Wawayanda State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wawayanda State Park 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	17% 8% 3 6% 4 4 4 4 5% 7% 38%	101356
	Night	17% 8% 3 6% 4 4 4 3 5% 7% 40%	97657
Transparency	Day	24% 47% 6% 13% 8% 1	104875
	Night	23% 47% 6% 13% 8% 1	102214
Seeing	Day	23% 17% 30% 20% 9% 2	14936
	Night	20% 15% 32% 24% 8% 1	24077

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	14% 9% 3 5% 3 5% 4 3 4 5% 45%	2517
	11th to 20th	Day	15% 10% 3 8% 6% 5% 5% 4 5% 5% 34%	2520
	21st to end	Day	21% 13% 5% 6% 4 3 3 3 4 5% 31%	3028
February	1st to 10th	Day	17% 9% 2 7% 5% 4 4 4 6% 6% 35%	1710
	11th to 20th	Day	14% 9% 3 6% 5% 4 4 3 4 7% 39%	1824
	21st to end	Day	18% 11% 2 6% 4 4 5% 3 4 6% 37%	1570
March	1st to 10th	Day	26% 10% 2 6% 4 3 4 2 3 5% 34%	3116
	11th to 20th	Day	10% 7% 3 7% 5% 5% 5% 4 6% 8% 41%	3375
	21st to end	Day	20% 8% 2 5% 4 3 3 3 4 6% 41%	4116
April	1st to 10th	Day	17% 10% 3 6% 5% 3 4 4 4 7% 37%	2280
	11th to 20th	Day	17% 7% 3 6% 5% 3 4 3 5% 6% 40%	2254
	21st to end	Day	18% 7% 2 7% 5% 4 4 4 5% 6% 37%	2289
May	1st to 10th	Day	28% 8% 2 6% 4 3 4 3 5% 7% 30%	4156
	11th to 20th	Day	22% 9% 3 8% 5% 5% 4 4 5% 7% 29%	4398
	21st to end	Day	13% 5% 2 5% 4 4 4 4 6% 9% 43%	4837
June	1st to 10th	Day	16% 6% 2 5% 6% 5% 5% 4 6% 8% 36%	2660
	11th to 20th	Day	16% 6% 2 7% 4 5% 6% 4 7% 10% 34%	2660
	21st to end	Day	13% 6% 2 8% 6% 4 5% 4 6% 8% 38%	2660
July	1st to 10th	Day	10% 6% 3 8% 6% 7% 6% 5% 6% 10% 34%	4440
	11th to 20th	Day	10% 6% 2 6% 5% 5% 6% 5% 7% 10% 37%	4440
	21st to end	Day	15% 8% 3 8% 6% 6% 5% 4 6% 7% 33%	4814
August	1st to 10th	Day	22% 5% 2 7% 5% 5% 5% 5% 6% 7% 30%	4194
	11th to 20th	Day	12% 7% 3 7% 4 5% 4 4 6% 8% 41%	3730
	21st to end	Day	13% 6% 2 5% 3 4 4 3 6% 9% 47%	4180
September	1st to 10th	Day	15% 6% 2 6% 5% 4 5% 3 6% 6% 43%	2280
	11th to 20th	Day	13% 5% 2 5% 3 4 4 3 5% 6% 49%	2215
	21st to end	Day	18% 7% 3 6% 4 4 4 3 5% 6% 39%	2090
October	1st to 10th	Day	20% 6% 2 7% 3 4 4 3 5% 6% 40%	1953
	11th to 20th	Day	14% 6% 2 5% 4 5% 4 3 5% 7% 45%	1900
	21st to end	Day	21% 6% 2 6% 4 4 5% 3 5% 7% 39%	1952
November	1st to 10th	Day	15% 7% 1 5% 4 3 3 2 5% 5% 51%	1698
	11th to 20th	Day	17% 7% 2 5% 3 4 4 3 5% 7% 44%	1710
	21st to end	Day	17% 7% 2 5% 4 3 5% 5% 6% 6% 41%	1592
December	1st to 10th	Day	17% 10% 4 7% 4 4 4 3 6% 6% 36%	1520
	11th to 20th	Day	21% 7% 3 5% 3 4 4 4 5% 6% 39%	1906
	21st to end	Day	18% 10% 4 9% 6% 5% 5% 4 5% 6% 28%	2772
January	1st to 10th	Night	16% 7% 3 5% 3 4 4 4 5% 7% 43%	4429
	11th to 20th	Night	14% 9% 3 8% 5% 4 4 3 5% 6% 38%	4440
	21st to end	Night	22% 12% 3 5% 4 4 4 3 5% 6% 33%	4624
February	1st to 10th	Night	16% 10% 3 5% 4 3 4 3 5% 6% 40%	2470
	11th to 20th	Night	16% 8% 3 6% 5% 4 5% 4 6% 6% 39%	2240
	21st to end	Night	18% 7% 3 7% 4 4 4 3 5% 5% 40%	1884
March	1st to 10th	Night	23% 13% 4 6% 3 3 3 2 4 6% 35%	3724
	11th to 20th	Night	11% 8% 3 6% 5% 4 4 4 5% 8% 44%	3580
	21st to end	Night	17% 9% 3 8% 3 3 3 3 5% 5% 40%	3515
April	1st to 10th	Night	17% 9% 3 6% 5% 4 5% 4 5% 7% 35%	1900
	11th to 20th	Night	17% 8% 2 7% 4 4 4 3 5% 7% 38%	1875
	21st to end	Night	19% 7% 2 6% 4 3 3 3 5% 6% 41%	1889
May	1st to 10th	Night	26% 9% 3 6% 3 3 4 3 5% 8% 30%	2812
	11th to 20th	Night	25% 9% 3 7% 4 4 3 4 4 5% 32%	2495
	21st to end	Night	13% 7% 3 6% 4 5% 4 4 6% 7% 42%	2738
June	1st to 10th	Night	17% 5% 2 5% 4 4 5% 4 5% 7% 43%	1520
	11th to 20th	Night	14% 6% 2 6% 5% 4 4 4 6% 9% 41%	1520
	21st to end	Night	12% 5% 2 5% 5% 4 4 4 6% 10% 44%	1520
July	1st to 10th	Night	10% 6% 2 7% 5% 5% 6% 4 7% 9% 39%	2520
	11th to 20th	Night	11% 6% 2 6% 4 5% 5% 4 7% 10% 39%	2520
	21st to end	Night	16% 7% 2 5% 4 4 5% 4 7% 8% 37%	2739
August	1st to 10th	Night	21% 5% 3 7% 5% 5% 5% 4 5% 7% 33%	2696
	11th to 20th	Night	14% 7% 3 7% 5% 5% 4 3 5% 7% 41%	3088
	21st to end	Night	11% 5% 2 5% 4 3 4 3 5% 7% 51%	3476
September	1st to 10th	Night	15% 6% 3 6% 4 4 4 3 4 6% 47%	1900
	11th to 20th	Night	13% 6% 2 4 3 3 3 2 4 7% 53%	1963
	21st to end	Night	17% 6% 2 6% 4 3 3 3 4 6% 44%	2090
October	1st to 10th	Night	20% 6% 2 5% 4 4 3 3 5% 6% 42%	2223
	11th to 20th	Night	15% 6% 2 5% 3 3 3 2 5% 6% 49%	2280
	21st to end	Night	20% 7% 2 5% 3 3 3 4 4 6% 43%	2646
November	1st to 10th	Night	12% 6% 2 6% 3 3 4 4 5% 6% 49%	2453
	11th to 20th	Night	18% 9% 2 5% 3 4 3 2 5% 5% 45%	2470
	21st to end	Night	14% 7% 2 5% 4 4 5% 4 6% 7% 43%	2586
December	1st to 10th	Night	18% 8% 2 6% 5% 4 4 3 5% 7% 37%	2660
	11th to 20th	Night	18% 8% 2 6% 4 4 4 4 6% 6% 38%	3288
	21st to end	Night	20% 9% 4 7% 5% 4 4 3 4 6% 33%	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	25% 38% 6% 22% 6% 2	2518
	11th to 20th	Day	32% 39% 5% 16% 7% 1	2520
	21st to end	Day	39% 40% 6% 10% 5% 1	3028
February	1st to 10th	Day	18% 66% 6% 7% 3 1	1710
	11th to 20th	Day	15% 64% 2 10% 9% 1	1833
	21st to end	Day	16% 65% 5% 8% 4 1	1570
March	1st to 10th	Day	36% 41% 5% 12% 5% 1	3119
	11th to 20th	Day	20% 44% 9% 21% 6% 1	3375
	21st to end	Day	27% 40% 5% 8% 17% 3	4116
April	1st to 10th	Day	19% 65% 3 6% 5% 1	2280
	11th to 20th	Day	15% 66% 3 8% 8%	2254
	21st to end	Day	17% 65% 3 9% 5% 1	2289
May	1st to 10th	Day	35% 42% 9% 9% 5% 1	4170
	11th to 20th	Day	36% 43% 7% 11% 3	4402
	21st to end	Day	20% 42% 7% 18% 12% 1	4837
June	1st to 10th	Day	16% 66% 3 8% 6%	2660
	11th to 20th	Day	14% 66% 4 10% 6%	2660
	21st to end	Day	14% 64% 4 9% 8%	2660
July	1st to 10th	Day	29% 39% 7% 15% 9% 1	4370
	11th to 20th	Day	27% 38% 11% 15% 9%	4365
	21st to end	Day	34% 37% 6% 12% 10% 1	4661
August	1st to 10th	Day	36% 39% 8% 13% 5%	4180
	11th to 20th	Day	24% 39% 10% 21% 6%	3766
	21st to end	Day	18% 38% 7% 25% 11% 1	4180
September	1st to 10th	Day	15% 61% 6% 11% 8%	2280
	11th to 20th	Day	16% 60% 3 8% 11% 1	2215
	21st to end	Day	20% 60% 5% 8% 5% 1	2090
October	1st to 10th	Day	24% 38% 4 12% 18% 5%	3239
	11th to 20th	Day	14% 38% 5% 20% 20% 4	3140
	21st to end	Day	11% 37% 12% 18% 18% 3	3190
November	1st to 10th	Day	18% 58% 6% 11% 6% 1	1698
	11th to 20th	Day	14% 60% 4 11% 11% 1	1710
	21st to end	Day	15% 61% 6% 13% 4 1	1592
December	1st to 10th	Day	21% 61% 6% 6% 6%	1520
	11th to 20th	Day	22% 49% 8% 14% 6% 1	1906
	21st to end	Day	37% 42% 4 12% 5%	2772
January	1st to 10th	Night	25% 38% 6% 21% 6% 3	4429
	11th to 20th	Night	28% 38% 8% 16% 8% 1	4440
	21st to end	Night	37% 41% 6% 11% 5% 1	4624
February	1st to 10th	Night	16% 65% 6% 10% 4 1	2470
	11th to 20th	Night	15% 64% 2 8% 9% 2	2242
	21st to end	Night	16% 64% 3 8% 6% 2	1884
March	1st to 10th	Night	36% 41% 5% 10% 6% 1	3734
	11th to 20th	Night	18% 43% 10% 19% 9% 1	3581
	21st to end	Night	29% 41% 4 10% 13% 4	3515
April	1st to 10th	Night	18% 65% 4 8% 5%	1900
	11th to 20th	Night	13% 67% 4 8% 8%	1875
	21st to end	Night	17% 65% 3 9% 6% 1	1889
May	1st to 10th	Night	33% 43% 8% 12% 3	2818
	11th to 20th	Night	35% 44% 9% 9% 3	2496
	21st to end	Night	24% 43% 8% 16% 7% 1	2739
June	1st to 10th	Night	14% 65% 3 9% 8%	1520
	11th to 20th	Night	13% 66% 5% 10% 5%	1520
	21st to end	Night	12% 64% 4 11% 7%	1520
July	1st to 10th	Night	25% 40% 11% 13% 10% 1	2480
	11th to 20th	Night	26% 39% 9% 18% 8%	2472
	21st to end	Night	32% 37% 8% 9% 12% 1	2651
August	1st to 10th	Night	36% 40% 10% 10% 4 1	2686
	11th to 20th	Night	27% 39% 9% 20% 5%	3118
	21st to end	Night	16% 39% 7% 28% 10%	3476
September	1st to 10th	Night	14% 60% 5% 12% 8% 1	1900
	11th to 20th	Night	13% 60% 5% 9% 11% 1	1963
	21st to end	Night	19% 60% 4 8% 8% 1	2090
October	1st to 10th	Night	25% 38% 6% 16% 14% 1	3704
	11th to 20th	Night	11% 38% 5% 19% 23% 3	3779
	21st to end	Night	16% 37% 10% 23% 13% 1	4358
November	1st to 10th	Night	17% 59% 5% 10% 8% 1	2453
	11th to 20th	Night	15% 60% 3 10% 10% 2	2470
	21st to end	Night	15% 61% 6% 13% 5% 1	2586
December	1st to 10th	Night	21% 60% 4 10% 5%	2660
	11th to 20th	Night	22% 50% 6% 10% 10% 2	3288
	21st to end	Night	34% 39% 8% 12% 6%	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	31% 22% 30% 14% 2	180
	11th to 20th	Day	35% 24% 30% 9% 1	180
	21st to end	Day	23% 31% 31% 11% 2 2	270
February	1st to 10th	Day	31% 28% 32% 8% 1	270
	11th to 20th	Day	31% 28% 32% 8% 1	432
	21st to end	Day	31% 23% 33% 9% 3	382
March	1st to 10th	Day	30% 23% 29% 15% 3	460
	11th to 20th	Day	27% 26% 30% 13% 3 1	460
	21st to end	Day	31% 22% 30% 11% 4 1	506
April	1st to 10th	Day	29% 22% 31% 12% 6% 1	460
	11th to 20th	Day	26% 25% 30% 12% 6% 1	452
	21st to end	Day	29% 18% 33% 13% 6% 1	460
May	1st to 10th	Day	34% 19% 25% 15% 6% 2	463
	11th to 20th	Day	23% 15% 35% 19% 8% 1	487
	21st to end	Day	20% 11% 29% 28% 11% 2	529
June	1st to 10th	Day	19% 13% 34% 22% 11% 1	490
	11th to 20th	Day	17% 13% 31% 27% 11% 1	490
	21st to end	Day	16% 15% 32% 26% 11% 1	490
July	1st to 10th	Day	14% 11% 29% 27% 14% 5%	485
	11th to 20th	Day	11% 7% 31% 32% 16% 3	484
	21st to end	Day	14% 8% 34% 31% 12% 1	532
August	1st to 10th	Day	15% 6% 29% 29% 14% 6%	486
	11th to 20th	Day	15% 9% 25% 32% 14% 6%	479
	21st to end	Day	14% 10% 27% 27% 15% 6%	539
September	1st to 10th	Day	20% 12% 24% 21% 17% 6%	490
	11th to 20th	Day	14% 10% 30% 22% 13% 11%	490
	21st to end	Day	23% 12% 28% 23% 9% 5%	490
October	1st to 10th	Day	26% 14% 24% 20% 12% 5%	490
	11th to 20th	Day	18% 19% 31% 20% 10% 2	490
	21st to end	Day	24% 16% 32% 18% 9% 1	466
November	1st to 10th	Day	20% 17% 30% 21% 9% 2	374
	11th to 20th	Day	26% 22% 29% 17% 4 1	370
	21st to end	Day	27% 23% 28% 16% 4 2	252
December	1st to 10th	Day	28% 30% 26% 10% 6%	180
	11th to 20th	Day	37% 23% 27% 11% 2	180
	21st to end	Day	24% 25% 36% 10% 4 1	198
January	1st to 10th	Night	19% 24% 39% 16% 3	760
	11th to 20th	Night	25% 21% 33% 18% 4	760
	21st to end	Night	20% 22% 38% 18% 2	836
February	1st to 10th	Night	22% 19% 39% 18% 1	760
	11th to 20th	Night	24% 25% 36% 13% 1	743
	21st to end	Night	29% 21% 33% 15% 2	628
March	1st to 10th	Night	24% 23% 33% 17% 3	760
	11th to 20th	Night	23% 23% 33% 16% 3 1	760
	21st to end	Night	22% 22% 35% 16% 5%	836
April	1st to 10th	Night	22% 22% 37% 16% 4	760
	11th to 20th	Night	22% 18% 34% 21% 5%	751
	21st to end	Night	23% 17% 32% 23% 4	749
May	1st to 10th	Night	26% 16% 31% 23% 4	561
	11th to 20th	Night	20% 13% 37% 23% 6% 1	374
	21st to end	Night	16% 9% 27% 36% 11% 1	411
June	1st to 10th	Night	18% 7% 29% 34% 11% 1	380
	11th to 20th	Night	13% 7% 34% 32% 13% 1	380
	21st to end	Night	12% 7% 29% 42% 10%	380
July	1st to 10th	Night	13% 5% 24% 37% 19% 1	370
	11th to 20th	Night	13% 3 26% 42% 15% 1	368
	21st to end	Night	12% 5% 26% 39% 17% 1	416
August	1st to 10th	Night	12% 2 25% 42% 18% 2	490
	11th to 20th	Night	14% 5% 22% 37% 21% 1	741
	21st to end	Night	15% 5% 21% 37% 21% 2	836
September	1st to 10th	Night	16% 7% 24% 35% 16% 2	760
	11th to 20th	Night	15% 7% 25% 30% 19% 4	760
	21st to end	Night	20% 7% 25% 32% 15% 2	760
October	1st to 10th	Night	22% 11% 27% 25% 13% 2	760
	11th to 20th	Night	18% 14% 33% 28% 8%	760
	21st to end	Night	25% 13% 34% 21% 7%	836
November	1st to 10th	Night	15% 14% 37% 23% 10% 1	755
	11th to 20th	Night	23% 18% 31% 20% 7% 1	760
	21st to end	Night	19% 20% 34% 20% 6%	760
December	1st to 10th	Night	25% 20% 33% 17% 5%	760
	11th to 20th	Night	23% 19% 36% 19% 3	760
	21st to end	Night	25% 20% 36% 16% 2	836

Page generated at 2024-11-01 22:47:45. Version ac07

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