4532
February	1st to 10th	Night	61% 6% 10% 16% 8%	2470
	11th to 20th	Night	65% 5% 9% 13% 7%	2405
	21st to end	Night	61% 6% 10% 13% 8% 2	1872
March	1st to 10th	Night	54% 8% 10% 21% 6% 1	3418
	11th to 20th	Night	50% 10% 14% 21% 5% 1	3480
	21st to end	Night	46% 8% 11% 22% 12% 2	3817
April	1st to 10th	Night	52% 7% 11% 15% 12% 2	1953
	11th to 20th	Night	46% 8% 13% 16% 14% 3	1875
	21st to end	Night	46% 8% 12% 24% 7% 3	1768
May	1st to 10th	Night	58% 6% 10% 16% 8% 2	2840
	11th to 20th	Night	51% 12% 11% 18% 8% 1	2813
	21st to end	Night	41% 11% 15% 21% 8% 4	2743
June	1st to 10th	Night	38% 11% 12% 25% 14% 1	1520
	11th to 20th	Night	40% 10% 14% 25% 10% 2	1520
	21st to end	Night	37% 9% 17% 23% 13% 1	1520
July	1st to 10th	Night	43% 8% 13% 21% 12% 2	2525
	11th to 20th	Night	37% 9% 16% 24% 13% 1	2786
	21st to end	Night	43% 8% 11% 21% 16% 1	2988
August	1st to 10th	Night	45% 10% 18% 20% 8%	2814
	11th to 20th	Night	43% 7% 10% 27% 13%	2812
	21st to end	Night	33% 8% 13% 31% 12% 2	3398
September	1st to 10th	Night	38% 8% 12% 22% 16% 4	1900
	11th to 20th	Night	31% 7% 14% 27% 20% 1	2019
	21st to end	Night	45% 7% 11% 21% 15% 1	2128
October	1st to 10th	Night	35% 5% 10% 27% 21% 2	3800
	11th to 20th	Night	34% 6% 12% 23% 15% 9%	3779
	21st to end	Night	36% 5% 10% 28% 20% 2	4120
November	1st to 10th	Night	43% 5% 11% 19% 18% 5%	2344
	11th to 20th	Night	55% 5% 9% 16% 11% 3	2780
	21st to end	Night	59% 5% 11% 16% 8% 1	2798
December	1st to 10th	Night	70% 5% 9% 11% 4 1	2660
	11th to 20th	Night	65% 5% 9% 15% 5% 1	3288
	21st to end	Night	69% 8% 10% 9% 4	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	30% 33% 22% 10% 4 1	249
	11th to 20th	Day	38% 32% 24% 4 2	270
	21st to end	Day	32% 32% 29% 5% 3	297
February	1st to 10th	Day	31% 31% 29% 7% 1	270
	11th to 20th	Day	40% 30% 24% 5%	270
	21st to end	Day	41% 26% 23% 9% 1	305
March	1st to 10th	Day	31% 28% 27% 12% 3	460
	11th to 20th	Day	33% 26% 25% 12% 3 1	460
	21st to end	Day	31% 23% 30% 13% 3 1	506
April	1st to 10th	Day	30% 24% 26% 14% 5% 1	460
	11th to 20th	Day	25% 24% 28% 14% 7% 3	452
	21st to end	Day	30% 19% 29% 16% 4 2	460
May	1st to 10th	Day	27% 22% 25% 16% 6% 3	463
	11th to 20th	Day	25% 16% 29% 18% 8% 3	487
	21st to end	Day	15% 12% 27% 28% 12% 7%	529
June	1st to 10th	Day	17% 12% 31% 23% 12% 4	490
	11th to 20th	Day	21% 12% 26% 20% 17% 5%	490
	21st to end	Day	15% 15% 30% 24% 14% 2	490
July	1st to 10th	Day	13% 8% 27% 24% 16% 12%	485
	11th to 20th	Day	11% 8% 27% 33% 14% 7%	484
	21st to end	Day	16% 8% 27% 26% 18% 5%	532
August	1st to 10th	Day	13% 9% 24% 29% 17% 7%	486
	11th to 20th	Day	17% 7% 24% 27% 15% 10%	479
	21st to end	Day	13% 7% 26% 27% 18% 9%	539
September	1st to 10th	Day	18% 10% 20% 25% 18% 9%	490
	11th to 20th	Day	13% 6% 22% 31% 20% 9%	490
	21st to end	Day	27% 12% 24% 19% 12% 5%	490
October	1st to 10th	Day	18% 14% 25% 23% 16% 3	490
	11th to 20th	Day	24% 18% 28% 20% 10% 1	490
	21st to end	Day	26% 24% 27% 17% 6% 1	539
November	1st to 10th	Day	19% 22% 28% 20% 9% 2	490
	11th to 20th	Day	27% 26% 32% 9% 5% 1	208
	21st to end	Day	30% 28% 32% 9% 2	200
December	1st to 10th	Day	29% 36% 22% 8% 3 1	180
	11th to 20th	Day	32% 29% 26% 12% 1	180
	21st to end	Day	33% 32% 22% 10% 3	198
January	1st to 10th	Night	25% 35% 26% 12% 2	760
	11th to 20th	Night	29% 29% 27% 14% 1	760
	21st to end	Night	24% 33% 29% 14% 1	836
February	1st to 10th	Night	27% 27% 28% 17% 1	760
	11th to 20th	Night	28% 36% 26% 10%	743
	21st to end	Night	29% 25% 32% 12% 1	628
March	1st to 10th	Night	23% 25% 32% 18% 2	760
	11th to 20th	Night	27% 26% 24% 16% 6% 1	760
	21st to end	Night	24% 23% 32% 16% 4 1	836
April	1st to 10th	Night	24% 23% 30% 19% 4	760
	11th to 20th	Night	21% 18% 29% 23% 8% 1	751
	21st to end	Night	21% 14% 32% 26% 6% 1	628
May	1st to 10th	Night	24% 13% 25% 30% 8% 1	570
	11th to 20th	Night	22% 11% 27% 29% 10% 1	561
	21st to end	Night	10% 6% 27% 30% 25% 2	416
June	1st to 10th	Night	13% 6% 24% 38% 17% 1	380
	11th to 20th	Night	12% 9% 25% 34% 18% 1	380
	21st to end	Night	12% 7% 29% 36% 16% 1	380
July	1st to 10th	Night	11% 3 21% 38% 24% 3	389
	11th to 20th	Night	10% 5% 19% 36% 26% 4	552
	21st to end	Night	12% 5% 20% 39% 24% 1	624
August	1st to 10th	Night	10% 4 16% 42% 26% 2	567
	11th to 20th	Night	12% 6% 15% 37% 26% 4	564
	21st to end	Night	14% 4 17% 37% 24% 4	784
September	1st to 10th	Night	15% 7% 19% 32% 23% 4	760
	11th to 20th	Night	12% 4 19% 35% 25% 4	760
	21st to end	Night	22% 11% 20% 28% 18% 3	760
October	1st to 10th	Night	19% 9% 22% 29% 17% 3	760
	11th to 20th	Night	19% 16% 27% 27% 10% 1	760
	21st to end	Night	26% 18% 26% 23% 6% 1	836
November	1st to 10th	Night	16% 17% 30% 27% 9% 1	780
	11th to 20th	Night	25% 22% 26% 20% 7% 1	800
	21st to end	Night	25% 24% 31% 15% 4	800
December	1st to 10th	Night	29% 28% 24% 14% 4	760
	11th to 20th	Night	27% 28% 27% 16% 2	760
	21st to end	Night	27% 27% 30% 15% 1	836

Page generated at 2024-11-27 17:30:54. Version ac07

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