Pardee Reservoir Recreation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pardee Reservoir Recreation Area clear sky chart from 2005-11-06 to 2024-04-10.

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	10% 4 2 3 3 2 3 3 4 5% 61%	83320
	Night	12% 4 2 3 3 2 3 3 4 5% 57%	85554
Transparency	Day	26% 3 8% 20% 23% 20%	83035
	Night	30% 3 9% 20% 21% 17%	85360
Seeing	Day	10% 4 19% 33% 26% 8%	14395
	Night	12% 2 8% 39% 33% 7%	23895

By Month

Percentage Cloud Cover SW (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	24% 8% 2 4 4 2 3 4 5% 7% 37%	2539
	11th to 20th	Day	22% 8% 3 7% 7% 4 4 4 3 4 34%	2796
	21st to end	Day	22% 8% 3 7% 5% 3 5% 5% 5% 7% 29%	3146
February	1st to 10th	Day	20% 6% 1 4 3 2 4 4 4 5% 47%	1710
	11th to 20th	Day	16% 5% 3 4 4 2 4 5% 4 7% 46%	1814
	21st to end	Day	17% 6% 2 4 5% 3 4 3 4 5% 47%	1570
March	1st to 10th	Day	17% 9% 4 7% 7% 3 5% 5% 7% 6% 31%	3217
	11th to 20th	Day	13% 4 1 3 2 2 3 3 4 6% 57%	3490
	21st to end	Day	14% 8% 3 5% 5% 3 5% 6% 7% 8% 37%	3996
April	1st to 10th	Day	14% 6% 2 3 4 3 4 4 5% 7% 50%	2270
	11th to 20th	Day	11% 4 2 3 3 2 4 4 4 6% 57%	2129
	21st to end	Day	9% 3 1 2 3 2 3 3 4 7% 63%	2160
May	1st to 10th	Day	5% 4 1 3 3 2 2 4 4 6% 65%	2167
	11th to 20th	Day	5% 3 1 3 3 2 3 3 3 6% 68%	2467
	21st to end	Day	6% 3 1 3 3 2 3 4 4 6% 65%	2723
June	1st to 10th	Day	4 3 2 3 3 2 2 3 3 7% 69%	2520
	11th to 20th	Day	1 1 1 1 1 2 2 3 5% 82%	2520
	21st to end	Day	2 1 1 1 1 1 1 2 2 3 84%	2520
July	1st to 10th	Day	1 1 1 1 1 1 2 4 88%	2520
	11th to 20th	Day	2 1 1 1 1 1 2 3 3 85%	2520
	21st to end	Day	1 1 1 2 2 1 2 2 3 4 83%	2551
August	1st to 10th	Day	2 1 1 2 1 1 2 2 2 3 83%	2328
	11th to 20th	Day	1 1 1 1 2 2 3 4 86%	2129
	21st to end	Day	1 1 1 1 1 1 1 2 2 89%	2376
September	1st to 10th	Day	2 1 1 1 1 1 2 3 88%	2160
	11th to 20th	Day	2 1 1 1 2 2 3 3 3 5% 78%	2160
	21st to end	Day	2 2 1 1 2 1 2 2 3 4 79%	1956
October	1st to 10th	Day	4 2 1 2 3 2 3 3 3 5% 73%	1800
	11th to 20th	Day	5% 3 1 2 3 2 3 4 4 5% 70%	1800
	21st to end	Day	6% 2 1 3 4 2 3 3 4 5% 66%	1980
November	1st to 10th	Day	11% 4 1 3 3 2 4 3 6% 8% 56%	1709
	11th to 20th	Day	11% 4 1 4 4 3 4 4 5% 6% 54%	1710
	21st to end	Day	12% 3 2 3 4 2 3 4 5% 7% 55%	1625
December	1st to 10th	Day	14% 5% 1 5% 4 3 5% 4 4 6% 49%	1520
	11th to 20th	Day	28% 8% 3 5% 4 3 3 4 4 6% 32%	1928
	21st to end	Day	14% 6% 3 5% 6% 4 6% 6% 7% 9% 35%	2794
January	1st to 10th	Night	16% 7% 2 5% 4 3 4 4 5% 6% 43%	4406
	11th to 20th	Night	22% 6% 3 6% 6% 3 4 4 5% 6% 35%	4168
	21st to end	Night	24% 7% 3 5% 6% 3 4 4 4 6% 33%	4521
February	1st to 10th	Night	18% 5% 2 4 3 2 3 3 4 5% 51%	2470
	11th to 20th	Night	15% 4 2 4 4 2 4 4 4 7% 49%	2252
	21st to end	Night	17% 6% 2 3 3 2 3 4 3 5% 51%	1884
March	1st to 10th	Night	21% 9% 3 6% 5% 3 4 4 4 5% 35%	3653
	11th to 20th	Night	17% 4 2 3 3 2 2 3 3 5% 57%	3490
	21st to end	Night	21% 7% 2 5% 4 3 4 4 5% 6% 38%	3657
April	1st to 10th	Night	13% 4 2 4 4 2 4 4 4 6% 52%	1900
	11th to 20th	Night	11% 4 2 3 3 2 4 3 4 6% 57%	1779
	21st to end	Night	6% 3 1 3 3 2 4 3 4 7% 63%	1800
May	1st to 10th	Night	7% 3 1 3 2 2 3 4 4 6% 66%	1792
	11th to 20th	Night	6% 3 1 2 2 1 2 2 4 7% 69%	1422
	21st to end	Night	4 3 1 2 2 2 3 4 4 6% 70%	1552
June	1st to 10th	Night	4 2 1 3 3 1 3 3 4 5% 70%	1440
	11th to 20th	Night	1 1 1 1 2 2 3 4 83%	1440
	21st to end	Night	2 1 1 1 2 1 1 2 2 3 85%	1440
July	1st to 10th	Night	1 1 1 1 2 2 3 89%	1440
	11th to 20th	Night	2 1 1 1 1 1 1 2 3 3 84%	1440
	21st to end	Night	1 1 1 2 2 2 2 3 2 4 79%	1763
August	1st to 10th	Night	2 1 1 2 1 2 3 3 3 82%	1611
	11th to 20th	Night	1 1 2 2 2 2 4 6% 80%	1771
	21st to end	Night	1 1 1 1 1 1 2 2 88%	1980
September	1st to 10th	Night	2 1 1 1 1 1 2 3 88%	1800
	11th to 20th	Night	3 1 1 1 2 1 1 2 3 4 81%	1800
	21st to end	Night	2 1 1 1 2 2 2 2 4 82%	2000
October	1st to 10th	Night	5% 2 1 2 3 2 2 3 3 4 73%	2160
	11th to 20th	Night	5% 2 1 2 2 1 2 3 3 4 73%	2160
	21st to end	Night	6% 2 2 3 2 2 3 3 5% 72%	2376
November	1st to 10th	Night	11% 4 2 2 3 2 3 3 4 6% 60%	2369
	11th to 20th	Night	10% 3 1 3 3 2 3 4 4 7% 58%	2470
	21st to end	Night	12% 4 1 3 3 2 3 4 3 6% 58%	2550
December	1st to 10th	Night	16% 5% 2 4 3 2 3 4 4 6% 51%	2660
	11th to 20th	Night	24% 5% 3 5% 5% 3 3 4 5% 6% 35%	3276
	21st to end	Night	18% 7% 3 6% 5% 3 5% 6% 5% 6% 34%	4862

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	49% 3 14% 25% 7% 2	2539
	11th to 20th	Day	56% 3 8% 15% 10% 7%	2796
	21st to end	Day	54% 4 11% 17% 11% 3	3146
February	1st to 10th	Day	41% 3 10% 23% 16% 8%	1710
	11th to 20th	Day	38% 4 9% 21% 22% 6%	1824
	21st to end	Day	40% 3 9% 24% 19% 4	1570
March	1st to 10th	Day	51% 6% 12% 16% 14% 2	3217
	11th to 20th	Day	29% 3 10% 32% 15% 10%	3490
	21st to end	Day	42% 6% 15% 24% 11% 2	3996
April	1st to 10th	Day	35% 4 12% 25% 17% 7%	2270
	11th to 20th	Day	28% 4 11% 27% 23% 7%	2132
	21st to end	Day	22% 3 12% 32% 26% 5%	2160
May	1st to 10th	Day	21% 3 9% 27% 31% 9%	2167
	11th to 20th	Day	19% 2 7% 29% 31% 11%	2470
	21st to end	Day	20% 3 13% 29% 26% 8%	2724
June	1st to 10th	Day	18% 3 9% 24% 31% 14%	2520
	11th to 20th	Day	7% 2 6% 23% 33% 29%	2520
	21st to end	Day	9% 1 1 12% 34% 43%	2520
July	1st to 10th	Day	5% 1 1 9% 24% 61%	2451
	11th to 20th	Day	7% 1 2 11% 25% 54%	2445
	21st to end	Day	9% 1 1 6% 26% 56%	2409
August	1st to 10th	Day	10% 1 2 9% 28% 50%	2312
	11th to 20th	Day	5% 2 1 9% 32% 51%	2129
	21st to end	Day	6% 1 1 9% 34% 49%	2376
September	1st to 10th	Day	5% 1 2 8% 28% 56%	2160
	11th to 20th	Day	11% 3 3 20% 39% 25%	2160
	21st to end	Day	11% 2 3 19% 36% 30%	1956
October	1st to 10th	Day	15% 2 6% 19% 27% 31%	1800
	11th to 20th	Day	17% 3 6% 21% 25% 28%	1800
	21st to end	Day	20% 3 6% 21% 29% 22%	1980
November	1st to 10th	Day	28% 2 9% 26% 22% 12%	1709
	11th to 20th	Day	31% 4 10% 26% 23% 6%	1710
	21st to end	Day	29% 3 9% 24% 26% 9%	1625
December	1st to 10th	Day	37% 4 11% 22% 17% 9%	1520
	11th to 20th	Day	55% 3 8% 16% 13% 4	1928
	21st to end	Day	45% 5% 20% 18% 9% 3	2794
January	1st to 10th	Night	41% 4 18% 23% 9% 3	4406
	11th to 20th	Night	50% 4 14% 15% 10% 8%	4168
	21st to end	Night	52% 4 10% 17% 12% 5%	4521
February	1st to 10th	Night	38% 3 8% 23% 19% 9%	2470
	11th to 20th	Night	35% 4 8% 24% 22% 8%	2253
	21st to end	Night	37% 3 8% 28% 18% 6%	1884
March	1st to 10th	Night	51% 5% 12% 15% 14% 4	3653
	11th to 20th	Night	31% 3 9% 27% 17% 12%	3490
	21st to end	Night	46% 4 12% 23% 11% 4	3657
April	1st to 10th	Night	32% 5% 12% 24% 21% 5%	1900
	11th to 20th	Night	28% 3 13% 26% 19% 10%	1779
	21st to end	Night	22% 4 12% 32% 24% 6%	1800
May	1st to 10th	Night	19% 3 11% 25% 30% 11%	1792
	11th to 20th	Night	17% 2 11% 32% 26% 12%	1422
	21st to end	Night	16% 3 15% 35% 24% 7%	1552
June	1st to 10th	Night	17% 3 11% 27% 28% 13%	1440
	11th to 20th	Night	6% 3 7% 22% 35% 27%	1440
	21st to end	Night	8% 2 2 14% 33% 41%	1440
July	1st to 10th	Night	4 2 1 11% 25% 58%	1400
	11th to 20th	Night	8% 1 2 10% 25% 54%	1392
	21st to end	Night	11% 2 2 7% 25% 53%	1665
August	1st to 10th	Night	9% 2 1 13% 28% 47%	1602
	11th to 20th	Night	8% 2 1 11% 29% 49%	1771
	21st to end	Night	6% 1 1 10% 33% 50%	1980
September	1st to 10th	Night	6% 1 2 7% 30% 54%	1800
	11th to 20th	Night	9% 3 3 19% 41% 25%	1800
	21st to end	Night	10% 1 3 19% 35% 32%	2000
October	1st to 10th	Night	17% 3 5% 19% 27% 29%	2160
	11th to 20th	Night	16% 3 6% 20% 26% 30%	2160
	21st to end	Night	16% 2 5% 21% 30% 25%	2376
November	1st to 10th	Night	26% 4 9% 23% 21% 18%	2369
	11th to 20th	Night	26% 3 10% 26% 26% 10%	2470
	21st to end	Night	29% 3 8% 22% 27% 11%	2550
December	1st to 10th	Night	36% 3 11% 21% 17% 12%	2660
	11th to 20th	Night	50% 4 8% 17% 16% 5%	3276
	21st to end	Night	50% 5% 15% 18% 9% 4	4862

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	34% 8% 14% 22% 17% 5%	180
	11th to 20th	Day	20% 2 20% 29% 21% 8%	332
	21st to end	Day	20% 3 18% 27% 25% 7%	407
February	1st to 10th	Day	24% 8% 14% 24% 24% 6%	370
	11th to 20th	Day	19% 6% 23% 28% 18% 5%	439
	21st to end	Day	19% 7% 22% 32% 16% 3	382
March	1st to 10th	Day	23% 6% 24% 30% 14% 3	460
	11th to 20th	Day	22% 6% 22% 27% 18% 6%	460
	21st to end	Day	21% 7% 24% 27% 18% 4	506
April	1st to 10th	Day	18% 7% 23% 28% 19% 5%	457
	11th to 20th	Day	13% 9% 27% 29% 17% 6%	412
	21st to end	Day	8% 7% 24% 31% 21% 9%	420
May	1st to 10th	Day	9% 9% 27% 29% 21% 6%	423
	11th to 20th	Day	8% 7% 26% 28% 23% 8%	448
	21st to end	Day	8% 6% 18% 33% 26% 9%	485
June	1st to 10th	Day	5% 6% 20% 35% 25% 10%	450
	11th to 20th	Day	3 5% 23% 39% 24% 6%	450
	21st to end	Day	2 2 17% 41% 29% 9%	450
July	1st to 10th	Day	1 1 16% 44% 29% 8%	446
	11th to 20th	Day	2 11% 41% 37% 9%	444
	21st to end	Day	1 11% 43% 33% 11%	487
August	1st to 10th	Day	4 1 15% 42% 30% 10%	447
	11th to 20th	Day	1 19% 38% 30% 12%	437
	21st to end	Day	1 1 13% 43% 32% 10%	495
September	1st to 10th	Day	3 1 13% 45% 30% 9%	450
	11th to 20th	Day	3 2 20% 38% 30% 8%	450
	21st to end	Day	2 4 19% 36% 30% 9%	450
October	1st to 10th	Day	4 5% 19% 34% 28% 10%	450
	11th to 20th	Day	6% 4 15% 25% 38% 12%	450
	21st to end	Day	8% 4 16% 31% 32% 9%	495
November	1st to 10th	Day	14% 2 12% 28% 32% 11%	305
	11th to 20th	Day	13% 2 13% 30% 32% 11%	270
	21st to end	Day	12% 1 17% 30% 32% 8%	230
December	1st to 10th	Day	19% 2 16% 29% 23% 12%	180
	11th to 20th	Day	21% 4 21% 23% 22% 10%	180
	21st to end	Day	22% 5% 17% 26% 24% 6%	198
January	1st to 10th	Night	22% 2 10% 34% 23% 9%	760
	11th to 20th	Night	16% 3 9% 39% 25% 9%	760
	21st to end	Night	21% 2 8% 36% 26% 7%	836
February	1st to 10th	Night	21% 2 11% 37% 23% 6%	760
	11th to 20th	Night	17% 3 12% 36% 24% 7%	744
	21st to end	Night	21% 3 10% 44% 19% 3	628
March	1st to 10th	Night	23% 2 12% 36% 22% 4	760
	11th to 20th	Night	21% 3 10% 35% 24% 7%	760
	21st to end	Night	21% 3 12% 37% 25% 2	836
April	1st to 10th	Night	15% 2 11% 44% 27% 2	760
	11th to 20th	Night	13% 3 13% 39% 26% 6%	711
	21st to end	Night	8% 1 10% 44% 31% 6%	720
May	1st to 10th	Night	8% 2 11% 43% 30% 6%	712
	11th to 20th	Night	6% 2 8% 38% 42% 6%	360
	21st to end	Night	5% 1 7% 39% 44% 4	389
June	1st to 10th	Night	5% 6% 42% 41% 6%	360
	11th to 20th	Night	1 1 6% 48% 41% 4	360
	21st to end	Night	2 5% 42% 47% 4	360
July	1st to 10th	Night	1 36% 59% 3	350
	11th to 20th	Night	3 2 37% 52% 5%	348
	21st to end	Night	2 1 1 30% 58% 10%	581
August	1st to 10th	Night	3 2 33% 56% 6%	537
	11th to 20th	Night	1 5% 41% 45% 8%	703
	21st to end	Night	2 2 40% 50% 7%	792
September	1st to 10th	Night	2 2 39% 49% 8%	720
	11th to 20th	Night	4 1 4 38% 44% 10%	720
	21st to end	Night	2 1 6% 37% 44% 10%	720
October	1st to 10th	Night	6% 1 7% 40% 37% 10%	720
	11th to 20th	Night	7% 2 7% 37% 38% 9%	720
	21st to end	Night	7% 1 8% 38% 31% 15%	792
November	1st to 10th	Night	13% 2 5% 39% 29% 12%	740
	11th to 20th	Night	12% 1 8% 43% 30% 7%	760
	21st to end	Night	13% 2 9% 39% 28% 9%	760
December	1st to 10th	Night	19% 1 8% 40% 24% 8%	760
	11th to 20th	Night	25% 1 8% 37% 24% 5%	760
	21st to end	Night	23% 4 12% 37% 20% 5%	836

Page generated at 2024-04-07 06:28:12. Version ac07

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