Upper Gagetown
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Upper Gagetown clear sky chart from 2005-11-06 to 2024-01-27.

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	18% 8% 3 6% 5% 3 5% 4 5% 7% 34%	74771
	Night	19% 9% 4 6% 5% 3 4 4 5% 6% 33%	75273
Transparency	Day	50% 6% 12% 20% 11% 1	74472
	Night	51% 6% 11% 20% 10% 1	75108
Seeing	Day	26% 16% 31% 19% 7% 1	15291
	Night	25% 15% 31% 22% 6%	23299

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	15% 15% 5% 8% 5% 4 4 3 6% 6% 28%	1327
	11th to 20th	Day	19% 14% 5% 8% 6% 3 4 3 4 4 30%	1472
	21st to end	Day	12% 10% 4 6% 4 3 6% 5% 5% 7% 39%	1783
February	1st to 10th	Day	16% 11% 4 6% 5% 4 6% 5% 5% 7% 32%	1620
	11th to 20th	Day	16% 12% 4 6% 6% 4 5% 7% 5% 6% 30%	1573
	21st to end	Day	11% 10% 3 6% 8% 4 5% 5% 5% 6% 37%	1426
March	1st to 10th	Day	16% 13% 5% 8% 6% 3 6% 4 5% 5% 30%	1899
	11th to 20th	Day	15% 10% 4 8% 7% 4 4 4 4 6% 35%	1980
	21st to end	Day	17% 10% 4 8% 6% 3 4 5% 4 6% 33%	2178
April	1st to 10th	Day	21% 13% 4 6% 6% 3 5% 4 6% 6% 27%	2102
	11th to 20th	Day	20% 8% 3 5% 5% 3 4 4 5% 6% 35%	2312
	21st to end	Day	24% 8% 4 6% 5% 3 4 4 5% 5% 32%	2340
May	1st to 10th	Day	22% 9% 3 7% 5% 4 4 5% 5% 6% 30%	2340
	11th to 20th	Day	22% 7% 3 5% 5% 3 4 4 5% 6% 36%	2442
	21st to end	Day	18% 7% 3 6% 6% 3 5% 4 5% 8% 34%	2786
June	1st to 10th	Day	24% 8% 4 7% 5% 4 4 5% 4 7% 29%	2700
	11th to 20th	Day	22% 6% 3 5% 5% 3 4 4 5% 8% 35%	2700
	21st to end	Day	24% 8% 3 5% 5% 4 5% 5% 5% 7% 29%	2700
July	1st to 10th	Day	16% 6% 2 5% 5% 4 5% 6% 6% 8% 36%	2700
	11th to 20th	Day	16% 6% 3 6% 5% 2 5% 5% 8% 10% 35%	2700
	21st to end	Day	15% 6% 3 6% 7% 4 7% 7% 7% 8% 31%	2619
August	1st to 10th	Day	16% 7% 2 6% 6% 3 6% 5% 6% 7% 36%	2327
	11th to 20th	Day	16% 7% 3 7% 7% 4 5% 5% 6% 8% 34%	2304
	21st to end	Day	13% 5% 3 5% 6% 3 5% 4 5% 8% 43%	2574
September	1st to 10th	Day	13% 4 3 4 5% 3 4 5% 6% 9% 45%	2150
	11th to 20th	Day	17% 6% 2 4 4 3 4 4 5% 5% 47%	1980
	21st to end	Day	18% 7% 2 5% 4 2 3 4 4 5% 46%	1980
October	1st to 10th	Day	17% 7% 3 6% 4 3 4 4 5% 8% 40%	1824
	11th to 20th	Day	20% 8% 2 5% 4 2 4 4 5% 7% 38%	1800
	21st to end	Day	22% 8% 3 6% 6% 4 5% 4 5% 6% 32%	1877
November	1st to 10th	Day	21% 8% 3 6% 4 3 4 4 4 6% 36%	1593
	11th to 20th	Day	19% 7% 3 7% 4 4 5% 4 5% 7% 35%	1520
	21st to end	Day	21% 11% 5% 7% 6% 3 4 3 4 4 31%	1520
December	1st to 10th	Day	25% 11% 3 7% 5% 3 5% 3 4 6% 28%	1520
	11th to 20th	Day	20% 13% 4 10% 7% 3 4 3 4 5% 27%	1672
	21st to end	Day	20% 11% 4 7% 6% 3 4 3 4 5% 35%	2431
January	1st to 10th	Night	16% 13% 4 9% 6% 3 4 4 5% 6% 29%	2838
	11th to 20th	Night	18% 12% 5% 8% 6% 3 4 5% 6% 6% 28%	2704
	21st to end	Night	12% 10% 4 7% 6% 4 4 5% 5% 8% 34%	2716
February	1st to 10th	Night	15% 13% 3 6% 5% 4 5% 5% 6% 6% 32%	2340
	11th to 20th	Night	17% 12% 4 8% 7% 3 4 4 6% 6% 29%	2273
	21st to end	Night	14% 11% 5% 7% 6% 4 5% 5% 5% 4 33%	1829
March	1st to 10th	Night	15% 15% 5% 7% 6% 2 4 4 5% 5% 33%	2048
	11th to 20th	Night	18% 10% 4 7% 6% 3 5% 5% 5% 5% 31%	1979
	21st to end	Night	18% 10% 4 9% 6% 3 5% 3 4 5% 34%	2178
April	1st to 10th	Night	24% 12% 3 7% 6% 2 4 4 4 5% 27%	1852
	11th to 20th	Night	23% 8% 2 6% 5% 3 4 4 5% 7% 33%	1598
	21st to end	Night	25% 9% 3 6% 5% 3 4 3 5% 5% 30%	1620
May	1st to 10th	Night	22% 9% 3 6% 6% 3 5% 4 5% 7% 30%	1620
	11th to 20th	Night	26% 8% 4 5% 5% 3 4 4 4 4 32%	1452
	21st to end	Night	17% 9% 4 7% 6% 3 5% 5% 5% 7% 34%	1502
June	1st to 10th	Night	26% 7% 4 6% 5% 3 4 5% 5% 7% 28%	1260
	11th to 20th	Night	21% 7% 3 6% 5% 3 5% 5% 4 6% 36%	1260
	21st to end	Night	27% 8% 2 5% 5% 3 4 5% 4 6% 32%	1260
July	1st to 10th	Night	15% 6% 4 7% 5% 4 5% 5% 7% 6% 36%	1260
	11th to 20th	Night	17% 6% 3 5% 6% 3 6% 5% 6% 10% 34%	1260
	21st to end	Night	18% 7% 3 7% 6% 3 6% 7% 6% 7% 30%	1674
August	1st to 10th	Night	14% 6% 3 6% 5% 3 5% 6% 6% 8% 39%	1612
	11th to 20th	Night	16% 7% 3 6% 6% 3 5% 5% 6% 7% 35%	1596
	21st to end	Night	14% 5% 2 6% 5% 3 4 4 6% 7% 44%	1782
September	1st to 10th	Night	16% 6% 2 5% 5% 2 5% 5% 5% 7% 43%	1807
	11th to 20th	Night	17% 6% 3 4 4 2 3 4 4 7% 45%	1980
	21st to end	Night	19% 5% 2 4 4 3 3 4 5% 6% 44%	1980
October	1st to 10th	Night	18% 7% 3 5% 5% 3 4 4 5% 7% 40%	2135
	11th to 20th	Night	17% 8% 3 6% 5% 4 4 4 5% 6% 38%	2160
	21st to end	Night	23% 9% 4 5% 6% 3 4 4 5% 5% 33%	2475
November	1st to 10th	Night	21% 8% 3 6% 5% 3 5% 3 4 6% 36%	2483
	11th to 20th	Night	19% 8% 4 7% 6% 3 4 4 5% 6% 33%	2660
	21st to end	Night	21% 11% 4 6% 5% 3 4 4 4 6% 31%	2660
December	1st to 10th	Night	26% 10% 4 8% 5% 3 4 3 4 5% 27%	2660
	11th to 20th	Night	25% 10% 4 6% 6% 3 5% 4 4 5% 27%	3524
	21st to end	Night	22% 13% 5% 7% 6% 3 3 3 4 4 31%	5236

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	57% 5% 14% 15% 10% 1	1328
	11th to 20th	Day	59% 5% 8% 18% 8% 1	1472
	21st to end	Day	45% 5% 12% 21% 15% 1	1783
February	1st to 10th	Day	52% 5% 12% 19% 10% 2	1620
	11th to 20th	Day	54% 7% 11% 17% 10% 1	1581
	21st to end	Day	48% 5% 11% 23% 11% 3	1426
March	1st to 10th	Day	57% 4 9% 18% 10% 2	1903
	11th to 20th	Day	52% 4 12% 16% 13% 3	1980
	21st to end	Day	54% 4 8% 19% 11% 4	2178
April	1st to 10th	Day	58% 5% 9% 14% 12% 2	2102
	11th to 20th	Day	49% 5% 10% 21% 13% 1	2312
	21st to end	Day	54% 4 9% 16% 12% 4	2340
May	1st to 10th	Day	54% 6% 8% 18% 11% 2	2340
	11th to 20th	Day	50% 5% 9% 21% 12% 2	2446
	21st to end	Day	49% 7% 12% 22% 10% 1	2786
June	1st to 10th	Day	56% 6% 10% 17% 10%	2700
	11th to 20th	Day	49% 5% 12% 20% 13% 2	2700
	21st to end	Day	55% 7% 11% 16% 10% 1	2700
July	1st to 10th	Day	43% 9% 16% 21% 10% 1	2625
	11th to 20th	Day	43% 9% 15% 22% 10% 1	2619
	21st to end	Day	47% 9% 14% 21% 8%	2472
August	1st to 10th	Day	45% 9% 15% 23% 8%	2314
	11th to 20th	Day	46% 9% 13% 23% 8%	2304
	21st to end	Day	39% 8% 14% 27% 12%	2574
September	1st to 10th	Day	36% 8% 15% 27% 14%	2150
	11th to 20th	Day	39% 6% 10% 26% 16% 2	1980
	21st to end	Day	41% 5% 9% 27% 17% 1	1980
October	1st to 10th	Day	44% 6% 12% 26% 12%	1824
	11th to 20th	Day	46% 6% 14% 26% 8%	1800
	21st to end	Day	53% 5% 11% 19% 12%	1877
November	1st to 10th	Day	50% 4 11% 22% 11% 1	1593
	11th to 20th	Day	49% 5% 15% 17% 14% 1	1520
	21st to end	Day	57% 6% 13% 18% 7%	1520
December	1st to 10th	Day	60% 5% 10% 19% 6% 1	1520
	11th to 20th	Day	61% 4 8% 16% 9% 1	1672
	21st to end	Day	54% 4 13% 17% 10% 2	2431
January	1st to 10th	Night	56% 6% 11% 18% 9% 1	2838
	11th to 20th	Night	56% 7% 10% 17% 8% 1	2704
	21st to end	Night	48% 5% 11% 22% 11% 2	2716
February	1st to 10th	Night	52% 5% 13% 17% 12% 1	2340
	11th to 20th	Night	55% 6% 11% 16% 11% 2	2276
	21st to end	Night	52% 4 10% 19% 12% 2	1829
March	1st to 10th	Night	54% 4 8% 19% 12% 2	2057
	11th to 20th	Night	53% 6% 9% 17% 13% 2	1980
	21st to end	Night	55% 4 8% 19% 13% 3	2178
April	1st to 10th	Night	59% 4 8% 14% 11% 4	1852
	11th to 20th	Night	50% 4 10% 19% 15% 1	1598
	21st to end	Night	55% 5% 9% 16% 12% 2	1620
May	1st to 10th	Night	53% 6% 9% 18% 11% 2	1620
	11th to 20th	Night	55% 4 9% 19% 11% 1	1453
	21st to end	Night	50% 8% 12% 17% 11% 1	1503
June	1st to 10th	Night	55% 8% 10% 18% 8% 1	1260
	11th to 20th	Night	50% 6% 12% 21% 10% 2	1260
	21st to end	Night	55% 6% 12% 18% 8% 1	1260
July	1st to 10th	Night	44% 8% 16% 22% 9%	1225
	11th to 20th	Night	46% 7% 15% 21% 11%	1218
	21st to end	Night	51% 9% 12% 19% 9% 1	1582
August	1st to 10th	Night	42% 9% 16% 25% 9%	1600
	11th to 20th	Night	46% 9% 16% 23% 7%	1596
	21st to end	Night	38% 6% 16% 26% 12% 1	1782
September	1st to 10th	Night	40% 7% 12% 28% 12% 1	1807
	11th to 20th	Night	38% 6% 12% 27% 16% 1	1980
	21st to end	Night	41% 5% 9% 28% 15% 1	1980
October	1st to 10th	Night	44% 5% 11% 26% 15% 1	2135
	11th to 20th	Night	47% 6% 11% 26% 10% 1	2160
	21st to end	Night	53% 5% 11% 18% 11% 1	2475
November	1st to 10th	Night	50% 5% 12% 21% 11% 1	2483
	11th to 20th	Night	50% 6% 13% 19% 10% 1	2660
	21st to end	Night	54% 7% 14% 16% 9%	2660
December	1st to 10th	Night	60% 4 10% 19% 7%	2660
	11th to 20th	Night	60% 4 9% 19% 8%	3525
	21st to end	Night	57% 5% 10% 18% 6% 4	5236

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% 19% 33% 16% 2	180
	11th to 20th	Day	38% 21% 29% 9% 3	180
	21st to end	Day	23% 19% 36% 16% 5% 1	339
February	1st to 10th	Day	31% 15% 34% 17% 3	340
	11th to 20th	Day	28% 24% 32% 13% 2	336
	21st to end	Day	25% 24% 30% 18% 3	322
March	1st to 10th	Day	29% 22% 31% 14% 3	420
	11th to 20th	Day	26% 21% 30% 16% 5% 1	420
	21st to end	Day	31% 21% 26% 15% 5% 2	462
April	1st to 10th	Day	36% 27% 21% 13% 3 1	420
	11th to 20th	Day	31% 22% 28% 13% 5% 1	412
	21st to end	Day	33% 18% 28% 13% 6% 1	420
May	1st to 10th	Day	34% 18% 28% 15% 5% 1	423
	11th to 20th	Day	28% 16% 29% 17% 8% 1	588
	21st to end	Day	25% 17% 35% 16% 6% 1	680
June	1st to 10th	Day	29% 17% 28% 19% 6% 1	630
	11th to 20th	Day	30% 12% 29% 21% 8% 1	630
	21st to end	Day	27% 11% 31% 24% 7% 1	630
July	1st to 10th	Day	22% 10% 37% 20% 10%	620
	11th to 20th	Day	20% 8% 34% 26% 10% 2	618
	21st to end	Day	17% 7% 36% 30% 9% 1	506
August	1st to 10th	Day	16% 9% 39% 26% 9% 2	446
	11th to 20th	Day	20% 9% 29% 28% 11% 2	439
	21st to end	Day	19% 13% 26% 26% 13% 3	495
September	1st to 10th	Day	12% 14% 33% 29% 9% 3	450
	11th to 20th	Day	24% 13% 27% 22% 11% 3	450
	21st to end	Day	20% 16% 34% 16% 10% 5%	450
October	1st to 10th	Day	24% 14% 23% 24% 14% 2	372
	11th to 20th	Day	23% 20% 28% 18% 10% 1	360
	21st to end	Day	28% 18% 34% 15% 5% 1	396
November	1st to 10th	Day	31% 15% 31% 15% 6% 1	365
	11th to 20th	Day	33% 18% 28% 15% 5% 1	370
	21st to end	Day	30% 25% 29% 14% 3	370
December	1st to 10th	Day	34% 16% 31% 15% 3	370
	11th to 20th	Day	38% 24% 27% 8% 2	184
	21st to end	Day	31% 24% 29% 13% 2 1	198
January	1st to 10th	Night	27% 19% 30% 20% 3	850
	11th to 20th	Night	28% 18% 29% 21% 4	781
	21st to end	Night	18% 21% 33% 22% 5%	820
February	1st to 10th	Night	25% 20% 30% 21% 3	720
	11th to 20th	Night	26% 23% 31% 17% 3	703
	21st to end	Night	23% 20% 31% 22% 4	592
March	1st to 10th	Night	26% 17% 35% 21% 2	720
	11th to 20th	Night	24% 18% 32% 20% 5% 1	720
	21st to end	Night	25% 16% 34% 20% 5%	792
April	1st to 10th	Night	33% 18% 30% 17% 3	627
	11th to 20th	Night	28% 16% 34% 17% 5%	534
	21st to end	Night	31% 15% 29% 19% 6%	540
May	1st to 10th	Night	27% 14% 32% 21% 5% 1	540
	11th to 20th	Night	30% 14% 32% 19% 5%	532
	21st to end	Night	20% 19% 37% 21% 4	535
June	1st to 10th	Night	28% 9% 34% 25% 4	360
	11th to 20th	Night	23% 13% 31% 27% 6%	360
	21st to end	Night	31% 6% 29% 29% 4 1	360
July	1st to 10th	Night	19% 6% 40% 29% 6%	350
	11th to 20th	Night	19% 6% 29% 36% 9%	348
	21st to end	Night	21% 7% 33% 32% 8%	516
August	1st to 10th	Night	16% 6% 35% 33% 10% 1	538
	11th to 20th	Night	18% 7% 29% 35% 12%	532
	21st to end	Night	14% 8% 32% 31% 13% 1	594
September	1st to 10th	Night	18% 9% 38% 24% 11% 1	552
	11th to 20th	Night	22% 9% 26% 28% 13% 1	720
	21st to end	Night	22% 12% 30% 26% 10%	720
October	1st to 10th	Night	22% 11% 30% 26% 10% 1	720
	11th to 20th	Night	21% 13% 34% 23% 8% 1	720
	21st to end	Night	28% 19% 32% 17% 4	792
November	1st to 10th	Night	30% 15% 29% 21% 6% 1	776
	11th to 20th	Night	27% 18% 30% 18% 6%	850
	21st to end	Night	28% 20% 30% 19% 3	850
December	1st to 10th	Night	34% 16% 30% 16% 4	850
	11th to 20th	Night	31% 21% 31% 16% 2	850
	21st to end	Night	31% 19% 28% 18% 4	935

Page generated at 2024-01-24 10:37:31. Version ac07

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