Newport State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Newport State Park clear sky chart from 2005-11-06 to 2024-11-28.

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% 9% 3 7% 5% 5% 4 4 5% 7% 38%	101677
	Night	15% 11% 4 8% 5% 4 4 3 5% 6% 34%	97944
Transparency	Day	44% 6% 14% 24% 11% 1	105196
	Night	49% 5% 13% 21% 10% 1	102566
Seeing	Day	16% 9% 28% 29% 15% 3	16074
	Night	19% 9% 28% 29% 13% 2	25964

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% 13% 7% 11% 7% 6% 6% 4 5% 6% 23%	2527
	11th to 20th	Day	17% 12% 6% 14% 9% 10% 7% 3 4 5% 13%	2530
	21st to end	Day	15% 15% 6% 9% 6% 5% 5% 4 6% 6% 21%	2783
February	1st to 10th	Day	10% 10% 4 10% 6% 6% 5% 5% 6% 6% 32%	1592
	11th to 20th	Day	10% 12% 4 6% 5% 6% 5% 5% 6% 8% 34%	1848
	21st to end	Day	12% 11% 3 10% 6% 5% 5% 4 5% 7% 32%	1570
March	1st to 10th	Day	11% 9% 3 6% 4 4 4 3 6% 7% 42%	3120
	11th to 20th	Day	9% 10% 4 11% 5% 5% 4 4 5% 7% 36%	3279
	21st to end	Day	19% 10% 4 9% 5% 4 5% 4 6% 6% 30%	4119
April	1st to 10th	Day	15% 11% 4 7% 5% 5% 5% 4 6% 7% 31%	2280
	11th to 20th	Day	19% 8% 2 7% 4 4 4 3 6% 7% 36%	2290
	21st to end	Day	16% 8% 2 7% 5% 4 3 4 6% 7% 37%	2470
May	1st to 10th	Day	12% 6% 2 6% 5% 4 4 3 5% 7% 44%	4109
	11th to 20th	Day	11% 7% 3 7% 5% 4 4 4 6% 7% 44%	4399
	21st to end	Day	11% 6% 2 7% 5% 5% 5% 4 6% 8% 41%	4824
June	1st to 10th	Day	11% 5% 2 6% 5% 4 4 4 6% 7% 46%	2660
	11th to 20th	Day	12% 5% 2 6% 4 5% 5% 4 5% 9% 42%	2660
	21st to end	Day	11% 6% 2 6% 4 5% 5% 4 6% 9% 44%	2660
July	1st to 10th	Day	15% 6% 2 5% 4 4 4 4 6% 10% 42%	4440
	11th to 20th	Day	5% 3 1 4 4 4 4 4 6% 9% 56%	4440
	21st to end	Day	8% 5% 2 5% 3 4 4 3 6% 7% 53%	4813
August	1st to 10th	Day	7% 5% 2 7% 5% 4 5% 5% 7% 8% 45%	4405
	11th to 20th	Day	13% 4 2 5% 3 3 4 3 4 7% 52%	4044
	21st to end	Day	12% 5% 2 6% 4 4 4 4 4 7% 47%	4190
September	1st to 10th	Day	12% 7% 2 6% 4 4 5% 3 6% 8% 44%	2280
	11th to 20th	Day	12% 5% 2 5% 4 4 4 4 6% 9% 46%	2128
	21st to end	Day	14% 5% 2 7% 4 5% 5% 4 6% 9% 38%	2090
October	1st to 10th	Day	17% 9% 3 5% 4 4 4 4 4 7% 41%	2066
	11th to 20th	Day	23% 12% 3 7% 5% 4 4 3 5% 5% 28%	1786
	21st to end	Day	21% 13% 3 8% 6% 5% 5% 4 5% 5% 26%	1881
November	1st to 10th	Day	16% 12% 3 7% 6% 4 4 3 5% 7% 34%	1762
	11th to 20th	Day	16% 16% 5% 10% 6% 5% 5% 4 5% 6% 22%	1800
	21st to end	Day	20% 14% 5% 11% 6% 5% 4 3 5% 6% 21%	1611
December	1st to 10th	Day	16% 16% 7% 11% 7% 5% 5% 4 5% 5% 20%	1520
	11th to 20th	Day	18% 16% 6% 13% 7% 6% 5% 3 4 5% 16%	1918
	21st to end	Day	22% 21% 7% 11% 5% 5% 5% 2 4 4 14%	2783
January	1st to 10th	Night	14% 15% 6% 13% 5% 4 4 3 4 6% 25%	4428
	11th to 20th	Night	13% 16% 6% 15% 9% 8% 7% 3 4 5% 14%	4440
	21st to end	Night	14% 16% 7% 10% 5% 5% 5% 4 5% 6% 23%	4884
February	1st to 10th	Night	10% 14% 5% 10% 6% 5% 5% 4 5% 6% 29%	2583
	11th to 20th	Night	11% 11% 4 10% 6% 4 4 4 6% 6% 33%	2218
	21st to end	Night	16% 11% 4 8% 6% 5% 5% 4 6% 6% 30%	1884
March	1st to 10th	Night	14% 10% 3 6% 3 3 3 2 5% 7% 43%	3733
	11th to 20th	Night	9% 10% 4 8% 5% 4 4 4 5% 8% 38%	3680
	21st to end	Night	17% 10% 3 9% 5% 5% 5% 4 5% 7% 30%	3540
April	1st to 10th	Night	18% 12% 3 9% 5% 4 4 3 5% 6% 31%	1900
	11th to 20th	Night	20% 8% 3 6% 5% 3 4 3 5% 5% 37%	1838
	21st to end	Night	16% 9% 3 8% 6% 4 4 3 5% 6% 36%	1710
May	1st to 10th	Night	16% 7% 2 7% 4 4 4 3 5% 7% 40%	2784
	11th to 20th	Night	13% 8% 3 7% 5% 5% 6% 4 6% 6% 38%	2506
	21st to end	Night	18% 6% 2 5% 5% 5% 5% 4 6% 7% 39%	2743
June	1st to 10th	Night	13% 6% 2 6% 4 5% 4 5% 7% 6% 43%	1520
	11th to 20th	Night	13% 7% 3 7% 5% 4 5% 4 7% 8% 39%	1520
	21st to end	Night	12% 7% 2 5% 3 4 4 3 6% 9% 45%	1520
July	1st to 10th	Night	14% 5% 3 7% 5% 5% 5% 4 5% 6% 42%	2530
	11th to 20th	Night	7% 4 1 5% 4 4 4 4 5% 7% 55%	2530
	21st to end	Night	10% 5% 2 6% 4 4 4 4 4 7% 50%	2750
August	1st to 10th	Night	11% 5% 2 7% 4 4 5% 4 5% 8% 45%	2534
	11th to 20th	Night	12% 4 2 4 3 3 4 3 6% 8% 51%	2785
	21st to end	Night	11% 6% 2 7% 4 5% 3 3 4 6% 49%	3463
September	1st to 10th	Night	11% 5% 2 5% 4 3 3 3 5% 6% 51%	1900
	11th to 20th	Night	14% 5% 2 5% 3 3 3 4 5% 7% 48%	2032
	21st to end	Night	16% 8% 2 7% 4 4 4 3 5% 6% 42%	2090
October	1st to 10th	Night	18% 8% 2 6% 4 4 3 3 4 7% 39%	2110
	11th to 20th	Night	21% 11% 2 8% 4 4 4 4 5% 6% 32%	2394
	21st to end	Night	24% 13% 3 7% 5% 4 4 3 5% 6% 27%	2717
November	1st to 10th	Night	15% 13% 3 7% 4 4 4 3 6% 7% 34%	2536
	11th to 20th	Night	18% 16% 5% 11% 6% 5% 4 3 4 4 25%	2600
	21st to end	Night	19% 18% 6% 9% 5% 4 5% 4 5% 6% 21%	2719
December	1st to 10th	Night	16% 17% 7% 11% 6% 4 5% 3 5% 6% 20%	2660
	11th to 20th	Night	16% 15% 6% 13% 7% 5% 4 4 5% 5% 18%	3279
	21st to end	Night	25% 21% 8% 11% 4 4 3 3 3 3 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	60% 5% 17% 14% 3	2528
	11th to 20th	Day	68% 8% 14% 8% 2	2530
	21st to end	Day	63% 5% 16% 12% 3	2783
February	1st to 10th	Day	49% 7% 16% 22% 6%	1592
	11th to 20th	Day	47% 8% 16% 19% 9% 1	1858
	21st to end	Day	50% 7% 13% 19% 8% 2	1570
March	1st to 10th	Day	40% 6% 15% 23% 14% 1	3120
	11th to 20th	Day	45% 7% 15% 22% 9% 2	3279
	21st to end	Day	53% 8% 12% 19% 7%	4119
April	1st to 10th	Day	51% 5% 13% 20% 10% 1	2280
	11th to 20th	Day	48% 5% 10% 24% 12% 2	2290
	21st to end	Day	45% 7% 11% 20% 16% 2	2470
May	1st to 10th	Day	39% 7% 11% 27% 15% 1	4147
	11th to 20th	Day	36% 7% 13% 29% 14% 1	4403
	21st to end	Day	38% 8% 13% 21% 17% 4	4837
June	1st to 10th	Day	35% 6% 15% 29% 14% 2	2660
	11th to 20th	Day	38% 7% 13% 25% 16% 1	2660
	21st to end	Day	36% 8% 17% 25% 13% 1	2660
July	1st to 10th	Day	37% 7% 16% 27% 12% 1	4371
	11th to 20th	Day	24% 7% 14% 41% 14% 1	4365
	21st to end	Day	29% 7% 14% 30% 19% 1	4662
August	1st to 10th	Day	35% 8% 16% 29% 12% 1	4390
	11th to 20th	Day	32% 6% 17% 32% 12%	4083
	21st to end	Day	37% 6% 16% 28% 12% 1	4189
September	1st to 10th	Day	37% 8% 14% 28% 13% 1	2280
	11th to 20th	Day	34% 6% 22% 29% 8%	2128
	21st to end	Day	41% 8% 17% 25% 9%	2090
October	1st to 10th	Day	29% 4 13% 33% 20% 1	3430
	11th to 20th	Day	52% 4 11% 23% 10%	2950
	21st to end	Day	53% 6% 15% 20% 6%	3081
November	1st to 10th	Day	50% 6% 14% 20% 10%	1762
	11th to 20th	Day	62% 5% 15% 13% 5%	1800
	21st to end	Day	64% 6% 16% 12% 2	1611
December	1st to 10th	Day	64% 6% 14% 13% 2	1520
	11th to 20th	Day	69% 4 11% 11% 4	1915
	21st to end	Day	73% 5% 9% 11% 3	2783
January	1st to 10th	Night	58% 5% 15% 19% 3	4428
	11th to 20th	Night	68% 5% 17% 8% 2	4440
	21st to end	Night	62% 5% 17% 12% 3	4884
February	1st to 10th	Night	54% 5% 12% 21% 8% 1	2583
	11th to 20th	Night	49% 6% 13% 21% 9% 2	2219
	21st to end	Night	53% 5% 15% 19% 8% 1	1884
March	1st to 10th	Night	42% 4 17% 28% 8% 1	3733
	11th to 20th	Night	44% 5% 12% 27% 12% 1	3680
	21st to end	Night	51% 7% 13% 20% 8% 1	3540
April	1st to 10th	Night	53% 5% 9% 18% 12% 2	1900
	11th to 20th	Night	47% 5% 10% 21% 13% 3	1838
	21st to end	Night	49% 5% 11% 19% 14% 3	1710
May	1st to 10th	Night	43% 7% 12% 22% 14% 2	2811
	11th to 20th	Night	42% 7% 12% 25% 13% 1	2507
	21st to end	Night	44% 6% 13% 18% 11% 8%	2751
June	1st to 10th	Night	37% 7% 10% 28% 15% 2	1520
	11th to 20th	Night	40% 8% 13% 20% 18% 2	1520
	21st to end	Night	36% 7% 16% 26% 14% 2	1520
July	1st to 10th	Night	41% 6% 12% 23% 13% 4	2490
	11th to 20th	Night	27% 6% 15% 34% 16% 2	2482
	21st to end	Night	34% 6% 12% 22% 24% 2	2662
August	1st to 10th	Night	37% 7% 14% 26% 15% 1	2525
	11th to 20th	Night	31% 5% 16% 32% 15% 1	2812
	21st to end	Night	37% 5% 14% 24% 18% 2	3463
September	1st to 10th	Night	33% 6% 13% 29% 16% 2	1900
	11th to 20th	Night	36% 5% 15% 32% 12% 1	2032
	21st to end	Night	43% 5% 16% 24% 11% 1	2090
October	1st to 10th	Night	37% 4 10% 35% 13% 1	3526
	11th to 20th	Night	43% 5% 14% 23% 14%	3969
	21st to end	Night	52% 4 13% 22% 9%	4467
November	1st to 10th	Night	48% 6% 14% 23% 9% 1	2536
	11th to 20th	Night	61% 6% 12% 12% 8%	2600
	21st to end	Night	63% 5% 15% 14% 2 1	2719
December	1st to 10th	Night	65% 5% 14% 14% 2	2660
	11th to 20th	Night	65% 5% 14% 12% 3	3281
	21st to end	Night	74% 5% 9% 8% 2	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	15% 16% 37% 21% 10%	270
	11th to 20th	Day	20% 16% 37% 20% 4 1	270
	21st to end	Day	22% 10% 29% 32% 6%	297
February	1st to 10th	Day	13% 15% 43% 19% 7% 2	270
	11th to 20th	Day	13% 20% 42% 20% 5%	270
	21st to end	Day	19% 12% 49% 17% 4	225
March	1st to 10th	Day	14% 13% 44% 23% 6%	270
	11th to 20th	Day	14% 13% 34% 27% 9% 2	337
	21st to end	Day	21% 13% 30% 27% 8% 1	506
April	1st to 10th	Day	20% 13% 32% 25% 9% 1	460
	11th to 20th	Day	20% 13% 29% 25% 10% 2	452
	21st to end	Day	18% 10% 29% 28% 13% 2	460
May	1st to 10th	Day	17% 11% 33% 27% 10% 2	477
	11th to 20th	Day	15% 6% 28% 35% 14% 2	675
	21st to end	Day	14% 6% 26% 32% 18% 4	734
June	1st to 10th	Day	11% 5% 30% 35% 15% 3	680
	11th to 20th	Day	15% 4 25% 37% 16% 3	680
	21st to end	Day	13% 4 24% 35% 19% 4	680
July	1st to 10th	Day	9% 2 18% 40% 25% 5%	671
	11th to 20th	Day	9% 4 23% 35% 23% 6%	668
	21st to end	Day	7% 3 21% 37% 26% 6%	739
August	1st to 10th	Day	7% 3 19% 38% 26% 6%	671
	11th to 20th	Day	13% 3 16% 32% 28% 8%	479
	21st to end	Day	16% 5% 19% 29% 25% 6%	539
September	1st to 10th	Day	16% 9% 20% 31% 18% 7%	490
	11th to 20th	Day	12% 5% 20% 34% 23% 5%	490
	21st to end	Day	17% 9% 22% 30% 17% 6%	490
October	1st to 10th	Day	19% 11% 30% 25% 12% 3	466
	11th to 20th	Day	22% 14% 34% 23% 7%	300
	21st to end	Day	29% 15% 35% 17% 5%	330
November	1st to 10th	Day	18% 12% 36% 26% 8%	300
	11th to 20th	Day	18% 21% 38% 19% 4	300
	21st to end	Day	23% 20% 37% 17% 3	291
December	1st to 10th	Day	22% 19% 36% 16% 6% 1	270
	11th to 20th	Day	25% 19% 37% 14% 4 1	270
	21st to end	Day	30% 18% 32% 15% 5%	297
January	1st to 10th	Night	19% 13% 38% 25% 6% 1	950
	11th to 20th	Night	20% 14% 34% 24% 7% 1	950
	21st to end	Night	19% 9% 35% 28% 8% 1	1045
February	1st to 10th	Night	17% 10% 39% 26% 7% 1	944
	11th to 20th	Night	17% 13% 35% 27% 8%	743
	21st to end	Night	20% 12% 37% 28% 3	628
March	1st to 10th	Night	17% 8% 36% 29% 10% 1	760
	11th to 20th	Night	15% 9% 37% 30% 8% 1	760
	21st to end	Night	19% 8% 29% 33% 10% 1	675
April	1st to 10th	Night	22% 7% 33% 30% 6% 2	570
	11th to 20th	Night	23% 6% 28% 29% 13% 1	563
	21st to end	Night	18% 5% 30% 34% 11% 1	570
May	1st to 10th	Night	20% 5% 28% 32% 13% 1	570
	11th to 20th	Night	17% 4 26% 37% 14% 2	561
	21st to end	Night	13% 4 18% 39% 22% 4	617
June	1st to 10th	Night	14% 2 26% 35% 22% 1	570
	11th to 20th	Night	15% 3 21% 37% 20% 3	570
	21st to end	Night	15% 3 20% 36% 24% 2	570
July	1st to 10th	Night	8% 2 14% 42% 30% 3	555
	11th to 20th	Night	11% 2 18% 35% 31% 5%	552
	21st to end	Night	10% 2 18% 40% 26% 5%	624
August	1st to 10th	Night	11% 1 14% 39% 30% 4	567
	11th to 20th	Night	9% 2 16% 34% 32% 7%	564
	21st to end	Night	13% 4 18% 38% 26% 2	627
September	1st to 10th	Night	12% 5% 20% 33% 22% 8%	570
	11th to 20th	Night	15% 5% 19% 34% 22% 6%	702
	21st to end	Night	18% 8% 21% 29% 20% 4	760
October	1st to 10th	Night	21% 9% 25% 25% 18% 2	760
	11th to 20th	Night	27% 11% 28% 24% 10% 1	760
	21st to end	Night	30% 12% 25% 25% 8% 1	836
November	1st to 10th	Night	24% 12% 31% 27% 6%	780
	11th to 20th	Night	25% 18% 32% 20% 5% 1	800
	21st to end	Night	26% 16% 30% 21% 7%	946
December	1st to 10th	Night	25% 17% 33% 19% 6% 1	950
	11th to 20th	Night	24% 15% 35% 18% 7% 2	950
	21st to end	Night	28% 13% 35% 21% 3	1045

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